@article { ISI:000231197500017, title = {Vanadium-containing ordered mesoporous silicas: synthesis, characterization and catalytic activity in the hydroxylation of biphenyl}, journal = {Applied Catalysis A - General}, volume = {290}, number = {1-2}, year = {2005}, month = {AUG}, pages = {148-158}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

A series of vanadium-containing ordered mesoporous MCM-41 materials (V-OMS) have been synthesized by direct hydrothermal (VMCM-41) and grafting (V/MCM-41) methods using hexadecyl trimethyl ammonium bromide (HDTMABr) as the structure-directing agent. The physico-chemical properties of the vanadium-containing materials were characterized in detail by ICP-OES, XRD, Fr-IR, N-2 adsorption-desorption, DRUV-VIS, TPR, XPS and SEM techniques. The redox performances of the vanadium-modified mesoporous materials were tested in the hydroxylation of biphenyl using aqueous H2O2 (30 wt.\%) as oxidant. For a better exploitation of the catalytic activity, the reaction parameters are optimized in terms of temperature, solvent, oxidant, etc. A comparison between the catalytic activity values of the vanadium-containing mesoporous materials prepared by the two routes shows that vanadium-substituted (V-MCM-41) materials had increased activity and improved selectivity for mono hydroxyl products in the hydroxylation reaction of biphenyl compared to the V/MCM-41 catalysts. The heterogenity of the catalysts was verified by a series of leaching studies. Both the catalysts enhance the leaching of active vanadia species during the reaction; among them, V/MCM-41 shows the least heterogenity. (c) 2005 Elsevier B.V. All rights reserved.

}, keywords = {biphenyl, heterogenity, MCM-41, Mesoporous molecular sieves, Vanadium}, issn = {0926-860X}, doi = {10.1016/j.apcata.2005.05.012}, author = {George, J. and Shylesh, S and Singh, AP} } @article { ISI:000230768400012, title = {Vanadium-containing ordered mesoporous silicates: does the silica source really affect the catalytic activity, structural stability, and nature of vanadium sites in V-MCM-41?}, journal = {Journal of Catalysis}, volume = {233}, number = {2}, year = {2005}, month = {JUL}, pages = {359-371}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, type = {Article}, address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA}, abstract = {

A series of vanadium-substituted mesoporous materials were synthesized hydrothermally with the use of two commonly used silica Sources. fumed silica and tetra ethyl orthosilicate. The extent of mesopore structural ordering was confirmed from X-ray diffraction, N-2 physisorption, SEM, and TEM, and the presence and nature of vanadium species inside the framework of the MCM-41 matrix was confirmed in detail with the use of various characterization techniques like FT-IR, Si-29 MAS NMR, DRUV-vis, EPR, V-51 MAS NMR, and Raman analysis. It is deduced from the above characterization techniques that, regardless of the silica source, vanadium is incorporated into the silica framework and thereby increases the structural ordering and wall thickness of the mesoporous material. Thermal and hydrothermal Studies performed over the V-MCM-41 catalysts show that the Si-O-Si inorganic backbone from a fumed silica source is more resistant to severe thermal treatments and hydrolysis than the tetraethyl orthosilicate-synthesized catalysts. Spectroscopic characterization reveals the existence of easily accessible isolated tetrahedral vanadium sites on V-MCM-41 catalyst prepared front fumed silica catalyst, whereas the sample obtained from a tetraethyl orthosilicate silica Source shows vanadium in more disordered sites. Catalytic results show that both catalysts display excellent activity toward the epoxidation reaction of bulkier olefins, and the exceptional activity of the fumed silica catalyst may arise from the more isolated tetrahedral sites and the complementary textural characteristics, which may facilitate the easy access of substrate to the isolated framework metal sites. (c) 2005 Elsevier Inc. All rights reserved.

}, keywords = {epoxidation, fumed silica, MCM-41, tetraethyl orthosilicate, Vanadium}, issn = {0021-9517}, doi = {10.1016/j.jcat.2005.05.001}, author = {Shylesh, S and Singh, AP} } @article { ISI:000229488700008, title = {Vapor phase oxidation of 4-fluorotoluene over vanadia-titania catalyst}, journal = {Journal of Molecular Catalysis A - Chemical}, volume = {234}, number = {1-2}, year = {2005}, month = {JUN}, pages = {51-57}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The vapor phase oxidation of 4-fluorotoluene has been carried out over vanadia-titania catalysts with moderate conversion and selectivity for 4-fluorobenzaldehyde. Two series of V2O5/TiO2 catalysts with 1-10 mol\% vanadia were prepared by sol-gel technique using vanadium and titanium peroxide as vanadia and titania precursors respectively and by impregnation technique using vanadium peroxide on anatase titania support. The samples were characterized by X-ray diffraction, NH3-TPD, FT-IR and BET surface area measurements. The XRD of the catalysts prepared by impregnation technique showed retention of the anatase titania whereas the catalysts prepared by sol-gel technique showed the formation of rutile titania with minor amount of anatase phase at lower vanadia content (1-3 \%), which completely transformed into anatase phase at higher vanadia loading. The samples prepared by sol-gel method showed higher acidity and surface area compared to the samples prepared by impregnation. Pyridine adsorption study by FT-IR revealed the presence of Lewis acidity at lower vanadia loading (1-3 \%) and presence of both Lewis as well as Bronsted acidity at higher vanadia loading. The catalytic activity for oxidation of 4-fluorotoluene increased with vanadia loading in the sol-gel catalysts. The catalysts prepared by impregnation technique were found to be less active. However the selectivity for 4-fluorobenzaldehyde decreased with increase in vanadia content. The influence of vanadia loading, reaction temperature and contact time on the catalytic activity for 4-fluorotoluene oxidation has been investigated. The structure of the catalyst and its catalytic activity has been correlated. (c) 2005 Elsevier B.V. All rights reserved.

}, keywords = {Catalyst, fluorotoluene, Oxidation, vanadia-titania, vapor phase}, issn = {1381-1169}, doi = {10.1016/j.molcata.2005.02.020}, author = {Maurya, S. K. and Patil, P. and Shubhangi B. Umbarkar and Gurjar, M. K. and Dongare, Mohan K. and Rudiger, S. and Kemnitz, E.} } @article { ISI:000226929600009, title = {Vapour phase oxidation of acetophenone to benzoic acid over binary oxides of V and Mo}, journal = {Chemical Engineering Research and Design}, volume = {83}, number = {A1}, year = {2005}, month = {JAN}, pages = {75-80}, publisher = {INST CHEMICAL ENGINEERS}, type = {Article}, address = {165-189 RAILWAY TERRACE, DAVIS BLDG, RUGBY CV21 3HQ, ENGLAND}, abstract = {

Test data for catalytic oxidation of acetophenone into benzoic acid performed at bench scale with V2O5-MoO3 catalyst in a continuous downflow metal reactor are presented. The process parameters such as temperature and flow rate influence the product distribution. The P2O5, B2O3 and Na2O when used as dopant on V2O5-MoO3 catalyst showed marked influence on activity and selectivity. An acidic catalyst like V2O5-MoO3-P2O5 favours formation of benzoic acid while a basic catalyst like V2O5-MoO3-Na2O favours formation of benzaldehyde. The addition of Na2O into V2O5-MoO3 binary oxides formed new phases (NaVMoO6 and Na2V2Mo3O15), which increased Arrhenius activation energy from 18.24 to 31.35 kcal mol(-1).

}, keywords = {acetophenone, activity, benzoic acid, carbon oxides, oxidation of acetophenone, selectivity}, issn = {0263-8762}, doi = {10.1205/cherd.03206}, author = {Chumbhale, Vilas R. and Paradhy, S. A. and Anilkumar, Mettu and Kadam, S. T. and Bokade, Vijay V.} } @article { ISI:000240279200017, title = {Vanadium-containing ethane-silica hybrid periodic mesoporous organosilicas: synthesis, structural characterization and catalytic applications}, journal = {Microporous and Mesoporous Materials}, volume = {94}, number = {1-3}, year = {2006}, month = {SEP}, pages = {127-138}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Vanadium-containing ethane-silica hybrid mesoporous silsesquioxane materials (V-HMM) with uniform hexagonal arrangement were prepared using C-18-, C-16- and C-14-alkyl trimethyl ammonium (ATMA) surfactants under basic conditions. The materials were characterized by PXRD, N-2 adsorption-desorption, UV-Visible spectroscopy, Raman, Si-29, C-13 and V-51 solid-state MAS NMR, TEM and SEM techniques. The characterization techniques revealed that the structural ordering, morphology as well as the percentage of metal incorporation depends strongly on the hydrophobic chain length of the surfactant. PXRD, electron microscopy and N-2 adsorptiondesorption analysis confirmed that the original hexagonal structure of the material is maintained after vanadium substitution. UV-Visible, V-51 NMR and Raman analysis certified that vanadium exists in a highly dispersed state and had tetrahedral coordination with the support surface. Liquid-phase epoxidation reaction of styrene using aqueous H2O2 and TBHP as oxidants, showed that the hybrid materials were highly active and more stable than conventional vanadosilicates. The high catalytic activity and improved epoxide selectivity of the V-HMM samples is related to the more hydrophobic environment inside the pore channels than the silica channels in V-MCM-41. (c) 2006 Elsevier Inc. All rights reserved.

}, keywords = {epoxidation, organo vanadosilicates, styrene, V-HMM, V-MCM-41}, issn = {1387-1811}, doi = {10.1016/j.micromeso.2006.03.027}, author = {Shylesh, S. and Singh, A. P.} } @article { ISI:000241996500012, title = {Vapour phase methylation of phenol over nanocrystalline ZnFe(2-x)A1(x)O(4) (x=0, 0.25, 0.5, 0.75 and 1.0) ferrospinel system}, journal = {Indian Journal of Chemical Technology}, volume = {13}, number = {5}, year = {2006}, month = {SEP}, pages = {493-498}, publisher = {NATL INST SCIENCE COMMUNICATION}, type = {Article}, address = {DR K S KRISHNAN MARG, NEW DELHI 110 012, INDIA}, abstract = {

The alkylation ofphenol with methanol was carried out over ZnFe2-xAlxO4 (x = 0, 0.25, 0.5, 0.75 and 1.0) type spinel systems in a Fixed bed, down flow reactor. The influence of Surface acidity, cation distribution in the spinel lattice and various reaction parameters are discussed. A maximum yield of 70.9 and 22.9\% with selectivity of 73.5 and 23.3\% was obtained for 2,6-xylenol and o-cresol respectively, giving a total ortho selectivity of: 96.8\% over ZnFeAlO4 at 350 degrees C, methanol to phenol molar ratio of 5 and WHSV of 0.6 h(-1). Catalyst characterization was made by XRD, Mossbauer spectroscopy, ammonia desorption and BET surface area measurements. Mossbauer spectroscopy reveals isomorphic substitution or Fe 3 by smaller A 13, into the octahedral sites leading to lattice distortion, Unsymmetrical charge distribution and charge transfer from iron to oxygen making it more basic and proton attracting. This helps vertical adsorption ofphenol and formation of 2.6-xylenol. It has been concluded that catalyst acidity plays major role in the reaction as compared to surface area.

}, keywords = {consecutive methylation, ferrospinels, vertical and horizontal adsorption}, issn = {0971-457X}, author = {Reddy, Vanga S. and RadheShyam, A. and Dwivedi, Reena and Rai, A. and Anilkumar, Mettu and Chumbhale, Vilas R. and Aswar, A. S. and Prasad, R.} } @article { ISI:000241854900005, title = {Viscoelastic and dielectric behavior of poly(1-butene)/multiwalled carbon nanotube nanocomposites}, journal = {Journal of Macromolecular Science Part B-Physics}, volume = {45}, number = {6}, year = {2006}, month = {NOV}, pages = {1053-1064}, publisher = {TAYLOR \& FRANCIS INC}, type = {Article}, address = {325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA}, abstract = {

Linear viscoelastic properties and dielectric behavior of poly(1-butene)/multiwalled carbon nanotube (MWCNT) nanocomposites were investigated. Dynamic mechanical analysis showed significant increase in storage modulus in the rubbery regime. The tan delta peak temperature remained constant; however, the peak intensity was lowered for the nanocomposites. In melt rheological studies the nanocomposites showed a shift in crossover frequency to the lower side, suggesting delayed relaxation of the molecular chains in the presence of MWCNT and this shift was found to depend on the content of MWCNT. The dielectric constant increased from 2.2 to 70 for the nanocomposite with 7 wt. \% MWCNT. The electrical conductivity increased significantly, from 10(-15) to 10(-3) S/cm. The results of rheology and dielectric studies indicate that a percolation network is formed that is responsible for the observed changes.

}, keywords = {Dielectric, MWCNT, poly(1-butene), viscoelastic}, issn = {0022-2348}, doi = {10.1080/00222340600929691}, author = {Wanjale, Santosh D. and Jog, Jyoti Prakash} } @article { ISI:000243169700040, title = {Vishnu Ganesh Bhide (1940-2006)}, journal = {Current Science}, volume = {91}, number = {11}, year = {2006}, month = {DEC}, pages = {1574-1575}, publisher = {CURRENT SCIENCE ASSN}, type = {Bibliographical-Item}, address = {C V RAMAN AVENUE, PO BOX 8005, BANGALORE 560 080, INDIA}, issn = {0011-3891}, author = {Ogale, Satish and Date, Sadgopal K.} } @article { ISI:000244008300031, title = {Varistors based on Ta-doped TiO2}, journal = {Ceramics International}, volume = {33}, number = {2}, year = {2007}, month = {MAR}, pages = {301-303}, publisher = {ELSEVIER SCI LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

The nonlinear current (I)-voltage (V) characteristics of titanium dioxide are examined when doped with small quantities (0.05-0.5 at.\%) of tantalum pentaoxide. For optimum compositions, the nonlinear coefficients are found to be in the range of 25-30 and the breakdown field strength (EB) is similar to 4000 V/cm. The obtained alpha- and E-B-values are higher than the previously reported values for TiO2 ceramics. The acceptor like surface states at the grain boundary adsorb oxygen during sintering and cooling, leading to formation of grain boundary barrier. The grain boundary barrier height (OB) is calculated using Schottky equation. (c) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

}, keywords = {Ceramics, Oxides, Schottky barrier, TiO2, varistor}, issn = {0272-8842}, doi = {10.1016/j.ceramint.2005.07.026}, author = {Navale, S. C. and Murugan, A. Vadivel and Ravi, V.} } @article {42611, title = {Velocity correlations in dense granular flows observed with internal imaging}, journal = {Physical Review Letters}, volume = {98}, year = {2007}, month = {JUN}, pages = {238001}, type = {Article}, abstract = {

We show that the velocity correlations in uniform dense granular flows inside a silo are similar to the hydrodynamic response of an elastic hard-sphere liquid. The measurements are made using a fluorescent refractive-index-matched interstitial fluid in a regime where the flow is dominated by grains in enduring contact and fluctuations scale with the distance traveled, independent of flow rate. The velocity autocorrelation function of the grains in the bulk shows a negative correlation at short time and slow oscillatory decay to zero similar to simple liquids. Weak spatial velocity correlations are observed over several grain diameters. The mean square displacements show an inflection point indicative of caging dynamics. The observed correlations are qualitatively different at the boundaries.

}, doi = {10.1103/PhysRevLett.98.238001}, author = {Orpe, Ashish V. and Kudrolli, Arshad} } @article { ISI:000251868800001, title = {Versatile method for the preparation of conjugates of peptides with DNA/PNA/analog by employing chemo-selective click reaction in water}, journal = {Nucleic Acids Research}, volume = {35}, number = {21}, year = {2007}, month = {DEC}, pages = {e139}, publisher = {OXFORD UNIV PRESS}, type = {Article}, address = {GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND}, abstract = {

The specific 1,3 dipolar Hisgen cycloaddition reaction known as {\textquoteleft}click-reaction{\textquoteright} between azide and alkyne groups is employed for the synthesis of peptideoligonucleotide conjugates. The peptide nucleic acids (PNA)/DNA and peptides may be appended either by azide or alkyne groups. The cycloaddition reaction between the azide and alkyne appended substrates allows the synthesis of the desired conjugates in high purity and yields irrespective of the sequence and functional groups on either of the two substrates. The versatile approach could also be employed to generate the conjugates of peptides with thioacetamido nucleic acid (TANA) analog. The click reaction is catalyzed by Cu (I) in either water or in organic medium. In water, similar to 3-fold excess of the peptide-alkyne/azide drives the reaction to completion in 2 h with no side products.

}, issn = {0305-1048}, doi = {10.1093/nar/gkm935}, author = {Gogoi, Khirud and Mane, Meenakshi V. and Kunte, Sunita S. and Kumar, Vaijayanti A.} } @article { ISI:000261555200036, title = {Valence-state analysis through spectroelectrochemistry in a series of quinonoid-bridged diruthenium complexes [(acac)(2)Ru(mu-L)Ru(acac)(2)](n) (n =+2,+1, 0,-1,-2)}, journal = {Chemistry-A European Journal}, volume = {14}, number = {34}, year = {2008}, month = {OCT}, pages = {10816-10828}, publisher = {WILEY-BLACKWELL}, type = {Article}, address = {COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA}, abstract = {

The quinonoid ligand-bridged diruthenium compounds [(acac)(2)Ru(mu-L2-)Ru(acac)(2)] (acac(-) = acetylacetonato = 2,4-pentanedionato; L2- = 2,5-dioxido-1,4-benzoquinone, 1; 3,6-dichloro-2,5-dioxido-1,4-benzoquinone, 2; 5,8-dioxido-1,4-naphthoquinone, 3; 2-3-dichloro-5,8-dioxido-1,4-naphthoquinone, 4; 1,5-dioxido-9,10-anthraquinone, 5; and 1,5-diimido-9,10-anthraquinone, 6) were prepared and characterized analytically. The crystal structure analysis of 5 in the rac configuration reveals two tris(2,4-pentanedionato)ruthenium moieties with an extended anthracenedione-derived bis(ketoenolatee) pi-conjugated bridging ligand. The weakly antiferro-magnetically coupled {Ru-III(mu-L2-)Ru{\textendash}(III)} configuration in 1-6 exhibits complicated overall magnetic and EPR responses,. ne simultaneous presence of highly redox-active quinonoid-bridging ligands and of two ruthenium centers capable of adopting the oxidation states +2, +3, and +4 creates a large variety of possible oxidation state combinations. Accordingly. the complexes 1-6 exhibit two reversible one-electron oxidation steps and at least two reversible reduction processes. Shifts to positive potentials were observed on introduction of Cl substituents (1 -\> 2, 3 -\> 4) or through replacement of NH by O (6 -\> 5). The ligand-to-metal charge transfer (LMCT) absorptions in the visible region of the neutral molecules become more intense and shifted to lower energies on stepwise reduction with two electrons. On oxidation, the para-substituted systems 1-4 exhibit monocation intermediates with intervalence charge transfer (IVCT) transitions of (RuRuIV)-Ru-III mixed-valent species. In contrast, the differently substituted systems 5 and 6 show no such near infrared (NIR) absorption. While the first reduction steps are thus assigned to largely ligand-centered processes, the oxidation appears to involve metal-ligand delocalized molecular orbitals with variable degrees of mixing.

}, keywords = {magnetic properties, quinones, ruthenium, spectroelectrochemistry, structure elucidation, valence-state distributions}, issn = {0947-6539}, doi = {10.1002/chem.200800976}, author = {Ghumaan, Sandeep and Sarkar, Biprajit and Maji, Somnath and Puranik, Vedavati G. and Fiedler, Jan and Urbanos, Francisco A. and Jimenez-Aparicio, Reyes and Kaim, Wolfgang and Lahiri, Goutam Kumar} } @article { ISI:000255798800008, title = {Van der waals and polar intermolecular contact distances: quantifying supramolecular synthons}, journal = {Chemistry-an Asian Journal}, volume = {3}, number = {5}, year = {2008}, month = {APR}, pages = {868-880}, publisher = {WILEY-V C H VERLAG GMBH}, type = {Article}, address = {PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY}, abstract = {

Crystal structures are viewed as being determined by ranges and constraints on interatomic contact distances between neighboring molecules. These distances are considered to arise from environment-dependent atomic sizes, that is, larger sizes for isotropic, van der Waals type contacts and smaller sizes for more-polar, possibly ionic contacts. Although the idea of different, or anisotropic, radii for atoms is not new, we developed a method of obtaining atomic sizes that is based on a theoretical framework. Using different atomic sizes for the same atom in different environments, we were able to rationalize some structural observations and anomalies. For example, benzene with the Pbca structure may be described in terms of two types of C center dot center dot center dot H interactions: a longer contact largely of the van der Waals type, and a shorter, structure-determining type (C delta-center dot center dot center dot H delta+), which we term {\textquoteleft}{\textquoteleft}n-polar{\textquoteright}{\textquoteright}. Our approach is illustrated with three examples: 1) the equivalence in crystal packing of fluorobenzene, benzonitrile, pyridine N-oxide, and pyridine/HF 1:1 molecular complex, all of which take the not-so-common tetragonal P4(1)2(1)2 space group and are practically isomorphous; 2) the similarity of the Pa3 acetylene and Pbca benzene crystal structures; and 3) the equivalence between an increase in pressure and an increase in the {\textquoteleft}{\textquoteleft}n-polar{\textquoteright}{\textquoteright} contacts in Pbca benzene; in other words, the equivalence between hydrostatic pressure and chemical pressure. In the context of crystal engineering, we describe a method whereby the topological information conveyed in a supramolecular synthon is recast in a more quantitative manner. A particular synthon, and in turn the crystal structure to which it leads, is viable within small ranges of distances of its constituent atoms, and these distances are determined by chemical factors.

}, keywords = {atomic radii, benzene crystal, engineering, supramolecular chemistry, van der Waals radii}, issn = {1861-4728}, doi = {10.1002/asia.200700343}, author = {Ganguly, Parthasarathy and Desiraju, Gautam R.} } @conference { ISI:000257237400015, title = {Variability among vitis vinifera cultivars to in vitro propagation}, booktitle = {Proceedings of the International Symposium on Grape Production and Processing}, series = {ACTA HORTICULTURAE}, number = {785}, year = {2008}, note = {International Symposium on Grape Production and Processing, Baramati, INDIA, FEB 06-11, 2006}, month = {MAY}, pages = {127-139}, publisher = {Agr \& Processed Food Prod Export Dev Author; Indian Farmers Fertilizer Cooperat Ltd; Maharashtra Agro Industries Dev Corp Ltd; Indian Council Agr Res; Natl Res Ctr Grapes; Federat Indian Chambers Commerce \& Ind; Natl Hort Board; Minist Food Proc Industrie}, organization = {Agr \& Processed Food Prod Export Dev Author; Indian Farmers Fertilizer Cooperat Ltd; Maharashtra Agro Industries Dev Corp Ltd; Indian Council Agr Res; Natl Res Ctr Grapes; Federat Indian Chambers Commerce \& Ind; Natl Hort Board; Minist Food Proc Industrie}, address = {Po Box 500, 3001 Leuven 1, Belgium}, abstract = {

Response of grapevines to tissue culture has been reported to be genotype dependent, hence it becomes imperative to optimize culture conditions for newly developed varieties or cultivars, needing a large scale planting but availability of sufficient planting stock is a constraint. In the present study, conditions for in vitro propagation of six popular table grape cultivars have been standardized. Single node stem segments of cultivars 2A-Clone of Thompson Seedless, Red Globe, Crimson Seedless, Thompson Seedless, Flame Seedless and Italia cultured on ten different basal media showed varied percentages of bud break and morphogenetic responses. The percentage of bud break varied among the six cultivars. Direct rooting at basal ends of single node segments was observed in all the cultivars except in Italia. Woody plant medium induced the highest response and Eriksson medium the least in all the cultivars tested. Rooted nodal segments with shoots in axils could be established into whole plants on potting. Six cultivars showed different optimum concentrations of growth regulators for induction of maximum number of multiple shoots in both primary as well as secondary nodal segments. Shoot proliferation could be enhanced by several fold in the majority of cultivars on culture of initial shoot clumps to glass bottles instead of culture tubes. Six cultivars showed significant differences in optimum requirement of nutrients and growth regulators for shoot elongation, in vitro and ex vitro rooting and survival rate. Tissue culture plants of all the six cultivars could establish successfully in a greenhouse.

}, keywords = {basal media, Grapevine, growth regulators, micropropagation, Tissue culture, Vitis}, isbn = {978-90-6605-268-0}, issn = {0567-7572}, author = {Barreto, M. S. and Nookaraju, A. and Joglekar, A. M. and Karibasappa, G. S. and Agrawal, Dinesh C.}, editor = {Adsule, P. G. and Sawant, I. S. and Shikhamany, S. D.} } @article { ISI:000260483400085, title = {Varistor property of SnO2 center dot CoO center dot Ta2O5 ceramic modified by barium and strontium}, journal = {Journal of Alloys and Compounds}, volume = {466}, number = {1-2}, year = {2008}, month = {OCT}, pages = {483-487}, publisher = {ELSEVIER SCIENCE SA}, type = {Article}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

The influence of an alkali earth (Ba/Sr) element in small quantities (\< 1 at.\%) on non-linear electrical properties of 98.5\% SnO2 + 1\% CoO + 0.5\% Ta2O5 (all in at.\%) varistor system has been investigated. The non-linear coefficient increases from 33 to 52 whereas breakdown field strength varies 5025-6050 V cm(-1) for the barium-doped samples. In case of strontium-doped specimens moderate increase in non-linear coefficient but significant increase in breakdown field is observed. It is proposed that due to ionic size misfit, Ba and Sr segregates to grain boundaries thereby modifying their barrier properties. The contribution from grain boundary phase to the electrical property is confirmed by the impedance analysis. (C) 2007 Elsevier B.V. All rights reserved.

}, keywords = {Oxide materials, scanning electron microscopy, Sintering}, issn = {0925-8388}, doi = {10.1016/j.jallcom.2007.11.062}, author = {Dhage, S. R. and Ravi, V. and Yang, O. B.} } @article { ISI:000261711400013, title = {Vitamin K-3 family members - Part II: Single crystal X-ray structures, temperature-induced packing polymorphism, magneto-structural correlations and probable anti-oncogenic candidature}, journal = {Journal of Molecular Structure}, volume = {892}, number = {1-3}, year = {2008}, month = {DEC}, pages = {74-83}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Temperature-induced packing polymorphism is observed for vitamin K-3 (menadione, 3-methyl-1,4-naphthoquinone, 1). Form la crystallizes at 300 K and 1b at 277 K both in the same space group P2(1)/c. Form 1b contains one molecule per asymmetric unit, performing anisotropy in g-factor viz. g(z) = 2.0082, g(y) = 2.0055 and g(x) = 2.0025, whereas form 1a contains two molecules in its asymmetric unit. Vitamin K-3 family members 2, [2-hydroxy vitamin K-3] and 3, [2-hydroxy-1-oximino vitamin K-3] also perform intrinsic neutral active naphthosemiquinone valence tautomers even in dark having spin concentrations due to hydrogen bonding and aromatic stacking interactions which are compared to vitamin K-3. The significant lateral C-H center dot center dot center dot O and O-H center dot center dot center dot pi bifurcated or pi-pi(center dot) interactions are discussed for molecular associations and radical formations. X-ray structure of 3 revealed pi-pi(center dot) stack dimers as radicals signatured in PR as triplet with five hyperfine splits [(A) over bar(N-14) = 11.9 G]. The centrosymmetric biradicals in 3 show diamagnetism at high temperature but below 10 K it shows paramagnetism with mu(eff) as 0.19 B.M. Vitamin K-3 and its family members inhibit biological activities of acid phosphatase (APase), which are proportional to their spin concentrations. This may relate to their probable anti-oncogenic candidature in future. (C) 2008 Elsevier B.V. All rights reserved.

}, keywords = {Anti-oncogenic candidature, H-bonding, Magneto-structural correlations, Naphthosemiquinones in vitamin K-3 family, Packing polymorphism, Spin concentrations}, issn = {0022-2860}, doi = {10.1016/j.molstruc.2008.05.015}, author = {Rane, Sandhya and Ahmed, Khursheed and Salunke-Gawali, Sunita and Zaware, Santosh B. and Srinivas, D. and Gonnade, Rajesh G. and Bhadbhade, Mohan M.} } @article { ISI:000268215200019, title = {Vapour sensing with conductive polymer nanocomposites (CPC): polycarbonate-carbon nanotubes transducers with hierarchical structure processed by spray layer by layer}, journal = {Sensors and Actuators B-Chemical}, volume = {140}, number = {2}, year = {2009}, month = {JUL}, pages = {451-460}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

The development of conductive polymer nanocomposite (CPC) sensors for volatile organic compounds (VOC) detection has been carried out using a spray layer by layer (LbL) process. This technique was successfully used to hierarchically structure polycarbonate-multiwall carbon nanotubes (PC-CNT) solutions into a double percolated architecture as attested by atomic force microscopy (AFM) and optical microscopy (OM). PC-CNT vapour sensing behaviour was investigated as a function of CNT content, films thickness, vapour flow and vapours solubility parameter. The response ranking A(r)(toluene)\>A(r)(methanol)\>A(r)(water)of PC-CNT was found to be coherent with kappa(12) Flory-Huggins interaction parameters provided that signals are normalised by analyte molecules number. Signals shape was interpreted to the light of Langmuir-Henry-Clustering (LHC) model and found to be proportional to vapour content. (C) 2009 Elsevier B.V. All rights reserved.

}, keywords = {Atomic force microscopy, carbon nanotube, Chemo-electrical behaviour, Conductive polymer nanocomposite, Vapour Sensing, Volatile organic compounds}, issn = {0925-4005}, doi = {10.1016/j.snb.2009.05.006}, author = {Lu, Jianbo and Kumar, Bijandra and Castro, Mickael and Feller, Jean-Francois} } @article { ISI:000264434000008, title = {Variation in acid moiety of polybenzimidazoles: investigation of physico-chemical properties towards their applicability as proton exchange and gas separation membrane materials}, journal = {Polymer}, volume = {50}, number = {6}, year = {2009}, month = {MAR}, pages = {1403-1413}, publisher = {ELSEVIER SCI LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

A series of polybenzimidazoles (PBIs) were prepared from 3,3{\textquoteright}-diaminobenzidine (DAB) and substituted aromatic dicarboxylic acids. Effects of added polarity, bulk and isomerism in the dicarboxylic acid moiety on the properties of formed aromatic polybenzimidazoles were investigated. Solution polycondensation procedure was optimized for individual case of PBI synthesis in order to obtain inherent viscosity of \>= 1 dL/g. Analysis of physical properties, water uptake, acid doping (H(3)PO(4) and H(2)SO(4)) and gas permeability was performed. All these PBIs exhibited high thermal stability, good solvent solubility and amorphous nature. The uptake of H(3)PO(4) varied from 9 to 20.1 moles per repeat unit (mol/RU), H(2)SO(4) uptake varied from 3.39 to 3.81 mol/RU, while water uptake varied from 1.8 to 3.6 mol/RU of PBI. The dibromoterephthalic acid and tert-butylisophthalic acid based PBI showed the highest H(3)PO(4) uptake in the series, while tert-butylisophthalic acid based PBI exhibited the highest water uptake. Acid uptake was correlated with swelling of the PBI matrix, while density estimation of H(3)PO(4)-doped PBI by He gas expansion method could be correlated to the physical state of PBI. 5-tert-Butylisophthalic acid and 4,4{\textquoteright}-(hexafluoroisopropylidene)bis(benzoic acid) based PBI exhibited higher H(2) and O(2) permeability than other PBIs. The ideal gas selectivity for O(2)/H(2) was considerably higher for most of the PBIs than conventional gas separation membrane materials. These analyses suggested that some of these PBIs have a potential to be used as a PEM or gas separation membrane material. (C) 2009 Elsevier Ltd. All rights reserved.

}, keywords = {Gas permeability, Polybenzimidazole, Proton exchange membrane}, issn = {0032-3861}, doi = {10.1016/j.polymer.2009.01.043}, author = {Kumbharkar, S. C. and Islam, Md. Nazrul and Potrekar, R. A. and Kharul, Ulhas K.} } @article { ISI:000263021000003, title = {Vinyl-2-pyrrolidone derivatized guar gum based aqueous two-phase system}, journal = {Separation and Purification Technology}, volume = {65}, number = {1, SI}, year = {2009}, month = {FEB}, pages = {9-13}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Aqueous two-phase systems (ATPs) are formed when certain combinations of two polymers or polymer and salt are added to water. Phase separation occurs at certain specific concentrations that have similar densities and low interfacial tensions. The present study involves synthesis and application of a novel derivatized guar in aqueous two-phase system. The derivation of guar gum was performed by grafting of 1-vinyl-2-pyrrolidone by a redox reaction in aqueous medium ceric ammonium nitrate (CAN) and potassium Peroxydisulfate(K2S2O8). The ratio of grafting efficiency (\%GE) and ratio of grafting (\%G) was 56\% and 70.1\% respectively. The grafted copolymers were characterized for percent yield and FTIR absorbance. A new aqueous two-phase extraction protocol was established using a mixture of derivatized guar and dextran. A phase diagram was constructed based on the phase separation exhibited by the system at 25 degrees C. The partition coefficient was determined for standard bovine serum albumin (BSA), lactate oxidase (LO) and phytase. The partitioning coefficients were 0.479, 1.981, and 2.586 respectively in the Dextran (2 mill ion)/V-GG/H2O system. The influence of an ionic salt sodium chloride (NaCl) was investigated on the partitioning of BSA. (C) 2008 Elsevier B.V. All rights reserved.

}, keywords = {Aqueous two phase, graft copolymers, Guar gum, Partition coefficient (K), Phase diagram, Vinyl pyrrolidone, viscosity}, issn = {1383-5866}, doi = {10.1016/j.seppur.2008.03.020}, author = {Kautharapu, Kumar and Pujari, Narahari S. and Golegaonkar, Sandeep B. and Ponrathnam, Surendra and Nene, Sanjay N. and Bhatnagar, D.} } @article { ISI:000264558200004, title = {Visible light induced photoreduction of methyl orange by N-doped mesoporous titania}, journal = {Applied Catalysis A-General}, volume = {357}, number = {1}, year = {2009}, month = {MAR}, pages = {26-33}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

N-doped mesoporous titania was synthesized using templating method. Biopolymer chitosan was used as a template and also as a nitrogen source along with ammonium hydroxide. Three different types of N-doped mesoporous titania were synthesized by varying composition of chitosan and titania precursor. These photocatalysts were characterized using XRD, BET-SA, FTIR, UV-DRS, SEM-EDX and XPS analysis. The photocatalytic activity of mesoporous titania was studied by methyl orange (MO) photoreduction reaction. From the experimental results it was observed that the N-doped mesoporous titania (1:2) gives the highest photocatalytic reduction of MO as compared to N-doped mesoporous titania prepared with (1:1) and (1:3) stoichiometry. This could be due to the optimal level of {\textquoteleft}N{\textquoteright} incorporation in the N-doped mesoporous titania (1:2). Photocatalysts reduce the MO dye into derivative of hydrazine. Photoactivity of N-doped mesoporous titania (1:2) is 1.0721 mg of MO reduced per g of TiO2 vis-a-vis 0.508 mg of MO reduced per g of TiO2 for Degussa P25 photocatalyst. The effect of various operating parameters like photocatalyst loading. initial concentration and intensity of light also has been studied. (C) 2009 Elsevier B.V. All rights reserved.

}, keywords = {biopolymer, Chitosan, MO photoreduction, N-doped mesoporous titania, Visible active photocatalyst}, issn = {0926-860X}, doi = {10.1016/j.apcata.2008.12.030}, author = {Joshi, Meenal M. and Labhsetwar, Nitin K. and Mangrulkar, Priti A. and Tijare, Saumitra N. and Kamble, Sanjay P. and Rayalu, Sadhana S.} } @article { ISI:000262449000038, title = {VLS-like growth and characterizations of dense ZnO nanorods grown by e-beam process}, journal = {Journal of Physics D-Applied Physics}, volume = {42}, number = {3}, year = {2009}, month = {FEB}, pages = {035310}, publisher = {IOP PUBLISHING LTD}, address = {DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND}, abstract = {

We present a new approach to produce ZnO nanorods in a reproducible manner at a temperature lower than other physical vapour deposition techniques, such as the vapour-liquid-solid mechanism. Arrays of well-aligned ZnO nanorods of uniform diameter have been synthesized on the Si substrate precoated with Au, using a simple electron beam evaporation method without the flow of any carrier gas. Scanning electron microscopy and atomic force microscopy characterizations show that as-grown nanorods are well aligned and uniform in diameter. X-ray diffraction measurements and clear lattice fringes in high-resolution transmission electron microscopy image show the growth of good quality polycrystalline hexagonal ZnO nanorods and a \< 0 0 2 \> growth direction. The polarization-dependent studies of near edge x-ray absorption fine structure (NEXAFS) are performed to investigate the electronic structure of the zinc and oxygen ions. The analysis of NEXAFS spectra at different angles of incidence of photon flux indicates the formation of ZnO nanorods having anisotropic behaviour of O and Zn states. The photoluminescence spectrum exhibits strong ultraviolet emission at 385 nm and the UV-visible spectrum also shows a band-gap transition around 390 nm indicating the good quality of nanorods. The catalytic growth mechanism of the ZnO nanorods is discussed on the basis of experimental results in this work.

}, issn = {0022-3727}, doi = {10.1088/0022-3727/42/3/035310}, author = {Agarwal, Dinesh C. and Chauhan, R. S. and Avasthi, D. K. and Sulania, I. and Kabiraj, D. and Thakur, P. and Chae, K. H. and Chawla, Amit and Chandra, Ramesh and Ogale, S. B. and Pellegrini, G. and Mazzoldi, P.} } @article { ISI:000274869900014, title = {Vanadia-titania thin films for photocatalytic degradation of formaldehyde in sunlight}, journal = {Applied Catalysis A-General}, volume = {374}, number = {1-2}, year = {2010}, month = {FEB}, pages = {103-109}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Thin films of vanadia-titania with good adhesion to the substrates have been deposited on various substrates such as glass slides, glass helix and silica raschig rings by simple sol-gel dip coating process using vanadium and titanium peroxide gel. The optimum concentration of vanadia in titania for obtaining good uniform viscous gel was found to be 0.5-4 wt\% beyond which the vanadia particles disturb the gel network, resulting in the formation of a gelatinous precipitate. The films of vanadia-titania as well as the dried powder of the bulk gel were characterized by different characterization techniques. Optical characterization by UV-vis spectrophotometer showed a shift in optical absorption wavelength to the visible region that may be due to the incorporation of vanadia into titania structure. The XRD revealed the formation of anatase phase in pure titania as well as titania with up to 2\% vanadia loading, whereas formation of rutile as minor phase along with anatase as major phase was observed at higher vanadia loading. The XRD did not show any peaks of vanadia phase up to 5\% vanadia loading indicating either incorporation of vanadia into titania structure or high dispersion of amorphous vanadia on titania support. The pure and vanadia doped TiO(2) thin films were evaluated for their photocatalytic activity for degradation of methylene blue as a model pollutant under sunlight. Doping Of V(2)O(5) in TiO(2) showed an increase in the photo-degradation rate of methylene blue by a factor of 3-6.6 times compared to pure TiO(2). The highest rate has been obtained for 4\% V(2)O(5)-doped TiO(2) films. Vanadia doped TiO(2) thin films were also found to be very active for photocatalytic degradation of formaldehyde from aqueous solution in sunlight. (c) 2009 Elsevier B.V. All rights reserved.

}, keywords = {Formaldehyde, Methylene blue, Photocatalysis, Sunlight, Thin films, V(2)O(5)/TiO(2)}, issn = {0926-860X}, doi = {10.1016/j.apcata.2009.11.035}, author = {Akbarzadeh, Rokhsareh and Shubhangi B. Umbarkar and Sonawane, Ravindra S. and Takle, Srikant and Dongare, Mohan K.} } @article { ISI:000273709900033, title = {Vice to virtue: intracellular biogenic nanoparticles for the generation of carbon supported catalysts}, journal = {Journal of Nanoscience and Nanotechnology}, volume = {10}, number = {2}, year = {2010}, month = {FEB}, pages = {905-911}, publisher = {AMER SCIENTIFIC PUBLISHERS}, address = {25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USA}, abstract = {

Intracellular biogenic nanoparticles are considered disadvantageous as the separation of the nanoparticles from the biomass becomes intricate. However realizing the importance of carbon supported catalyst for many important organic reactions we envisaged these nanoparticles as a source for carbon supported catalyst. Herein we demonstrate the heat treatment of intracellular biogenic nanoparticles under inert atmosphere as an efficient method for the preparation of carbon supported metal oxide catalysts. Aspergillus ochraceus, a fungus isolated from foundries, on incubation with K(2)TiF(6) led to the synthesis of intracellular titanium oxide nanoparticles. The nanoparticles embedded biomass upon heat treatment at 600 degrees C in a nitrogen environment gave titanium oxide nanoparticles implanted in a carbonaceous matrix. The material thus formed was characterized using FTIR spectroscopy, Raman spectroscopy, HRTEM and X-ray diffraction. Appreciable benzaldehyde selectivity was observed when styrene oxidation was carried out over such immobilized catalysts. The conversion rate was determined to be 76\% and the benzaldehyde selectivity was greater than 80\%.

}, keywords = {Benzaldehyde Selectivity, Biosynthesis, Carbon Supported Titania, Nanoparticles, Styrene Oxidation}, issn = {1533-4880}, doi = {10.1166/jnn.2010.1894}, author = {Vijayakumar, P. S. and Selvakumar, S. and Gholap, Ramkrishna S. and Singh, A. P. and Bhagavatula L. V. Prasad} } @article { ISI:000277649500046, title = {Volume transition of PNIPAM in a nonionic surfactant hexagonal mesophase}, journal = {Macromolecules}, volume = {43}, number = {10}, year = {2010}, month = {MAY}, pages = {4782-4790}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

We investigate the volume transition of a thermoresponsive polymer, poly(N-isopropylacrylamide), PNIPAM, in the presence of an aqueous solution of nonionic surfactant, C(12)E(9). We combine turbidimetry with optical microscopy, NMR, and SAXS to follow the volume transition of the PNIPAM and the H(1)-isotropic transition of the surfactant/water system. Nonionic surfactants such as C(12)E(9) are known to interact weakly with PNIPAM. Accordingly, we show that there is only a small change in the volume transition temperature for the PNIPAM in isotropic micellar solutions of C(12)E(9), even for relatively high concentrations of C(12)E(9). Interestingly, once the surfactant forms an H(1) phase, there is a dramatic decrease in the coil globule transition onset temperature. We believe that this behavior results from a competition between C(12)E(9) in the H(1) phase, and PNIPAM to associate with water. When PNIPAM in the H(1) phase is cooled to low enough temperatures so as to be in the coil state, it locally disturbs the hexagonal phase ordering. Thus, we show that for PNIPAM in a weakly interacting surfactant matrix, it is the phase behavior of the matrix rather than the matrix chemistry that governs the coil globule transition. Finally, we show that in a PNIPAM copolymer with a higher LCST we observe an interesting sequence of transitions in the surfactant phase: on cooling from a high temperature free-blowing turbid globular state (similar to 75 degrees C), we enter a free-flowing translucent coil phase (similar to 47 degrees C), then a turbid gel (similar to 25 degrees C) where the copolymer is collapsed in the HI phase, and finally a low-temperature clear gel (similar to 5 degrees C) where the copolymer is in the expanded coil state.

}, issn = {0024-9297}, doi = {10.1021/ma100357h}, author = {Jijo, V. J. and Sharma, Kamendra P. and Mathew, Renny and Kamble, Samruddhi and Rajamohanan, P. R. and Ajithkumar, Thalasseril G. and Badiger, Manohar V. and Kumaraswamy, Guruswamy} } @article { ISI:000292022700003, title = {Validation and application of auxiliary density perturbation theory and non-iterative approximation to coupled-perturbed Kohn-Sham approach for calculation of dipole-quadrupole polarizability}, journal = {Chemical Physics Letters}, volume = {510}, number = {4-6}, year = {2011}, month = {JUL}, pages = {185-190}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Recently, two non-iterative approaches have been proposed to calculate response properties within density functional theory (DFT). These approaches are auxiliary density perturbation theory (ADPT) and the non-iterative approach to the coupled-perturbed Kohn-Sham (NIA-CPKS) method. Though both methods are non-iterative, they use different techniques to obtain the perturbed Kohn-Sham matrix. In this Letter, for the first time, both of these two independent methods have been used for the calculation of dipole-quadrupole polarizabilities. To validate these methods, three tetrahedral molecules viz., P-4; CH4 and adamantane (C10H16) have been used as examples. The comparison with MP2 and CCSD proves the reliability of the methodology. (C) 2011 Elsevier B. V. All rights reserved.

}, issn = {0009-2614}, doi = {10.1016/j.cplett.2011.05.032}, author = {Shedge, Sapana V. and Pal, Sourav and Koester, Andreas M.} } @article {Das, title = {Variable water adsorption in amino acid derivative based homochiral metal organic frameworks}, journal = {Crystal Growth \& Design}, volume = {12}, number = {9}, year = {2012}, month = {SEP}, pages = {4633-4640}, abstract = {

{Six new Cd-containing homochiral metal organic framework materials [

}, author = {Kundu, Tanay and Sahoo, Subash Chandra and Banerjee, Rahul} } @article { ISI:000310721400015, title = {Vertical arrays of SiNWs-ZnO nanostructures as high performance electron field emitters}, journal = {Journal of Materials Chemistry}, volume = {22}, number = {43}, year = {2012}, month = {NOV}, pages = {22922-22928}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Multicomponent hybrid materials of nanostructured building blocks are essential for the development of complex devices and advanced applications due to their role as either functional or interconnecting elements. This study introduces a simple and cost effective strategy for the synthesis of vertical arrays of silicon nanowires and ZnO nanostructures (nanorod and multipod structures). Formation of vertical nanostructured arrays is confirmed by SEM and HRTEM imaging as well as XRD and Raman measurements. We have investigated field emission properties of the as-synthesized vertical nanostructured arrays. Our results show that these SiNWs-ZnO nanostructures are highly efficient and stable field emitters.

}, issn = {0959-9428}, doi = {10.1039/c2jm34224c}, author = {Devarapalli, Rami Reddy and Shinde, Deodatta R. and Barka-Bouaifel, Fatiha and Yenchalwar, Sandeep G. and Boukherroub, Rabah and More, Mahendra A. and Shalke, Manjusha V.} } @article { ISI:000307601300015, title = {Very practical and selective method for PMB protection of alcohols}, journal = {Tetrahedron Letters}, volume = {53}, number = {35}, year = {2012}, month = {AUG}, pages = {4683-4686}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A very simple, practical and efficient one-step heterogeneous protocol for the PMB protection of alcohols using Amberlyst-15 has been developed. The stability and hazard issues regarding PMBCI and PMBBr are totally avoided by directly using anisyl alcohol for the protection. Alcohols are protected in very good yields. The selective mono-PMB protection of diols as well as di-PMB protection of diols was achieved in good yields, along with the demonstration of recyclability of the catalyst. (c) 2012 Elsevier Ltd. All rights reserved.

}, keywords = {4-Methoxybenzyl alcohol, 4-Methoxybenzyl protection, Amberlyst-15, Di-PMB protection, Mono-PMB protection}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2012.06.084}, author = {Chavan, Subhash P. and Harale, Kishor R.} } @article { ISI:000309100600009, title = {Vibrational multi-reference coupled cluster theory in bosonic representation}, journal = {Journal of Chemical Physics}, volume = {137}, number = {11}, year = {2012}, month = {SEP}, pages = {114108}, publisher = {AMER INST PHYSICS}, address = {CIRCULATION \& FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA}, abstract = {

The vibrational multi-reference coupled cluster method is developed to calculate the vibrational excitation energies of polyatomic molecules. The method is implemented on ozone and formaldehyde molecules and the results are compared with full vibrational configuration interaction (FVCI) method. A good agreement is found between the vibrational multi-reference coupled cluster method and converged FVCI method for lower lying vibrational states. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4753422]

}, issn = {0021-9606}, doi = {10.1063/1.4753422}, author = {Banik, Subrata and Pal, Sourav and Prasad, M. Durga} } @article { ISI:000300462600010, title = {Viscosity dependence of intra- and intermolecular diels-alder reactions}, journal = {Journal of Physical Chemistry A}, volume = {116}, number = {4}, year = {2012}, month = {FEB}, pages = {1191-1198}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

The kinetics of the bimolecular Die Is Alder reaction between anthracene-9-carbinol and N-ethyl maleimide have been studied in a series of pyridinium-based ionic liquids with the tetrafluoroborate ([BF4](-)) and the bis(trifluorosulfonimide) ([NTf2](-)) anions and the viscosity dependence of the rate constants have been compared with the results for the intramolecular Diels Alder reaction of (E)-1-phenyl-4-[2-(3-methyl-2-butenyloxy)benzylidene]-5-pyrazolone. The comparison leads to the surprising observation that the intermolecular reaction is less susceptible to viscosity variations of the ionic liquids as compared to the intramolecular reaction. The observed similarities and differences emphasize the complicated nature of solvent friction on the kinetics of cycloaddition reactions. The results are explained by considering the bimolecular and intramolecular processes as cases of translational and rotational diffusion, respectively. Plausible indicators of microviscosity consistent with the kinetic data for the Diels-Alder reactions are briefly discussed along with the constraints involved in designing a general microviscosity scale.

}, issn = {1089-5639}, doi = {10.1021/jp208989z}, author = {Tiwari, Shraeddha and Kumar, Anil} } @article { ISI:000300458200002, title = {Visible light photoredox catalysis: generation and addition of N-aryltetrahydroisoquinoline-derived alpha-amino radicals to michael acceptors}, journal = {Organic Letters}, volume = {14}, number = {3}, year = {2012}, month = {FEB}, pages = {672-675}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

The photoredox-catalyzed coupling of N-aryltetrahydroisoquinoline and Michael acceptors was achieved using Ru(bpy)(3)Cl-2 or [Ir(ppy)(2)-(dtb-bpy)]PF6 in combination with irradiation at 455 nm generated by a blue LED, demonstrating the trapping of visible light generated alpha-amino radicals. While intermolecular reactions lead to products formed by a conjugate addition, in intramolecular variants further dehydrogenation occurs, leading directly to 5,6-dihydroindolo[2,1-a]tetrahydroisoquinolines, which are relevant as potential immunosuppressive agents.

}, issn = {1523-7060}, doi = {10.1021/ol202857t}, author = {Kohls, Paul and Jadhav, Deepak and Pandey, Ganesh and Reiser, Oliver} } @article { ISI:000304888700036, title = {Visible-light-induced photosplitting of water over gamma {\textquoteleft}-Fe4N and gamma {\textquoteleft}-Fe4N/alpha-Fe2O3 nanocatalysts}, journal = {Journal of Physical Chemistry C}, volume = {116}, number = {22}, year = {2012}, month = {JUN}, pages = {12156-12164}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

The application of gamma{\textquoteright}-Fe4N, a noble-metal-free, low-cost catalyst, in the photosplitting of neat water into stoichiometric amounts of H-2 and O-2 under visible-light irradiation is reported for the first time. The catalyst showed optical absorption and photoluminescence emission bands in the entire visible region. The photocatalytic water-splitting activity was wavelength-dependent, the quantum efficiency for H-2 evolution being ca. 1.7 and 0.7\% at excitation wavelengths of 450 and 500 nm, respectively. Addition of electron donor/acceptor sacrificial reagents considerably affected the yield and stoichiometry of H-2 and O-2. At the same time, the product yield increased in a composition-dependent manner for (gamma{\textquoteright}-Fe4N)(x) + (alpha-Fe2O3)(1-x) nanocomposites. This activity augmentation is ascribed to the better dispersion of the active component gamma{\textquoteright}-Fe4N and also to the availability of more active surface sites at Fe4N/Fe2O3 contacts. Moreover, the proximity of the valence band potential of the component photosystems promotes the preferential transfer/entrapment of photoexcited hole carriers. We envisage that the defect/impurity-induced interband-gap energy states may play a vital role in these charge-transfer processes, leading thereby to more effective e(-)-h(+) separation and the enhanced rate of the water-splitting reaction. First-principles electronic structure analysis suggests that the extraordinary photocatalytic and optical properties of intermetallic gamma{\textquoteright}-Fe4N may arise from the particle-size-dependent changes in electronic structure.

}, issn = {1932-7447}, doi = {10.1021/jp303255f}, author = {Dhanasekaran, P. and Salunke, Hemant G. and Gupta, Narendra M.} } @article {43234, title = {VUV Photoionization and Ab initio determination of the ionization energy of a gas-phasesugar (deoxyribose)}, journal = {Journal of Physical }, volume = {3}, year = {2012}, month = {JAN}, pages = { 97-101}, abstract = {The ionization energy of gas-phase deoxyribose was determined using tunable vacuum ultraviolet synchrotron radiation coupled to an effusive thermal source. Adiabatic and vertical ionization energies of the ground and first four excited states of alpha-pyranose, the structure that dominates in the gas phase, were calculated using high-level electronic structure methods. An appearance energy of 9.1(+/- 0.05) eV was recorded, which agrees reasonably well with a theoretical value of 8.8 eV for the adiabatic ionization energy. A clear picture of the dissociative photoionization dynamics of deoxyribose emerges from the fragmentation pattern recorded using mass spectrometry and from ab initio molecular dynamics calculations. The experimental threshold 9.4 (+/- 0.05) eV for neutral water elimination upon ionization is captured well in the calculations, and qualitative insights are provided by molecular orbital analysis and molecular dynamics snapshots along the reaction coordinate.}, doi = {10.1021/jz201446r}, author = {Ghosh, Debashree and Golan, Amir and Takahashi, Lynelle K. and Krylov, Anna I. and Ahmed, Musahid} } @article { ISI:000326301000047, title = {Variable-temperature time-resolved emission spectra studies of random pyrene urethane methacrylate copolymers with high pyrene incorporation}, journal = {Journal of Physical Chemistry B}, volume = {117}, number = {39}, year = {2013}, month = {OCT}, pages = {11863-11876}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

A series of random co-polyurethane methacrylate comb polymers with pyrene (Py) and 3-pentadecylphenol (PDP) as pendant units Were prepared by free radical polymerization. The pyrene labeling was varied from 1 to 100 mol \%. The excimer emission of these copolymers were studied as a function of both time and temperature using time-resolved emission spectra (TRES) experiments and variable-temperature steady-state fluorescence measurements. Variable-temperature steady-state as well as decay experiments showed that the contribution from excimers via diffusional encounters increased at the cost of pyrene monomer as the temperature increased until similar to 50 degrees C; beyond which nonradiative losses predominated. TRES collected at 25 and 70 degrees C were compared to study the nature and origin of emitting species as a function of pyrene loading. TRES at 25 degrees C dearly indicated the presence of ground state pyrene dimers with emission centered at similar to 435 nm which soon gave way to emission centered around 465 and 485 nm in the time gated spectra collected at higher time intervals. In TRES collected at 70 degrees C, excimer emission centered at 465 and 485 nm was very high even at short time scales. The lowest pyrene loaded polymer PIHPDP-1Py did not exhibit excimer emission in the TRES collected at 25 degrees C as well as 70 degrees C.

}, issn = {1520-6106}, doi = {10.1021/jp406885f}, author = {Kaushlendra, K. and Asha, S. K.} } @article { ISI:000334895800008, title = {Value addition to lignocellulosics and biomass-derived sugars: an insight into solid acid-based catalytic methods}, journal = {Journal of Chemical Sciences}, volume = {126}, number = {2, SI}, year = {2014}, note = {21st National Symposium on Catalysis (CATSYMP), CSIR Indian Inst Chem Technol, Hyderabad, INDIA, FEB 11-13, 2013}, month = {MAR}, pages = {373-385}, publisher = {Catalysis Soc India}, type = {Article, Proceedings Paper}, address = {C V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIA}, abstract = {

For the synthesis of important platform chemicals such as sugars (xylose and arabinose) and furans (furfural and 5-hydroxymethylfurfural (HMF)) from carbohydrates (hemicellulose and fructose) solid acid catalysts are employed. Similarly, over solid acid catalysts, conversion of lignin into aromatic monomers is performed. It is observed that in the dehydration of fructose, because of higher hydrothermal stability, silicoaluminophosphate (SAPO) catalysts give better activity (78\% HMF yield) compared with other solid acid catalysts (\<63\% HMF yield) at 175 degrees C. Particularly, SAPO-44 catalyst can be reused at least 5 times with marginal decrease in the activity. Zeolite, BUSY (Si/Al = 15) is active in the conversion of isolated (pure) hemicellulose to produce 41\% C-5 sugars in water. The catalyst is also active in the selective conversion of hemicellulose from bagasse to yield 59\% C-5 sugars. It is possible to obtain high yields of furfural (54\%) directly from bagasse if instead of water, Water+toluene solvent system is used. Depolymerization of lignin using HUSY catalyst produced aromatic monomers with 60\% yield at 250 degrees C. A detailed catalyst characterization study is performed to understand the correlation between catalyst activity and morphology. To understand the effect of impurities present in the substrate over solid acid catalysts, metal-exchange study is carried out.

}, keywords = {aromatic monomers, Biomass, furans, Hemicellulose, lignin, solid acid catalyst}, issn = {0974-3626}, author = {Bhaumik, Prasenjit and Deepa, Ayillath K. and Kane, Tanushree and Dhepe, Paresh Laxmikant} } @article { ISI:000331493200090, title = {Vapor-liquid-solid growth of one-dimensional tin sulfide (sns) nanostructures with promising field emission behavior}, journal = {ACS Applied Materials \& Interfaces}, volume = {6}, number = {3}, year = {2014}, month = {FEB}, pages = {2018-2025}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

Single-crystalline ultralong tin sulfide (SnS) nanowires has been grown by a thermal evaporation technique under optimized conditions on gold-coated silicon substrates, and for the first time, field emission investigations on the SnS nanowires at the base pressure of 1 X 10(-8) mbar are reported. It has been revealed that the surface morphology of the as-synthesized SnS nanostructures is significantly influenced by the deposition temperature and duration. Structural and morphological analyses of as-synthesized SnS nanostructures have been carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). To understand the optical and electronic properties of as-synthesized SnS nanowires, ultraviolet-visible (UV-vis), photo-luminescence (PL), and X-ray photoelectron spectroscopy (XPS) studies were carried out. The SEM and TEM measurements reveal the formation of ultralong SnS nanowires, with an average diameter of 80 nm. A plausible explanation on the vapor-solid-liquid (VLS) growth mechanism based on the experimental results and reported literature has been presented. Furthermore, the field emission characteristics of the SnS nanowires are found to be superior to the other metal chalcogenide nanostructures. The synthesized SnS nanowire emitter delivers a high current density of similar to 2.5 mA/cm(2) at an applied electric field of similar to 4.55 V/mu m. The emission current stability over a period of 6 h is observed to be good. The observed results demonstrate the potential of the SnS nanowire emitter as an electron source for practical applications in vacuum nano/microelectronic devices.

}, keywords = {Electron emission, ID nanostructure, SnS nanowires, thermal evaporation, vapor-liquid-solid (VLS) growth}, issn = {1944-8244}, doi = {10.1021/am405039j}, author = {Suryawanshi, Sachin R. and Warule, Sambhaji S. and Patil, Sandip S. and Patil, Kashinath R. and More, Mahendra A.} } @article { ISI:000336738400017, title = {Variation of CO2 adsorption in isostructural Cd(II)/Co(II) based MOFs by anion modulation}, journal = {CrystEngComm}, volume = {16}, number = {23}, year = {2014}, month = {JUN}, pages = {5012-5020}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

{A potential multidentate tris-pyridyl ligand has been synthesized, and later employed for the tailoring of four isostructural cadmium(II)/cobalt(II) two dimensional (2D) metal organic frameworks, [[ M(dmpt)(2)(X)(2)].xS](n), where S = solvent

}, issn = {1466-8033}, doi = {10.1039/c4ce00058g}, author = {Singh, Udai P. and Narang, Shikha and Pachfule, Pradip and Banerjee, Rahul} } @article { ISI:000335773800005, title = {Vesicle structures from bolaamphiphilic biosurfactants: experimental and molecular dynamics simulation studies on the effect of unsaturation on sophorolipid self-assemblies}, journal = {Chemistry-A European Journal}, volume = {20}, number = {21}, year = {2014}, month = {MAY}, pages = {6246-6250}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

The formation of giant-vesicle-like structures by self-assembling linolenic acid sophorolipid (LNSL) molecules is revealed. Sophorolipids belong to the class of bolaamphiphilic glycolipid biosurfactants. Interestingly, the number of double bonds present in the hydrophobic core of sophorolipids is seen to have a great influence on the type of self-assembled structures formed. Dye encapsulation results establish the presence of an aqueous compartment inside the LNSL vesicles. Molecular dynamics simulation (MD) studies suggest the existence of two possible conformations of LNSLs inside the self-assembled structures and that LNSL molecules arrange in layered structures.

}, keywords = {bolaamphiphiles, MD simulations, Self-assembly, sophorolipids, vesicles}, issn = {0947-6539}, doi = {10.1002/chem.201304719}, author = {Dhasaiyan, Prabhu and Pandey, Prithvi Raj and Visaveliya, Nikunjkumar and Roy, Sudip and Bhagavatula L. V. Prasad} } @article { ISI:000347302000013, title = {Vanadium in borosilicate glass}, journal = {Journal of the American Ceramic Society}, volume = {98}, number = {1}, year = {2015}, month = {JAN}, pages = {88-96}, publisher = {WILEY-BLACKWELL}, address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA}, abstract = {

Understanding the role of V2O5 within borosilicate glass matrices is important for the development of novel matrices toward immobilization of sulfate containing high-level nuclear wastes. Present investigation shows, within sodium barium borosilicate glass matrix V2O5 can be homogeneously added up to 5mol\% and beyond which it separates out into three phases, for example, (i) silica (ii) Barium (Ba) - Vanadium (V) oxide, and (iii) glass matrix. Si-29 MAS NMR (Nuclear Magnetic Resonance) studies of the samples show that below 5mol\% V2O5 addition, silicate network is dominantly constituted of Q(2) and Q(3) structural units, whereas above this, the network gets more polymerized through formation of Q(3) and Q(4) units. In case of borate network, B-11 MAS NMR investigations revealed that the concentration of BO4 [(0B, 4Si)] unit increases gradually up to 5mol\% and then it decreases at the cost of BO4 [(1B, 3Si)], BO3 (symmetric) and BO3 (asymmetric) units. Micro-Raman analyses of the samples showed that with additions of V2O5 in diluted concentrations, amorphous silicate network remained unaltered, whereas some amplification in signals corresponding to ring-type metaborate and VO5 units exists. It is therefore apparent from both MAS-NMR and micro-Raman studies that with V2O5 additions within the solubility limit (5mol\%), borate network gets depolymerized leading to decrease in hardness from an average value of 5.0-4.2GPa.

}, issn = {0002-7820}, doi = {10.1111/jace.13303}, author = {Sengupta, Pranesh and Dey, Krishna K. and Halder, Rumu and Ajithkumar, Thalasseril G. and Abraham, Geogy and Mishra, Raman K. and Kaushik, Chetan P. and Dey, Goutam K.} } @article { ISI:000359136500056, title = {Vapour-liquid-solid growth of one-dimensional In2Se3 nanostructures and their promising field emission behaviour}, journal = {RSC Advances}, volume = {5}, number = {80}, year = {2015}, month = {JUL}, pages = {65274-65282}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Single crystalline ultra long In2Se3 nanowires have been grown by employing a single step facile thermal evaporation route under optimized conditions on Au/Si wafers, and morphology dependent field emission investigations on the In2Se3 nanostructure at the base pressure -1 x 10(-8) mbar are explored. In addition, structural and morphological analysis of as-synthesized In2Se3 nanostructures has been carried out using XRD, SEM and TEM. A plausible explanation of the vapor-solid-liquid (VLS) growth mechanism based on the experimental results and reported literature has been presented. Furthermore, field emission measurements demonstrate remarkably enhanced emission behaviour, which is explained on the basis of the field enhancement factor and aspect ratio of the nanostructures. The synthesized In25e3 nanowire emitter delivers a very high current density of -1.2 mA cm(-2) at an applied electric field of -6.33 cm(-1). The present results demonstrate In2Se3 as an important candidate for potential applications in nano/micro-electronic devices.

}, issn = {2046-2069}, doi = {10.1039/c5ra10160c}, author = {Suryawanshi, Sachin R. and Bankar, Prashant K. and More, Mahendra A. and Late, Dattatray J.} } @article {43033, title = {Viridians group streptococci in patients undergoing tooth extraction}, journal = {European Journal of General Medicine}, volume = {12}, year = {2015}, month = {SEP}, pages = {227-233}, abstract = {

The aerobic microflora of the oral cavity consists of viridians group of streptococci (VGS). The present study was carried out with an objective to evaluate the prevalence of VGS in patients undergoing tooth extraction and to study their antibiotic susceptibility pattern. Samples of subgingival dental plaques for microbiological studies were collected from 80 patients undergoing tooth extraction. The isolated streptococci were identified along with their antibacterial susceptibilities by automated Vitek 2 (bioM{\'e}rieux) system in accordance with CLSI standards. A total of 260 VGS strains belonging to 05 phenotypic groups, namely mutans, salivarius, anginosus, sanguinus and mitis groups; along with few strains of Granulicatella like G. adiacens and G. elegans. Altogether a total of 15 species were isolated from the subgingival plaque of 80 patients undergoing tooth extraction. Among the 15 antibiotics tested, highest resistance was observed to lincosamides (36.2\%) followed by macrolides (29.7\%), tetracyclines (17.7\%), cephems (15.1\%), fluoroquinolones (14.4\%), oxazolidinones (13.5\%), streptogramins (12.7 \%) and penicillins (7.9\%). However, all the 260 VGS strains were found susceptible to vancomycin and linezolid. In the subgingival plaque of patients undergoing tooth extraction, approximately 70\% of streptococci belonged to three VGS groups, i.e. mitis, sanguinis and mutans groups. Streptococci of salivarus and anginosus groups were isolated sporadically (5\%). Highest resistance was observed to lincosamides and macrolides (29.7\%). Multiple antibiotic resistance was observed in mitis and salivarius group.

}, doi = {10.15197/sabad.1.12.48}, author = {Dhotre, Shree V. and Dharne, Mahesh S. and Potdar, S. and Suklikar, J. and Suryawanshi, Namdev and Nagoba, Basavraj} } @article {42477, title = {Visible light-triggered disruption of micelles of an amphiphilic block copolymer with BODIPY at the junction}, journal = {Chemical Communications}, volume = {51}, year = {2015}, month = {OCT}, pages = {17708-17711}, abstract = {

A visible light-cleavable polymer is synthesised to overcome the limitations of UV-sensitive polymers. Photocleavable BODIPY functionalized with an ATRP initiator and alkyne was used to obtain an amphiphilic block copolymer by conducting the click reaction and polymerization simultaneously. Micellar assembly of the polymer was disintegrated under visible light irradiation with controlled release of cargo.

}, doi = {10.1039/C5CC06820G}, author = {Patil, Naganath G. and Basutkar, Nitin B. and Ambade, Ashootosh V.} } @article { ISI:000355360200058, title = {Vitellibacter nionensis sp nov., isolated from a shallow water hydrothermal vent}, journal = {International Journal of Systematic and Evolutionary Microbiology}, volume = {65}, number = {2}, year = {2015}, month = {FEB}, pages = {692-697}, publisher = {SOC GENERAL MICROBIOLOGY}, address = {MARLBOROUGH HOUSE, BASINGSTOKE RD, SPENCERS WOODS, READING RG7 1AG, BERKS, ENGLAND}, abstract = {

A novel, Gram-stain-negative, non-motile, rod-shaped yellow bacterium, designated VBW088(T) was isolated from a shallow water hydrothermal vent in Espalamaca in the Azores. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain VBW088(T) clustered with three type strains of species of the genus Vitellibacter and exhibited a sequence similarity of 97.3\% with Vitellibacter soesokkakensis RSSK-12(T). However, strain VBW088(T) and V. soesokkakensis RSSK-12(T) exhibited low DNA-DNA relatedness (12.7 +/- 3.5 \%). Strain VBW088(T) was positive for catalase and oxidase. Growth occurred at 10-37 degrees C, with the optimum at 80 degrees C, and at pH 6.0-8.0 (optimum pH 6.0) and in up to 5\% (w/v) NaCl with optimum growth at 1-2\% (w/v) NaCl. The major fatty acids (\>10\%) were iso-C-15:0 (33.5\%) and iso-C-17:0 3-OH (32.0\%). The polar lipids detected in strain VBW088(T) consisted of phosphatidylethanolamine, one unidentified aminolipid and three unidentified phospholipids. The DNA G+C content of strain VBW088(T) was 36.7 mol\%. On the basis of phylogenetic inference, DNA-DNA relatedness, chemotaxonomic analysis and physiological data, the isolate represents a novel species of the genus Vitellibacter, for which the name Vitellibacter nionensis sp. nov. is proposed, with the type strain as VBW088(T). (=KCTC 32420(T)=MCC 2354(T)).

}, issn = {1466-5026}, doi = {10.1099/ijs.0.070805-0}, author = {Rajasabapathy, Raju and Mohandass, Chellandi and Yoon, Jung-Hoon and Dastager, Syed Gulam and Liu, Qing and Thi-Nhan Khieu and Chu Ky Son and Li, Wen-Jun and Colaco, Ana} } @article { ISI:000350194500001, title = {Void fraction measurement using electrical capacitance tomography and high speed photography}, journal = {Chemical Engineering Research \& Design}, volume = {94}, year = {2015}, month = {FEB}, pages = {1-11}, publisher = {INST CHEMICAL ENGINEERS}, address = {165-189 RAILWAY TERRACE, DAVIS BLDG, RUGBY CV21 3HQ, ENGLAND}, abstract = {

Gas-liquid flows are encountered in variety of industrial applications including boilers, distillation towers, chemical reactors, oil pipelines, nuclear reactors etc. The measurement of two-phase flow parameters such as flow regime and void fraction is considerably important and play an important role in characterization of the hydrodynamic behavior of such gas-liquid two phase systems. The void fraction is a dimensionless quantity and is often termed as {\textquoteleft}{\textquoteleft}holdup or fraction{\textquoteright}{\textquoteright} in two-phase flows. According to industrial applications; it is essential to develop measurement technique for void fraction measurement which can work in hot and opaque systems. Therefore, an attempt was made here to establish electrical capacitance tomography (ECT) facility for measuring void fraction and flow regimes as well as develop suitable data processing methodologies. In the present work, focus was to measure void fraction using ECT technique and compares it with conventional and high speed photography technique. Therefore, that will give guidelines of using ECT technique for hot and opaque systems like boiling flows. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier BM. All rights reserved.

}, keywords = {ECT, Flow regimes, Two phase flow, Void fraction}, issn = {0263-8762}, doi = {10.1016/j.cherd.2014.11.013}, author = {Sardeshpande, Madhavi V. and Harinarayan, Sagar and Ranade, Vivek V.} } @article { ISI:000371102800019, title = {Validation of force fields of rubber through glass-transition temperature calculation by microsecond atomic-scale molecular dynamics simulation}, journal = {Journal of Physical Chemistry B}, volume = {120}, number = {7}, year = {2016}, month = {FEB}, pages = {1367-1379}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

Microsecond atomic-scale molecular dynamics simulation has been employed to calculate the glass-transition temperature (T-g) of cis- and trans-1,4-polybutadiene (PB) and 1,4-polyisoprene (PI). Both all-atomistic and united-atom models have been simulated using force fields, already available in literature. The accuracy of these decade old force fields has been tested by comparing calculated glass-transition temperatures to the corresponding experimental values. T-g depicts the phase transition in elastomers and substantially affects various physical properties of polymers, and hence the reproducibility of T-g becomes very crucial from a thermodynamic point of view. Such validation using T-g also evaluates the ability of these force fields to be used for advanced materials like rubber nanocomposites, where T-g is greatly affected by the presence of fillers. We have calculated T-g for a total of eight systems, featuring all-atom and united-atom models of cis- and trans-PI and-PB, which are the major constituents of natural and synthetic rubber. Tuning and refinement of the force fields has also been done using quantum-chemical calculations to obtain desirable density and T-g. Thus, a set of properly validated force fields, capable of reproducing various macroscopic properties of rubber, has been provided. A novel polymer equilibration protocol, involving potential energy convergence as the equilibration criterion, has been proposed. We demonstrate that not only macroscopic polymer properties like density, thermal expansion coefficient, and T-g but also local structural characteristics like end-to-end distance (R) and radius of gyration (R-g) and mechanical properties like bulk modulus have also been equilibrated using our strategy. Complete decay of end-to-end vector autocorrelation function with time also supports proper equilibration using our strategy.

}, issn = {1520-6106}, doi = {10.1021/acs.jpcb.5b10789}, author = {Sharma, Pragati and Roy, Sudip and Karimi-Varzaneh, Hossein Ali} } @article {43414, title = {Valorization of banana peel: a biorefinery approach}, journal = {Reviews in Chemical Engineering}, volume = {32}, year = {2016}, month = {DEC}, pages = {651-666}, abstract = {Banana peel (BP) is an agrowaste produced in large volumes annually, especially by food-processing industries; however, its disposal is of significant concern. However, recent research suggests that BP is a valuable source of bioactive compounds, which can be converted into value-added products. This article reviews the conversion process of value-added products from BP and provides an outline on the chemical composition of BP and its possible applications. In addition, we also discuss the - utilization of BP as a substrate to produce animal feed, biofertilizer, dietary fibers, clean energy, industrial enzymes, as well as its use in the synthesis of nanomaterials. Based on the research conducted so far, it is obvious that BP has a wide variety of applications, and thus, developing a biorefinery approach to adequately utilize BP will help realize its economic benefits to the fullest. Based on the valorization of BP, a scheme for BP biorefinery has been proposed. A material balance for BP biorefinery for 1-ton bone-dry BP is presented and our results show that 432 kg of protein or 170 kg of citric acid, 170 kg of pectin, 325 m(3) of ethanol, and 220 m(3) of methane can be produced.}, doi = {10.1515/revce-2015-0063}, author = {Pathak, Pranav D. and Mandavgane, Sachin A. and Kulkarni, Bhaskar D.} } @article {45831, title = {Valorization of coffee bean waste: a coffee bean waste derived multifunctional catalyst for photocatalytic hydrogen production and electrocatalytic oxygen reduction reactions}, journal = {RSC Advances}, volume = {6}, year = {2016}, month = {AUG}, pages = {82103-82111}, type = {Article}, abstract = {

Here, we report the valorization of coffee bean waste (CBW) by producing nitrogen doped porous carbon (p-Cof) having both photocatalytic and electrocatalytic properties using a silica templating method. Morphological investigation of p-Cof reveals the presence of assemblies of highly porous flat carbon blocks. p-Cof exhibits a high surface area (1213 m(2) g(-1)) and a wide range of micro-and mesopores with good electrical conductivity. Along with this, the surface of p-Cof displays the presence of graphitic and pyridone-type nitrogen coordinations, which help p-Cof to perform as a multifunctional catalyst as revealed from its catalytic activities towards photocatalytic hydrogen production (PHP) and electrocatalytic oxygen reduction reactions. p-Cof produces 334 mu mol h(-1) g(-1) of hydrogen from water under visible light and 575 mmol h(-1) g(-1) of hydrogen under solar light irradiation with excellent stability. Along with this, p-Cof also displays improved oxygen reduction reaction (ORR) activity in alkaline medium. A better onset potential (0.91 V vs. RHE) and half-wave potential (0.75 V vs. RHE) are displayed by p-Cof compared to the catalyst derived from the simple annealing of CBW without employing the silica template. Along with the better electrochemical activity, p-Cof shows excellent ORR kinetics and electrochemical stability compared to the current state-of-the-art Pt/C.

}, issn = {2046-2069}, doi = {10.1039/c6ra14907c}, author = {Unni, SreeKuttan M. and George, Leena and Bhange, Siddheshwar N. and Devi, R. Nandini and Kurungot, Sreekumar} } @article { ISI:000374873100022, title = {Various types of separation membranes}, journal = {Current Science}, volume = {110}, number = {8}, year = {2016}, month = {APR}, pages = {1426-1438}, publisher = {INDIAN ACAD SCIENCES}, address = {C V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIA}, abstract = {

Membrane-based separation is a superior alternative to conventional processes in many separation problems of practical importance. For maximum effectiveness, both high selectivity and flux are desirable. This article summarizes the global efforts at designing new membrane materials, particularly carbon nanotube (CNT)-based membranes, to achieve the twin objectives mentioned above. Interest in CNT emanates from the excellent transport property of molecules through its frictionless smooth walls, with/without functionalization at the end tips. Permeation of water through graphene oxide (GO) channels, which are otherwise impermeable to solutes, has also generated considerable interest, and GO is being viewed as a promising material for separations. The performances of conducting polymers like polypyrrole, polyaniline, polythiophene-3, 4-ethylenedioxythiophene and their different composites have been studied as a function of changes in morphology and redox behaviour, and this aspect too is covered in the present article. Also, the dependence of the separation performances based on the size, charge and hydrophobic/hydrophilic properties has been discussed in detail. Advances in understanding will have an important bearing on future developments in separation science.

}, keywords = {carbon nanotube, conducting polymers, flux, graphene oxide, permeability, separation membranes}, issn = {0011-3891}, author = {Das, Debasree and Datta, Anindya and Contractor, Aliasgar Qutub} } @article { ISI:000369482900030, title = {Venkataraman Jagannathan (1921-2015)}, journal = {Current Science}, volume = {110}, number = {2}, year = {2016}, month = {JAN}, pages = {263}, publisher = {INDIAN ACAD SCIENCES}, address = {C V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIA}, issn = {0011-3891}, author = {Deshpande, Mukund V.} } @article { ISI:000371419200030, title = {Versatile Cu-II metal-organic framework exhibiting high gas storage capacity with selectivity for CO2: conversion of CO2 to cyclic carbonate and other catalytic abilities}, journal = {Chemistry-A European Journal}, volume = {22}, number = {10}, year = {2016}, month = {MAR}, pages = {3387-3396}, publisher = {WILEY-V C H VERLAG GMBH}, address = {POSTFACH 101161, 69451 WEINHEIM, GERMANY}, abstract = {

A linear tetracarboxylic acid ligand, H4L, with a pendent amine moiety solvothermally forms two isostructural metal-organic frameworks (MOFs) L-M (M=Zn-II, Cu-II). Framework L-Cu can also be obtained from L-Zn by post- synthetic metathesis without losing crystallinity. Compared with L-Zn, the L-Cu framework exhibits high thermal stability and allows removal of guest solvent and metal-bound water molecules to afford the highly porous, L-Cu. At 77K, L-Cu absorbs 2.57wt\% of H-2 at 1bar, which increases significantly to 4.67wt\% at 36bar. The framework absorbs substantially high amounts of methane (238.38cm(3)g(-1), 17.03wt\%) at 303K and 60bar. The CH4 absorption at 303K gives a total volumetric capacity of 166cm(3)(STP)cm(-3) at 35bar (223.25cm(3)g(-1), 15.95wt\%). Interestingly, the NH2 groups in the linker, which decorate the channel surface, allow a remarkable 39.0wt\% of CO2 to be absorbed at 1bar and 273K, which comes within the dominion of the most famous MOFs for CO2 absorption. Also, L-Cu shows pronounced selectivity for CO2 absorption over CH4, N-2, and H-2 at 273K. The absorbed CO2 can be converted to value-added cyclic carbonates under relatively mild reaction conditions (20bar, 120 degrees C). Finally, L-Cu is found to be an excellent heterogeneous catalyst in regioselective 1,3-dipolar cycloaddition reactions (click reactions) and provides an efficient, economic route for the one-pot synthesis of structurally divergent propargylamines through three-component coupling of alkynes, amines, and aldehydes.

}, keywords = {click reactions, CO2 absorption, cyclic carbonate, heterogeneous catalysis, metal-organic frameworks}, issn = {0947-6539}, doi = {10.1002/chem.201504747}, author = {De, Dinesh and Pal, Tapan K. and Neogi, Subhadip and Senthilkumar, S. and Das, Debasree and Sen Gupta, Sayam and Bharadwaj, Parimal K.} } @article { ISI:000380565100006, title = {Virtual screening techniques to probe the antimalarial activity of some traditionally used phytochemicals}, journal = {Combinatorial Chemistry \& High Throughput Screening}, volume = {19}, number = {7}, year = {2016}, month = {JUL}, pages = {572-591}, publisher = {BENTHAM SCIENCE PUBL LTD}, address = {EXECUTIVE STE Y-2, PO BOX 7917, SAIF ZONE, 1200 BR SHARJAH, U ARAB EMIRATES}, abstract = {

Malaria parasites show resistance to most of the antimalarial drugs and hence developing antimalarials which can act on multitargets rather than a single target will be a promising strategy of drug design. Here we report a new approach by which virtual screening of 292 unique phytochemicals present in 72 traditionally important herbs is used for finding out inhibitors of plasmepsin-2 and falcipain-2 for antimalarial activity against P. falciparum. Initial screenings of the selected molecules by Random Forest algorithm model of Weka using the bioassay datasets AID 504850 and AID 2302 screened 120 out of the total 292 phytochemicals to be active against the targets. Toxtree scan cautioned 21 compounds to be either carcinogenic or mutagenic and were thus removed for further analysis. Out of the remaining 99 compounds, only 46 compounds offered drug-likeness as per the {\textquoteleft}rule of five{\textquoteright} criteria. Out of ten antimalarial drug targets, only two target proteins such as 3BPF and 3PNR of falcipain-2 and 1PFZ and 2BJU of plasmepsin-2 are selected as targets. The potential binding of the selected 46 compounds to the active sites of these four targets was analyzed using MOE software. The docked conformations and the interactions with the binding pocket residues of the target proteins were understood by {\textquoteleft}Ligplot{\textquoteright} analysis. It has been found that 8 compounds are dual inhibitors of falcipain-2 and plasmepsin-2, with the best binding energies. Compound 117 (6aR, 12aS)-12a-Hydroxy-9-methoxy-2,3-dimethylenedioxy-8-prenylrotenone (Usaratenoid C) present in the plant Millettia usaramensis showed maximum molecular docking score.

}, keywords = {ADME, malaria, Molecular docking, molecular operating environment, Plasmodium falciparum, virtual screening, weka}, issn = {1386-2073}, doi = {10.2174/1386207319666160420141200}, author = {Shibi, Indira G. and Aswathy, Lilly and Jisha, Radhakrishnan S. and Masand, Vijay H. and Gajbhiye, Jayant M.} } @article { ISI:000368032100012, title = {Vitro and in silico antifungal efficacy of nitrogen- doped carbon nanohorn ( NCNH) against rhizoctonia solani}, journal = {Journal of Biomolecular Structure \& Dynamics}, volume = {34}, number = {1}, year = {2016}, month = {JAN}, pages = {152-162}, publisher = {TAYLOR \& FRANCIS INC}, type = {Article}, address = {530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA}, abstract = {

We have investigated in vitro antifungal efficiency of nitrogen-doped carbon nanohorn (NCNH) against Rhizoctonia solani (R. solani) plant pathogenic fungi. NCNH with size of 50-60nm and concentrations of 10, 50, 100, and 150gmL(-1) were used. The results showed that growth of fungi in the presence of NCNH was significantly (p\>.05) inhibited at 150gmL(-1) (85.13 +/-.97) after 72h. The results were validated through computational approaches. Molecular docking analysis of NCNH with endochitinase protein of R. solani was performed to validate the potential of antifungal activity of NCNH. Docking results showed different conformations of interaction of NCNH with endochitinase enzyme. The conformation with least binding energy -13.54kcal/mol was considered further. It is likely that NCNH interacts with the pathogens by mechanically wrapping, which may be one of the major toxicity actions of NCNH against R. solani. The analysis showed that NCNH might interwinds to endochitinase of R. solani leading to the deactivation of the enzyme. To best of our knowledge, this is the first report of antifungal efficacy of NCNH against R. solani and provides useful information about the application of NCNH in resisting crop disease.

}, keywords = {docking, endochitinase, nitrogen-doped carbon nanohorn, Rhizoctonia solani}, issn = {0739-1102}, doi = {10.1080/07391102.2015.1018841}, author = {Dharni, Seema and Sanchita and Unni, SreeKuttan M. and Kurungot, Sreekumar and Samad, Abdul and Sharma, Ashok and Patra, Dharani Dhar} } @article {43859, title = {Validity of the Rosenfeld relationship: a comparative study of the network forming NTW model and other simple liquids}, journal = {Journal of Chemical Sciences}, volume = {129}, year = {2017}, month = {JUL}, pages = {793-800}, type = {Article}, abstract = {In this paper we explore the validity of the Rosenfeld and the Dzugutov relation for the Lennard-Jones (LJ) system, its repulsive counterpart, the WCA system and a network forming liquid, the NTW model. We find that for all the systems both the relations are valid at high temperature regime with an universal exponent close to 0.8. Similar to that observed for the simple liquids, the LJ and the WCA systems show a breakdown of the scaling laws at the low temperature regime. However for the NTW model, which is a simple liquid, these scaling laws are valid even at lower temperature regime similar to that found for ionic melts. Thus we find that the NTW model has mixed characteristics of simple liquids and ionic melts. Our study further reveals a quantitative relationship between the Rosenfeld and the Arrhenius relations. For strong liquids, the validity of the Rosenfeld relation in the low temperature regime is connected to it following the Arrhenius behaviour in that regime. Finally we explore the role of pair entropy and residual multiparticle entropy in the dynamics as a function of fragility of the systems.}, doi = {10.1007/s12039-0}, author = {Banerjee, Atreyee and Nandi, Manoj Kumar and Bhattacharyya, Sarika Maitra} } @article {44001, title = {Valorization of pomegranate peels: a biorefinery approach}, journal = {Waste and Biomass Valorization}, volume = {8}, year = {2017}, month = {JUN}, chapter = {1127-1137}, abstract = {

Recent studies have shown that pomegranate peels (PP) is a valuable source of valuable bioactive compounds, most of which can be converted into value-added products. We herein review this conversion process and provide an outline on the chemical composition of PP and the possible value-added products that can be produced from this commonly discarded agro-waste. We have also discussed its use as a substrate to produce medicinal compounds and bioactive phenolic compounds (e.g., phenolic acids, flavonoids, vitamin C, fertilizers, dietary fibers, and tannins) as well as its use in nanomaterial synthesis. Based on available evidence, it is obvious that PP has a wide variety of applications, and thus, developing an efficient system to utilize PP adequately will help to completely utilize its potential benefits. The biorefinery approach shows promising potential for efficient utilization of PP; however, additional studies should be conducted in this area. {\textcopyright} 2016, Springer Science+Business Media Dordrecht.

}, issn = {1877-2641}, doi = {10.1007/s12649-016-9668-0}, author = {Pathak, P. D. and Mandavgane, S. A. and Kulkarni, B. D.} } @article {44006, title = {Valorization of potato peel: a biorefinery approach}, journal = {Critical Reviews in Biotechnology}, year = {2017}, month = {JUN}, chapter = {1-13}, abstract = {

Potato is the fourth main crop consumed worldwide and is an important constituent in the human diet. Consequently, potato is widely used in food-processing industries. However, these industries generate massive amounts of potato peel (PP) as a by-product, which is usually considered a waste, and is discarded. Interestingly, recent research suggests that PP is a valuable source of bioactive compounds, which can be converted into value-added products. In this study, we review the physicochemical composition and valorization of PP. In addition to being used as a dietary fiber or medicine, the value-added products obtained by the fermentation of PP have multiple uses, including their use as adsorbents, biocomposites and packaging materials. These products can also be used in energy production, biopolymer film development, corrosion inhibition and the synthesis of cellulose nanocrystals. The biorefinery approach for PP will increase the value of this waste by producing an array of value-added products and reducing extensive waste generation.

}, keywords = {Bioactive compounds, Biorefinery, Potato peel, Valorization, Value-added products}, doi = {10.1080/07388551.2017.1331337}, author = {Pathak, P. D. and Mandavgane, S. A. and Puranik, N. M. and Jambhulkar, S. J and Kulkarni, B. D.} } @article {43551, title = {Vapor-liquid equilibrium data for binary mixtures of acetic acid plus anisole, acetone plus anisole, and isopropanol plus anisole at pressure 96.15 kPa}, journal = {Journal of Chemical and Engineering Data}, volume = {62}, year = {2017}, month = {MAR}, pages = {947-953}, abstract = {In this work, the vapor-liquid equilibrium (VLE) data have been generated at the local atmospheric pressure of 96.15 kPa for the binary systems acetic acid + anisole, acetone + anisole, and isopropanol + anisole. A circulation type apparatus was designed and developed with few modifications in one of the stills proposed in the literature. For the validation of the new apparatus, VLE data were generated for the known system of N,N-DMF + aniline and compared with the literature data. The VLE data, generated in Txy form for all pairs, were found to be consistent through the point-to-point consistency test. Activity coefficient models, Wilson, NRTL, and UNIQUAC, were fitted to these data using an objective function of minimizing the sum of deviation between experimental and calculated total pressures to estimate the binary interaction parameters. The model predictions with estimated parameters were compared with the experimental data and found appropriate.}, doi = {10.1021/acs.jced.6b00700}, author = {Mali, Nilesh A. and Mali, Pawan K. and Patil, Asmita P. and Joshi, Sunil S.} } @article {44407, title = {Vapor-liquid equilibrium data for binary mixtures of dimethyl carbonate with methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, and isoamyl acetate at 93.13 kPa}, journal = {Journal of Chemical and Engineering Data}, volume = {62}, year = {2017}, month = {DEC}, pages = {4356-4363}, abstract = {Isobaric vapor-liquid equilibrium (VLE) data was measured at the local atmospheric pressure of 93.13 kPa for the binary systems of dimethyl carbonate (DMC) with methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, and isoamyl acetate using a dynamic recirculation still. VLE data was generated in the form of T-x,y and was checked for thermodynamic consistency using the Herington area test, Van Ness test, and mean absolute deviation between experimental and calculated total pressure and vapor phase composition. Data for all pairs meet the criteria for thermodynamic consistency and were found suitable for process modeling. Binary interaction parameters for the Wilson, nonrandom two-liquid (NRTL), and universal quasichemical (UNIQUAC) activity coefficient models were determined using the objective function of minimizing the deviation between the experimental and the calculated vapor phase composition and total pressure. For all binary systems, Wilson, NRTL, and UNIQUAC models gave good predictions. Azeotropic behavior was observed for the isopropyl acetate-DMC pair at 357.8 K and 0.6 mole fraction of isopropyl acetate.}, doi = {10.1021/acs.jced.7b00704}, author = {Mali, Nilesh A. and Yadav, Satyajeet S. and Ghuge, Pravin D. and Joshi, Sunil. S.} } @article {44029, title = {Viable alternative in vitro system and comparative metabolite profiling of different tissues for the conservation of ceropegia karulensis}, journal = {Plant Cell, Tissue and Organ Culture}, year = {2017}, month = {AUG}, pages = {1-15}, type = {Article}, abstract = {Abstract: Ceropegia karulensis is an endemic and critically endangered plant of the Western Ghats from India. Exploitation of the tubers and poor regeneration from seed has narrowed distribution and propagation of the species. There is a need to develop in vitro propagation methods for C. karulensis to alleviate these problems. Here, we optimized callus induction, somatic embryogenesis and microtuberization from different seedling explants viz. cotyledonary leaf and root. The environmental scanning electron microscopy was used to observe somatic embryonic origin and their developmental stages. Highest callus proliferation was recorded with 2 {\textmu}M 6-benzylaminopurine and 1 {\textmu}M 2,4-dichlorophenoxyacetic acid. Somatic embryos derived from cotyledonary leaf explants were more proliferative than root explants. The combination of 2 {\textmu}M 6-benzylaminopurine, 2 {\textmu}M naphthalene acetic acid and 7\% sucrose in MS media resulted in highest microtuberization. Further, gas chromatography-mass spectrometry based metabolic profiling was carried out from native wild plants and in vitro callus tissues which identified various phytochemicals such as alkaloids, fatty acids, esters alcohols, etc. Multivariate analysis revealed the chemical disparities, where considerable variations were observed between native wild type and in vitro tissues, but no significant differences were found among in vitro callus from both root and cotyledonary explants. Overall, our results suggested that the production of various secondary metabolites found in C. karulensis was not affected by in vitro propagation and could be utilized in the conservation strategies for this plant. Graphical Abstract: [Figure not available: see fulltext.]}, keywords = {alkaloids, Metabolites}, doi = {10.1007/s11240-017-1292-6}, author = {Pandey, M. and Jayaramaiah, R.H. and Dholakia, B.B and Punekar, S.A. and Giri, A.P.} } @conference {45757, title = {VIMAL: A chemoinformatics toolkit for design of novel antiviral agents through textmining of scientific literature}, booktitle = {253rd National Meeting of the American-Chemical-Society (ACS) on Advanced Materials, Technologies, Systems, and Processes}, year = {2017}, month = {APR }, publisher = {Amer Chemical Soc, 1155 16TH ST, NW, Washington, DC 20036 USA}, organization = {Amer Chemical Soc, 1155 16TH ST, NW, Washington, DC 20036 USA}, address = {San Francisco, CA}, author = {Karthikeyan, Muthukumarasamy and Pahujani, Rakhi and Vyas, Renu} } @article {45688, title = {Visible-light active catechol-metal oxide carbonaceous polymeric material for enhanced photocatalytic activity}, journal = {Journal of Materials Chemistry A}, volume = {5}, year = {2017}, month = {JAN}, pages = {384-396}, type = {Article}, abstract = {

esigning new materials for sustainable energy and environmental applications is one of the prime focuses in chemical science. Here, an unprecedented visible-light active catechol-TiO2 carbonaceous polymer based organic-inorganic hybrid material was synthesized by a photosynthetic route. The visible light induced (\> 400 nm) photosynthetic polymerization of catechol led to the formation of carbonaceous polymeric deposits on the surface of TiO2. The band gap energy of hybrids was shifted to the visible region by orbital hybridization between 3d(Ti) of TiO2 and 2p(O), pi(C) of catechol. The Tauc plot clearly revealed that 1.0 wt\% catechol-TiO2 carbonaceous polymer remarkably tailored the optical band gap of TiO2 from 3.1 eV to 1.9 eV. The synthesized hybrid materials were thoroughly characterized and their photocatalytic activity was evaluated towards toxic Cr(VI) to relatively less toxic Cr(III) reduction under visible light irradiation (\> 400 nm), and solar light-driven H-2 production through water splitting. Very interestingly, the hybrid material showed 5- and 10-fold enhanced activity for photocatalytic Cr(VI) reduction and solar light-driven H-2 production respectively compared with pure TiO2. Moreover, the hybrid materials showed enhanced stability during photocatalysis. Thus, the simple photosynthetic strategy for developing light harvesting organic-inorganic hybrid materials can open up potential applications in energy and environmental remediation.

}, doi = {10.1039/c6ta07685h}, author = {Karthik, P. and Vinoth, R. and Selvam, P. and Balaraman, E. and Navaneethan, M. and Hayakawa, Y. and Neppolian, B.} } @article {43936, title = {Vitro study of novel microparticle based silk fibroin scaffold with osteoblast-like cells for load-bearing osteo-regenerative applications}, journal = {RSC Advances}, volume = {7}, year = {2017}, month = {MAY}, pages = {26551 - 26558}, type = {Article}, abstract = {Silk Fibroin (SF) is today considered to be one of the most favorable materials for bone tissue engineering. We have prepared novel SF microparticle based 3D scaffolds, with appropriate pore size, pore interconnectivity and porosity, excellent mechanical properties and tunable bioresorption, while retaining the inherent biocompatibility of SF. These properties make them ideal candidates for osteoregenerative applications. Here, we report the in vitro cell viability, cell adhesion and proliferation with osetoblastic differentiation of MG 63 osteoblast-like cell line on these scaffolds. In addition, we have also modified the surface of these scaffolds using collagen type I and chitosan biopolymers. Our results show that although the SF scaffold does support in vitro cell attachment, proliferation and differentiation, this performance can be further enhanced using the surface coating approach. Also, the ALP activity and bone mineralization was found to be particularly superior in the chitosan modified scaffolds.}, doi = {10.1039/c7ra03288a}, author = {Parekh, Nimisha Anant and Hushye, Chandni and Warunkar, Saniya and Gupta, Sayam Sen and Nisal, Anuya} } @article {44434, title = {Vanadium-based polyoxometalate complex as a new and efficient catalyst for phenol hydroxylation under mild conditions}, journal = {New Journal of Chemistry}, volume = {42}, year = {2018}, month = {APR}, pages = {5142-5152}, type = {Article}, abstract = {

An eco-compatible catalytic protocol for H2O2 induced hydroxylation of phenol (PH) to catechol (CT) and hydroquinone (HQ) in aqueous medium, using a polyoxovanadate (POV) complex as the catalyst, is described. The synthesis of the POV catalyst, with a new type of three dimensional framework, Na6(H2O)22(V10O28)2H2O (1) was accomplished by establishing a non-hydrothermal one-step methodology under mild conditions. The catalyst was characterized by elemental analysis, spectral studies, single crystal X-ray diffraction studies, and Brunauer{\textendash}Emmett{\textendash}Teller (BET) and TGA analysis. Under optimum conditions of reaction, conducted at ambient temperature, the phenol conversion reached up to 55.4\% providing a TON of 138. The catalyst could be recovered easily and recycled at least up to three cycles without significant change in activity. The developed methodology is operationally simple and free from halogenated solvents or any other hazardous additives.

}, issn = {11440546}, doi = { 10.1039/c7nj04433j}, author = {Sharma, Mitu and Saikia, Gangutri and Ahmed, Kabirun and Gogoi, Sandhya Rani and Puranik, Vedavati G. and Islam, Nashreen S.} } @article {45503, title = {Vapour{\textendash}liquid equilibrium study of binary mixtures of aniline with isopropanol, n -butanol and ethylene glycol at the local atmospheric pressure}, journal = {Indian Chemical Engineer}, year = {2018}, month = {OCT}, type = {Article}, abstract = {The present work analyses the vapour{\textendash}liquid equilibrium (VLE) behaviour of the binary systems of aniline with isopropanol, n-butanol and ethylene glycol. The isobaric VLE data have been generated at the local atmospheric pressure of 96.15 kPa for all the binary systems of aniline. A dynamic type vapour{\textendash}liquid circulating VLE still was used for generating the data. Calibration curves were generated using mole fraction and refractive index data for all pairs for composition measurement. The VLE data, generated in T-x,y form for all pairs, were found thermodynamically consistent through the Herington area test and the mean absolute deviation test. Activity coefficient models, Wilson, NRTL and UNIQUAC, were fitted to the data to estimate binary interaction parameters using an objective function of minimising the deviation between the experimental and the calculated total pressure and vapour composition. The experimental data were compared with the model predictions with the estimated parameters and the model predictions were found appropriate. The binary system of aniline and ethylene glycol was found to exhibit azeotropic behaviour at 0.61 mole fraction aniline and 445.1 K.}, doi = {10.1080/00194506.2018.1529634}, author = {Mali, P.K. and Mali, N.A. and Yadav, S.S. and Joshi, S.S.} } @article {44623, title = {Visible light mediated desilylative C(sp(2))-C(sp(2)) cross-coupling reactions of arylsilanes with aryldiazonium salts under Au(i)/Au(iii) catalysis}, journal = {Chemical Communications}, volume = {54}, year = {2018}, month = {JUL}, pages = {7223-7226}, abstract = {

Desilylative C(sp(2))-C(sp(2)) cross-coupling reactions of arylsilanes with aryldiazonium salts under Au(i)/photoredox catalysis have been reported. The addition of Cu-salts as catalysts was found to be crucial for the success of this transformation.

}, issn = {1359-7345}, doi = {10.1039/c8cc03925a}, author = {Chakrabarty, Indradweep and Akram, Manjur O. and Biswas, Suprakash and Patil, Nitin T.} } @article {44369, title = {Visible-light-mediated eosin Y photoredox-catalyzed vicinal thioamination of alkynes: radical cascade annulation strategy for 2-substituted-3-sulfenylindoles}, journal = {European Journal of Organic Chemistry}, year = {2018}, month = {MAY}, pages = {2117-2121}, type = {Article}, abstract = {An organic dye photoredox-catalyzed regiospecific radical cascade annulation strategy of 2-alkynyl-azidoarenes to generate 3-sulfenylindoles via vicinal thioamination of alkynes at room temperature, mediated by visible light, was developed. The method requires mild conditions, including visible light as a traceless green energy source, room temperature, eosin Y organic dye as a photoredox catalyst, ambient air as oxidant, and easily available starting materials to provide a green, efficient, metal- and strong-oxidant-free synthesis of 3-sulfenylindoles with broad substrate scope through vicinal thioamination of alkynes.}, doi = {10.1002/ejoc.201800287}, author = {Tambe, Shrikant D. and Rohokale, Rajendra S. and Kshirsagar, Umesh A.} } @article {46238, title = {Valorization of oceanic waste biomass: a catalytic perspective}, journal = {Chemical Record}, volume = {19}, year = {2019}, month = {SEP}, pages = {1995-2021}, type = {Article}, abstract = {

Efficacious waste utilization is vital in context of sustainability. The past decade has witnessed attempts of usage of land biomass and wastes for various applications, contributing towards a sustainable society. Exploitation of the marine biomass, which does not compete with habitation and food production like land biomass has been largely unnoticed and therefore not being utilized judiciously. Researchers have mainly exploited these resources as functional materials having significant potential applications. However, a catalytic perspective for the valorisation of these polymers arising from oceanic waste widens their scope and ameliorates its use. The objective of the present review is to demonstrate the effectiveness of chitin/chitosan as a catalyst and as a feedstock for deriving important fuels and chemicals. It displays all the reactions heterogeneously catalyzed by them along with the strategic methodology. Their important catalytic organic transformations attempted so far, have also been discussed. The future perspectives are also presented which if inculcated would improve the value addition of the waste, paving a way for greener and imperishable world.

}, doi = {10.1002/tcr.201800195}, author = {Lucas, Nishita and Athawale, Anjali A. and Rode, Chandrashekhar V.} } @article {46230, title = {Vanadium-based highly active and selective catalysts for oxidative dehydrogenation of ethyl lactate to ethyl pyruvate}, journal = {Applied Catalysis A: General}, volume = {587}, year = {2019}, month = {SEP}, type = {Article}, abstract = {

Pyruvates are important intermediates for various bioactive and pharmaceutical molecules. Synthesis of pyruvates is challenging due to low selectivity, as the pyruvates are prone to polymerisation. In the present work, oxidative dehydrogenation of ethyl lactate to ethyl pyruvate was carried out under very mild conditions using vanadium-based homogeneous and heterogeneous catalysts in the presence of aqueous\ t-butyl hydroperoxide as an oxidant. Homogenous vanadium-based catalyst, VO(acac)2\ in acetonitrile solvent, gave excellent conversion (upto 83\%) with 100\% selectivity to ethyl pyruvate at room temperature. However, the heterogeneous catalyst, V2O5\ exhibited very high activity for oxidative dehydrogenation of ethyl lactate only at higher temperature (80 {\textdegree}C). At higher temperature, significant TBHP decomposition was observed if all TBHP was added in one lot. In case of ethyl lactate dehydrogenation using V2O5\ catalyst at 80 {\textdegree}C with two equivalents TBHP, 60\% ethyl lactate conversion with 100\% TBHP conversions were observed after 5 h when all TBHP was added initially in the reaction mixture. However, the ethyl lactate conversion at 80 {\textdegree}C, after 5 h increased to 72\% when the same amount of TBHP was added batch wise over a period of 4 h, indicating improved conversion of TBHP to ethyl pyruvate. The heterogeneous catalyst, V2O5\ exhibited up to 98\% conversion with 100\% ethyl pyruvate selectivity at 80 {\textdegree}C after 10 h with 3 equivalent TBHP added batch wise. The homogeneous catalyst could not be reused while V2O5\ could be successfully recycled five times without catalytic performances loss. Oxidation proceeds by radical mechanism, as proved by experiment with radical scavenger.

}, doi = {10.1016/j.apcata.2019.117246}, author = {Doke, Dhananjay and Khomane, Sonali B. and Pandhare, Swati and Dongare, Mohan K. and Dumeignil, Franck and Umbarkar, Shubhangi} } @article {46102, title = {Visible light mediated, metal and oxidant free highly efficient cross dehydrogenative coupling (CDC) reaction between quinoxalin-2(1H)-ones and ethers}, journal = {New Journal of Chemistry}, volume = {43}, year = {2019}, month = {MAY}, pages = {7403-7408}, type = {Article}, abstract = {

The efficient and metal free, white light mediated 3C alkylation of quinoxalin-2(1H)-ones via a cross dehydrogenative coupling reaction with cyclic ethers using eosin Y as a photocatalyst is described. This reaction has broad substrate scope and strong functional group tolerance with good to excellent yields.

}, issn = {1144-0546}, doi = {10.1039/c9nj00075e}, author = {Mane, Kishor D. and Kamble, Rohit B. and Suryavanshi, Gurunath} } @article {46265, title = {Visual exploration of microbiome data}, journal = {Journal of Biosciences}, volume = {44}, year = {2019}, type = {Review}, abstract = {

A dramatic increase in large-scale cross-sectional and temporal-level metagenomic experiments has led to an improved understanding of the microbiome and its role in human well-being. Consequently, a plethora of analytical methods has been developed to decipher microbial biomarkers for various diseases, cluster different ecosystems based on microbial content, and infer functional potential of the microbiome as well as analyze its temporal behavior. Development of user-friendly visualization methods and frameworks is necessary to analyze this data and infer taxonomic and functional patterns corresponding to a phenotype. Thus, new methods as well as application of pre-existing ones has gained importance in recent times pertaining to the huge volume of the generated microbiome data. In this reveiw, we present a brief overview of some useful visualization techniques that have significantly enriched microbiome data analytics.

}, doi = {10.1007/s12038-019-9933-z}, author = {Kuntal, Bhusan K. and Mande, Sharmila S.} } @article {47166, title = {Vivo wound healing performance of halloysite clay and gentamicin-incorporated cellulose ether-PVA electrospun nanofiber mats}, journal = {ACS Applied Bio Materials}, volume = {2}, year = {2019}, month = {SEP}, pages = {4324{\textendash}4334}, type = {Article}, abstract = {

Wound healing is a dynamic and complex process that requires a suitable environment to enhance the rapid healing process. In this context, fabrications of nanofibrous materials with antibiotic and antibacterial properties are becoming extremely important. In this present work, we report on the fabrication and characterization of electro-spun cellulose ether-PVA nanofiber mats loaded with halloysite clay (HNT) and gentamicin sulfate (GS) for faster wound healing applications. The morphology of nanofiber mats was examined by SEM and TEM. The average diameter of the nanofiber mats were in the range of 325 {\textpm} 30 nm. The physicochemical characterizations were done by FT-IR and XRD, which reveal the presence of HNT and GS into the nanofibers. The incorporation of halloysite gave good mechanical strength to the nanofiber mats. Swelling studies indicated the hydrophilicity of the mats. In vitro studies revealed that HNTs are nontoxic to L929 fibroblast cells and also promote cell growth and proliferation. The antibacterial property of HNT was also studied. The slow release of GS from the nanofiber mats was observed for a period of 18 days. The in vivo wound healing studies on the wistar rats for 21 days revealed the wound healing faster within 2 weeks by the incorporation of HNT and GS into the nanofiber mats and hence these nanofiber mats show great potential in acute and chronic wound healing applications.

}, doi = {10.1021/acsabm.9b00589}, author = {Wali, Ashwini and Gorain, Mahadeo and Inamdar, Satish and Kundu, Gopal and Badiger, Manohar V.} } @article {44433, title = {VSe2-reduced graphene oxide as efficient cathode material for field emission}, journal = {Journal of Physics and Chemistry of Solids }, volume = {128}, year = {2019}, month = {MAY}, pages = {384-390}, type = {Journal Article}, abstract = {

Field emission properties of pristine VSe2 and its hybrid with reduced graphene oxide (RGO) have been investigated in detail. Promising field emission performance were noted with lower values of turn-on and threshold fields of \~{}1.3 V μm-1 and 2.12 V μm-1 respectively for the VSe2/RGO hybrid which is much more superior than that of pristine VSe2 emitter and other 2D materials. Density Functional Theory (DFT) simulations have also been performed to qualitatively support our experimental observations through demonstration of Density of States and computation of work function for pristine VSe2 and hybrid VSe2/RGO. The lowering of work function and appearance of additional states near Fermi level from carbon p orbital of RGO is responsible for superior field emission characteristics in hybrid VSe2/RGO compared to pristine VSe2 which supports our experimental observations. Our experimental data and theoretical insight from electronic structure simulations strongly infer that the synthesized hybrid VSe2/RGO has the potential to be tailored as efficient and high performance cathode material in field emission based devices.

}, keywords = {cathode material, Chalcogenide, Density functional theory, field emission, Vanadium diselenide, Work function}, issn = {223697}, doi = {10.1016/j.jpcs.2018.02.020}, author = {Ratha, S.}, editor = {Bankar, P.} } @article {45504, title = {Valorization of cow urine and dung: A model biorefinery (2018)}, journal = {Waste and Biomass Valorization}, volume = {11}, year = {2020}, month = {MAR}, pages = {1-14}, type = {Article}, abstract = {

Cow is one of the most common livestock of Indian farmers. Small farm households are strongly dependent on livestock for income as it contributes nearly 16\% of their total earnings. As much as two-thirds of rural community depends on livestock for their livelihood. Farmers in India maintain a hybrid farming system, that is, a combination of crop cultivation and livestock, which are complementary to each other. Traditionally, the output of one enterprise is the input of another enterprise. Recent research suggests that in addition to milk, urine and dung obtained from cow are valuable resources of bioactive compounds, which can be converted into value-added products. In this review, we provide an outline for the physicochemical composition and valorization of cow urine and dung. They are utilized in agriculture as a pesticide, manure, and acts as a soil rejuvenator. Cow dung is used for bio energy production by fermentation and gasification. Medicinal and cosmetic products are prepared following ayurvedic formulations described in {\textquoteleft}Panchagavya{\textquoteright}. Cow dung ash is used as adsorbent, construction material, mosquito repellent and electrolyte. A case study of manufacturing unit producing arrays of products from cow urine and dung is also presented.

}, keywords = {Bio gas, Cow dung, Cow urine, Waste utilization}, doi = {10.1007/s12649-018-0406-7}, author = {Mandavgane, S. A. and Kulkarni, B. D.} } @article {46978, title = {Variations in activity of Ru/TiO(2 )and Ru/Al2O3 catalysts for CO2 hydrogenation: an investigation by in-situ infrared spectroscopy studies}, journal = {Molecular Catalysis}, volume = {482}, year = {2020}, month = {FEB}, pages = {110700}, type = {Article}, abstract = {

CO2 hydrogenation to methane, an important reaction strategically and also for value adding to CO2, is investigated on two different catalysts, Ru supported on alumina as well as titania to understand better low temperature activity of Ru/TiO2 catalyst. In-situ infrared studies are carried out in three different steps, viz., (i) CO2 adsorption on fully reduced catalyst (ii) reaction of these adsorbed species with gaseous H-2 and (iii) under co-feed of CO2 and H-2, at different temperatures. On Ru/Al2O3 catalyst, CO2 reacts with hydroxyls on the support surface to form carbonate and adsorbs reductively on metal as CO. Further reduction to formate and methyl species occurs on reaction with H. Small concentration of the reactive intermediate formyl forms only at high temperatures. Whereas, bare TiO2 itself seems capable of reductive adsorption of CO2 as formate indicating enhanced reducibility of titania based catalyst. Formyl groups are observed at low temperatures in Ru/TiO2 in step (ii), which further forms methyl and gaseous methane at much lower temperatures when compared to alumina catalyst. Highly reactive CO species loosely bound to metal-support interface observed at high temperatures, which is not present on Ru/Al2O3 catalyst also makes this catalyst superior. In comparison, linearly bound CO seen in alumina catalyst is not as reactive.

}, keywords = {CO2 hydrogenation, In-situ infra red spectroscopy, Ru/Al2O3, Ru/TiO2}, issn = {2468-8231}, doi = {10.1016/j.mcat.2019.110700}, author = {Dongapure, Pavan and Bagchi, Sayan and Mayadevi, S. and Devi, R. Nandini} } @article {46718, title = {Vinylogous michael addition of 3-alkylidene-2-oxindoles to beta,gamma-unsaturated alpha-keto esters by bifunctional cinchona alkaloids}, journal = {European Journal of Organic Chemistry}, volume = {2020}, year = {2020}, month = {SEP }, pages = {5690-5694}, type = {Article}, abstract = {

A highly enantioselective vinylogous Michael addition of 3-alkylidene-2-oxindoles with beta,gamma-unsaturated alpha-keto esters using a bifunctional tertiary-amine thiourea catalyst is demontsrated. The challenging Michael reaction with the beta,gamma-unsaturated alpha-keto esters has been accomplished due to the synchronized H-bond guided dual activation of vinylogous nucleophile and electrophile by catalyst. The reaction afforded product in high yield while resulting in excellent stereocontrol (\> 19:1E/Zand upto 99 \%ee).

}, keywords = {3-Alkylidene-2-oxindoles, Asymmetric synthesis, beta, gamma-Unsaturated alpha-keto esters, Michael adduct, Vinylogous Michael addition}, issn = {1434-193X}, doi = {10.1002/ejoc.202000835, Early Access Date = SEP 2020}, author = {Jaiswal, Manish K. and Kumar, Rajesh and Singh, Sanjay and Jain, Shailija and Vanka, Kumar and Singh, Ravi P.} } @article {46674, title = {Visual exploration of microbiome data (vol 44, 119, 2019)}, journal = {Journal of Biosciences}, volume = {45}, year = {2020}, month = {OCT}, pages = {134}, type = {Correction}, abstract = {

In the October 2019 Special Issue of theJournal of Bioscienceson Current Trends in Microbiome Research, in the Review article titled {\textquoteleft}{\textquoteright}Visual exploration of microbiome data{\textquoteright}{\textquoteright} by Bhusan K. Kuntal and Sharmila S. Mande (DOI: 10.1007/s12038-019-9933-z; Vol. 44, Article No. 119), affiliation 3 for Bhusan K. Kuntal was incorrectly mentioned as {\textquoteleft}{\textquoteright}Academy of Scientific and Innovative Research, CSIR-National Chemical Laboratory Campus, Pune 411008, India{\textquoteright}{\textquoteright}. The correct affiliation should read as {\textquoteleft}{\textquoteright}Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India{\textquoteright}{\textquoteright}.

}, issn = {0250-5991}, doi = {10.1007/s12038-020-00103-9}, author = {Kuntal, Bhusan K. and Mande, Sharmila S.} } @article {47102, title = {Visible-light-induced controlled oxidation of N-substituted 1,2,3,4-tetrahydroisoquinolines for the synthesis of 3,4-dihydroisoquinolin-1(2h)-ones and isoquinolin-1(2H)-ones}, journal = {Advanced Synthesis \& Catalysis}, volume = {363}, year = {2021}, month = {MAR }, pages = {1390-1400}, type = {Article}, abstract = {

A visible light-rose bengal-TBHP mediated, controlled oxidation of N-substituted 1,2,3,4-tetrahydroisoquinolines is developed for the synthesis of 3,4-dihydroisoquinolin-1(2H)-ones and isoquinolin-1(2H)-ones. The present method feature{\textquoteright}s a broad substrate scope, good functional group tolerances, and the products were prepared in good to excellent yields. The developed methodology further demonstrated in the synthesis of isoindolo[2,1-b] isoquinolin-5(7H)-one (topoisomerase-I inhibitor).

}, keywords = {2, 3, 4-Dihydroisoquinolin-1(2H)-one, 4-tetrahydroisoquinolines, Isoquinolin-1(2H)-one, N-substituted 1, Oxidation, Photocatalysis}, issn = {1615-4150}, doi = {10.1002/adsc.202001266, Early Access Date = JAN 2021}, author = {Bansode, Ajay H. and Suryavanshi, Gurunath} } @article {48162, title = {Versatile chemistry of six-membered NHC with boranes: bromination at sp(3) borane, activation of the B-H bond of HBpin, and ring expansion of NHC}, journal = {Dalton Transactions}, volume = {51}, year = {2022}, month = {OCT}, pages = {14452-14457}, type = {Article}, abstract = {

The NHC.borane chemistry has been majorly restricted to imidazol-2-ylidene classes of carbenes. In our previous communication, we reported the synthesis of 6-SIDipp center dot BH3 [6-SIDipp = 1,3-di(2,6-diisopropylphenyl) tetrahydropyrimidine-2-ylidene] and its electrophilic substitution reaction with iodine. Here, we have shown selective bromination of a 6-SIDipp stabilized sp(3) B-H bond. Treatment of 1.2 equivalents of N-bromosuccinamide with 6-SIDipp center dot BH3 gives a mixture of mono- and disubstituted products 6-SIDipp center dot BH2Br (1) and 6-SIDipp center dot BHBr2 (2). However, the reactions with alkyl bromides or carbon tetrabromide resulted in 6-SIDipp center dot BH2Br (1) selectively. Exploration of the chemistry of 6-SIDipp with BHCl2 and 9-BBN (9-borabicyclo[3.3.1]nonane) led to mono-6-SIDipp adducts 3 and 6a. Furthermore, 6a undergoes ring expansion to afford a seven-membered product, 6b, under mild conditions. Unlike BHCl2 or 9-BBN, the B-H bond of HBpin undergoes oxidative addition upon reaction with 6-SIDipp, epitomizing the first example (7) of a B-H bond insertion at NHCs. The analogous reactivity with HBcat led to a tetra-hydropyrimidinium salt with B(cat)(2) as a counteranion (8).

}, issn = {1477-9226}, doi = {10.1039/d2dt01707e}, author = {Kundu, Gargi and Dixit, Ruchi and Tothadi, Srinu and Vanka, Kumar and Sen, Sakya S.} } @article {48416, title = {Viscoelastic covalent organic nanotube fabric via macroscopic entanglement}, journal = {Journal of the American Chemical Society}, volume = {144}, year = {2022}, month = {SEP }, pages = {16052-16059}, type = {Article}, abstract = {

Covalent organic nanotubes (CONTs) are one-dimensional porous frameworks constructed from organic building blocks via dynamic covalent chemistry. CONTs are synthesized as insoluble powder that restricts their potential applications. The judicious selection of 2,2{\textquoteright}-bipyridine-5,5{\textquoteright}-dicarbaldehyde and tetraaminotriptycene as building blocks for TAT-BPy CONTs has led to constructing flexible yet robust and self-standing fabric up to 3 mu m thickness. The TAT-BPy CONTs and TAT-BPy CONT fabric have been characterized by solid-state one-dimensional (1D) C-13 CP-MAS, two-dimensional (2D) C-13-H-1 correlation NMR, 2D H-1-H-1 DQ-SQ NMR, and 2D N-14-H-1 correlation NMR spectroscopy. The mechanism of fabric formation has been established by using high-resolution transmission electron microscopy and scanning electron microscopy techniques. The as-synthesized viscoelastic TAT-BPy CONT fabric exhibits high mechanical strength with a reduced modulus (E-r) of 8 (+/- 3) GPa and hardness (H) of 0.6 (+/- 0.3) GPa. Interestingly, the viscoelastic fabric shows time-dependent elastic depth recovery up to 50-70\%.

}, issn = {0002-7863}, doi = {10.1021/jacs.2c06133}, author = {Koner, Kalipada and Das, Susobhan and Mohata, Shibani and Duong, Nghia Tuan and Nishiyama, Yusuke and Kandambeth, Sharath and Karak, Suvendu and Reddy, C. Malla and Banerjee, Rahul} } @article {48436, title = {Viscoelastic liquid from regenerated silk fibroin in the silk i conformation: a writeable and shapeable material}, journal = {ACS Applied Polymer Materials}, volume = {4}, year = {2022}, month = {JUN}, pages = {4699{\textendash}4708}, type = {Article}, abstract = {

Regenerated silk fibroin (RSF) has acquired enormous attention because of its exceptional toughness, strength, and biocompatible nature. These properties make RSF a potential candidate for the fabrication of different types of materials. However, processing even a dilute aqueous solution of RSF leads to a conformational transformation from a random coil/helix-rich (silk I) to a beta-sheetrich (silk II) state. As a consequence, RSF tends to form aggregates and loses its toughness. Working in a direction to address this problem, an aqueous solution of regenerated silk fibroin has been modified with a dual layer of polyethylenimine (PEI) and a PEG-based polymer surfactant (PS). Upon freeze-drying, the RSF-polymer complex forms a solvent-free RSF bioconjugate system and exhibits a soft solid to liquid melting transition at similar to 45 degrees C. The sequential modification with PEI and PS preserves the native-like random coil conformation of RSF up to at least 8 months of storage by not allowing interchain interactions that can lead to aggregation. Rheological and small-angle X-ray scattering measurements show that the solvent-free system is viscoelastic and exhibits a higher order microstructure mediated by the packing of the PS chains, respectively. Temperature-dependent soft solid-liquid-like dual behavior offers applications in injection-based writing, compression molding, and shaping RSF bioconjugates into various types of geometries. Furthermore, the mechanical properties of the RSF bioconjugate system can be modulated by crosslinking with glutaraldehyde vapor at 50 degrees C.

}, keywords = {RSF liquid, RSF soft solid, silk I conformation, silk liquid, viscoelastic}, issn = {2637-6105}, doi = {10.1021/acsapm.2c00290}, author = {Kumar, Raj and Joseph, Emmanuel and Chaudhari, Atul and Nisal, Anuya and Sharma, Kamendra P.} } @article {48078, title = {Visible light-promoted, photocatalyst-free C(sp(2))-H bond functionalization of indolizines via EDA complexes}, journal = {European Journal of Organic Chemistry}, volume = {2022}, year = {2022}, month = {MAY}, pages = {e202200261}, type = {Article}, abstract = {

The catalyst and additive-free, photo-driven cross dehydrogenative coupling (CDC) reaction initiated by electron donor-acceptor (EDA) complexes between electron rich indolizines and electron poor quinones has been demonstrated. This green transformation reveals the advantages of operational simplicity, mild reaction conditions and good functional group tolerances.

}, keywords = {Blue LED, CDC, EDA, Indolizine, Quinone}, issn = {1434-193X}, doi = {10.1002/ejoc.202200261}, author = {Mane, Kishor D. and Rupanawar, Bapurao D. and Suryavanshi, Gurunath} } @article {47827, title = {Vitrimers based on bio-derived chemicals: overview and future prospects}, journal = {Chemical Engineering Journal}, volume = {433}, year = {2022}, month = {APR}, pages = {133261}, type = {Article}, abstract = {The perspective of using recyclable and biobased materials in the vitrimeric concept is attractive, in view of the regulatory guidelines and pressing need to reduce CO2-emissions. The expansion of viable bio-based polymeric materials is gaining increased attention to achieve sustainable development goals. Although durability, cost, and performance still limit their real life applications, these limitations can be overcome through state-of-the-art bio-vitrimeric materials displaying thermoset like mechanical and thermal properties as well as thermoplastic like malleable and thus recyclable properties. Bio-derived chemicals based vitrimers can be of advantage, where material design is made from scratch, allowing to plan material properties in line with their future life cycle from the very beginning. This article emphasizes the current needs of vitrimers based on bio-derived chemicals, including their recycling, reprocessing, and self-healing properties, along with their advantages and potential obstacles from todays{\textquoteright} perspective. The article also identifies potential bio-derivatives as attractive building blocks for vitrimers because of their potential for sustainability.}, keywords = {Recycling, Self-healing, Sustainable materials, Vitrimers}, issn = {1385-8947}, doi = {10.1016/j.cej.2021.133261}, url = {https://www.sciencedirect.com/science/article/pii/S1385894721048361}, author = {Balaji Krishnakumar and Andrea Pucci and Prakash P. Wadgaonkar and Indresh Kumar and Wolfgang H. Binder and Sravendra Rana} } @article {48746, title = {Visible-light-active unsymmetrical squaraine dyes with 1 V of open-circuit voltage for dye-sensitized solar cells}, journal = {ChemPhotoChem}, volume = {7}, year = {2023}, month = {MAY}, type = {Article}, abstract = {

A series of alkyl-group-functionalized, aniline- and indoline-donor-based, unsymmetrical visible-light-active squaraine dyes, AM1-3, were designed and synthesized. Dye-sensitized solar cell (DSSC) devices were fabricated with both I-/I-3(-) and [Cu(tmby)(2)](+/2+) electrolytes. DSSC devices sensitized with the AM1 and AM2 dyes showed relatively high-power conversion efficiency of 7.44 \% and 7.22 \%, respectively with I-/I-3(-) in the absence of chenodeoxycholic acid (CDCA) than those of the AM3 dye (5.41 \%). The [Cu(tmby)(2)](+/2+) electrolyte along with poly(3,4-ethylenedioxythiophene) (PEDOT) as cathode material showed excellent open-circuit potentials (V-OC) of 1030, 1025, and 1001 mV with the DSSC efficiency of 8.05 \%, 7.96 \%, and 5.84 \%, respectively, for the AM1, AM2, and AM3 dyes in the absence of CDCA. Here, the AM1 dye exhibited the maximum DSSC efficiency of 8.05 \% and V-OC of 1030 mV, which is the highest obtained efficiency and V-OC for the visible-light active zwitterionic unsymmetrical-squaraine dye with copper-based electrolyte.

}, keywords = {Cu electrolytes, dihedral angle, Dye-sensitized solar cells, open circuit voltage, squaraine dyes}, issn = {2367-0932}, doi = {10.1002/cptc.202200328}, author = {Singh, Amrita and Kumar Singh, Ambarish and Dixit, Ruchi and Vanka, Kumar and Krishnamoorthy, Kothandam and Nithyanandhan, Jayaraj} } @article {48911, title = {Visible-light-active unsymmetrical squaraine dyes with pyridyl anchoring groups for dye-sensitized solar cells}, journal = {Langmuir}, volume = {40}, year = {2023}, month = {DEC }, pages = {251-263}, type = {Article}, abstract = {

Visible-light-active alkyl group-wrapped unsymmetrical squaraine dyes SD1-SD3 were synthesized, featuring an indoline donor and pyridine and carboxylic acid anchoring groups. Their photophysical, electrochemical, and photovoltaic characteristics were examined by fabricating a dye-sensitized solar cell (DSSC) device. Both carboxylic acid and pyridine anchoring groups containing squaraine dyes SD3 and SD2 possess similar photophysical and electrochemical characteristics. However, their photovoltaic performances were completely different. The SD3 dye with the carboxylic acid anchoring group displayed a DSSC device efficiency of 7.20\% (V-OC 0.81 V; J(SC) 12.29 mA/cm(2)) using iodolyte (I-/I-3(-)) electrolyte, compared to SD1 (V-OC 0.659 V; J(SC) 4.97 mA/cm(2); and eta - 2.34\%) and SD2 (V-OC 0.629 V; J(SC) 1.68 mA/cm(2); and eta - 0.84\%), which were featured with pyridyl anchoring groups. These results were attributed to dye loading on the Lewis and Br \& oslash;nsted acidic sites of TiO2 and the importance of aggregated structures for photocurrent generation. In the incident photon-to-current efficiency (IPCE) analysis, SD1 dye-sensitized devices exhibited photocurrent generation from both monomeric and aggregated dyes on the TiO2 surface. In contrast, SD2 showed photocurrent generation solely from aggregated states. Despite the introduction of long alkyl chains to reduce dye aggregation and charge recombination, the results indicated preferential charge injection from only the aggregated SD2 dye on TiO2. Fluorescence-quenching experiments indicated an efficient charge transfer from the aggregated SD2 dye to TiO2 compared to that of the monomeric dye. Cosensitization, a method to enhance the light-harvesting efficiency and photocurrent generation in DSSCs, was explored by simultaneously cosensitizing pyridyl-based dyes (SD1 and SD2) with a blue-colored carboxylic acid-based squaraine dye SD4. IPCE analysis demonstrated that both SD1 and SD4 contributed to generating a photocurrent of 9.11 mA/cm(2). The sequential cosensitization of SD1 and SD4 with the coadsorbent CDCA showed the highest performance, with a V-OC of 0.663 V, a J(SC) of 11.43 mA/cm(2), and an efficiency (eta) of 5.20\%.

}, keywords = {co-sensitization, Design, Emmision, Fluorescent Dyes, High-Efficiency, Organic Dye, Ring}, issn = {0743-7463}, doi = {10.1021/acs.langmuir.3c02474}, author = {Deshmukh, Shivdeep Suresh and Maibam, Ashakiran and Krishnamurty, Sailaja and Krishnamoorthy, Kothandam and Nithyanandhan, Jayaraj} } @article {48974, title = {Valorizing biomass waste glycerol to fuel additive at room temperature using a nanostructured WO3/Nb2O5 catalyst}, journal = {Catalysis Communications }, volume = {186}, year = {2024}, month = {JAN}, type = {Article}, abstract = {

We developed a nanostructured catalyst consisting of WO3 nanoparticles and Nb2O5 nanorods for efficient glycerol acetalization to produce a fuel additive (solketal) at room temperature. Particularly, the WO3/Nb2O5 nanocatalyst calcined at 400 degrees C (WO3/Nb2O5-4) contains W5+ species and optimum acid sites, which enhanced glycerol conversion (92.3\%) with 95.6\% of solketal selectivity at room temperature. The structure stability of the WO3/Nb2O5-4 catalyst during the reaction is showcased by hot-filtration study and XRD/XPS characterization. However, the inadequate regeneration of the Bronsted acid sites led to a gradual decrease in the recyclable activity of the WO3/Nb2O5-4 catalyst.

}, keywords = {Bronsted-Lewis acid sites, Fuel additive, Room-temperature glycerol acetalization, W5+species}, issn = {1566-7367}, doi = {10.1016/j.catcom.2023.106827}, author = {Putla, Suresh Babu and Subha, P. and Swapna, Bhattu and Singh, Nittan and Sudarsanam, Putla} } @article {49402, title = {Variations in packing as a function of side chains in random copolymers and its impact on charge carrier mobility}, journal = {Macromolecular Chemistry and Physics}, year = {2024}, month = {OCT }, type = {Article; Early Access}, abstract = {

Homopolymers and alternating copolymers of conjugated molecules exhibit impressive performance in electronic devices. Despite the well-established procedures, the synthesis of alternating copolymers using three monomers is not as easy as random copolymers. Besides facile synthesis, the random copolymers can match the performance of alternating copolymers in electronic devices. Herein, random copolymers are designed and synthesized comprising thienoisoindigo (TIIG), diketopyrrolopyrrole (DPP), and thiophene. The DPP monomers installed with various side chains including branched alkyl chain, branched alkyl chain with ester functionality, linear oligo ethylene glycol, and siloxane terminated alkyl chain are incorporated into the polymers (P1, P2, P3, and P4, respectively). All the thermally stable, low bandgap random copolymers exhibited strong H-type aggregation in thin film. The relationship between thin film microstructure originating from diverse side chains and the charge transport in organic field effect transistors (OFETs) is investigated. All the random copolymers exhibited predominantly p-type charge transport and a maximum hole mobility of 2 x 10-2 cm2 V-1s-1 is observed for P3. The packing of all the polymers is examined theoretically by density functional theory (DFT) and compared with experimental values obtained from grazing incident X-ray diffraction (GIXRD). Various side chains (hydrophilic and hydrophobic) affect molecular packing of random polymers which ultimately affects its thin film morphology and semiconducting performances. Linear chains provide better interchain packing by pi-pi stacking compared to bulky branched side chains. The incorporation of heteroatoms and polar groups into the side chain further enhances the interchain interactions. image

}, keywords = {diketopyrrolopyrrole, organic field effect transistor, random polymer, side chain engineering, thienoisoindigo}, issn = {1022-1352}, doi = {10.1002/macp.202400294}, author = {Swain, Gitanjali and Kumar, Subramani and Samudre, Nikhil S.} } @article {49249, title = {Viscosity effects on the dynamics of diols and diol-based deep eutectic solvents}, journal = {Photochemistry and Photobiology}, volume = {100}, year = {2024}, month = {JUL}, pages = {946-955}, type = {Article}, abstract = {

Diols, characterized by the presence of two hydroxyl groups, form extended hydrogen-bonded networks. Increasing hydrocarbon chain length is known to elevate the viscosity of diols. Given the established influence of viscosity on solvent dynamics, it becomes imperative to comprehend the impact of viscosity on the fluctuation dynamics within diols and establish connections with hydrogen bond formation and breaking dynamics. In this study, we employ two-dimensional infrared spectroscopy to investigate the viscosity dependence of the structural evolution dynamics in three diols with varying chain lengths. Complementing our experimental approach, molecular dynamics simulations are conducted to extract hydrogen bond lifetimes. Our findings reveal a linear correlation between bulk viscosity, solvent fluctuation timescales, and hydrogen bond lifetimes. Notably, the selected diols exhibit the capability to form deep eutectic solvents upon mixing with choline chloride at specific molar ratios. In contrast to molecular solvents like diols, deep eutectic solvents are characterized by the formation of heterogeneous nanodomains, comprising various intercomponent hydrogen-bonded networks. Interestingly, our observations indicate that while the fluctuation dynamics decelerate with increasing bulk viscosity in diol-based deep eutectic solvents, the relationship between viscosity and dynamics is not linear, in contrast to the observed linearity in diols. This nuanced understanding contributes to the broader comprehension of the interplay between viscosity and dynamics in both molecular and deep eutectic solvents. We investigate the impact of viscosity on structural evolution dynamics in diols with varying chain lengths. Employing two-dimensional infrared spectroscopy and molecular dynamics simulations, we explore the relationship between bulk viscosity, solvent fluctuation timescales, and hydrogen bond lifetimes. We report a linear correlation in diols between viscosity, fluctuation timescales, and hydrogen bond lifetimes. Diols also form deep eutectic solvents, characterized by heterogeneous nanodomains. While fluctuation dynamics slow down with increasing bulk viscosity in diol-based deep eutectic solvents, the relationship between viscosity and dynamics is nonlinear, contrasting with diols{\textquoteright} linearity. This understanding enhances comprehension of viscosity-dynamics interplay in molecular and deep eutectic solvents.image

}, keywords = {Dynamics, Hydrogen bond, solvent, spectroscopy, viscosity}, issn = {0031-8655}, doi = {10.1111/php.13950}, author = {Chatterjee, Srijan and Deshmukh, Samadhan H. and Chowdhury, Tubai and Bagchi, Sayan} } @article {49031, title = {Visible, far-red, and near-infrared active unsymmetrical squaraine dyes based on extended conjugation within the polymethine framework for dye-sensitized solar cells}, journal = {ACS Applied Energy Materials}, volume = {7}, year = {2024}, month = {FEB }, pages = {1461-1475}, type = {Article}, abstract = {

Alkyl group wrapped visible, far-red, and NIR active unsymmetrical squaraine dyes with pi-extension in the polymethine framework-based AM4-AM7 have been designed, synthesized, and utilized as sensitizers for dye-sensitized solar cells. To extend the pi-conjugation within the polymethine framework, thiophene moieties have been incorporated between the donor and acceptor moieties. Absorption spectroscopic studies revealed that pi-extension with each -C \& boxH;C- unit resulted similar to 100 nm of redshift in the charge transfer transition with the lambda(maximum) of 541, 643, 747, and 833 nm for AM4, AM5, AM6, and AM7 dyes, respectively, with the molar extinction coefficient of \>10(5) M(-1)cm(-1). The pi-extended conjugation-based AM6 and AM7 dyes showed improved light-harvesting efficiency (LHE), where the AM7 dye showed an LHE of 386 nm at 60\%. Electrochemical studies of AM dyes revealed that the HOMO energy level of the sensitizers has been modulated systematically. Further, pi-extension within the polymethine framework showed a dramatic effect on V-OC, J(SC), and device efficiency when move from visible active AM4 to far-red active to NIR active AM7 dyes. The DSSC efficiencies of 7.35, 5.18, 0.08, and 0.053\% have been achieved with the I-/I-3(-) electrolyte (Z-50) for the AM4, AM5, AM6, and AM7 dyes, respectively. Further, AM4 dye has been cosensitized with AM5, AM6, and AM7 dyes, where AM4:AM5 (1:1) composition achieved the maximum efficiency of 8.12\% with I-/I-3(-) electrolyte (Z-50) compared to the other cosensitization compositions.

}, keywords = {aggregation of dyes, DSSC device efficiency, light-harvesting efficiency, pi-extension, polymethine framework, squaraine dyes}, issn = {2574-0962}, doi = {10.1021/acsaem.3c02610}, author = {Singh, Amrita and Singh, Ambarish Kumar and Dixit, Ruchi and Vanka, Kumar and Krishnamoorthy, Kothandam and Nithyanandhan, Jayaraj} } @article {49026, title = {Visible light and pH-responsive star copolymer and doxorubicin-polymer conjugate micelles for combination drug delivery and bioimaging}, journal = {Journal of macromolecular science part A- pure and applied chemistry}, volume = {61}, year = {2024}, month = {FEB }, pages = {105-116}, type = {Article}, abstract = {

Amphiphilic 3-arm star copolymer containing visible light-cleavable BODIPY group and pH-responsive imine bonds at the junction of hydrophilic poly(ethylene glycol) (PEG) and two poly(epsilon-caprolactone) (PCL) arms was synthesized by the combination of ring-opening polymerization (ROP) and click chemistry. The formation and stimuli-responsive disruption of micelles were analyzed using dynamic light scattering and transmission electron microscopy. Dual stimuli-responsive release of anticancer drugs Doxorubicin (Dox) and Camptothecin (CPT) from the micelles was studied. Micellar assemblies containing Dox conjugated to PEG-BODIPY through imine bonds were prepared and controlled release of Dox in response to visible light and pH was shown. CPT and Dox-loaded star copolymer micelles as well as CPT loaded Dox-conjugated micelles were used in cellular uptake studies on MDA-MB 231 cells, and the synergistic effect of the two stimuli on the release of the two drugs was demonstrated inside the cells. Micellar assemblies also showed excellent bioimaging properties in the cellular uptake studies. [GRAPHICS]

}, keywords = {BODIPY, drug conjugate, micelles, pH-responsive, visible light-responsive}, issn = {1060-1325}, doi = {10.1080/10601325.2024.2302857}, author = {Basutkar, Nitin B. and Surapaneni, Sai Geetika and Alam, Md. Shafi and Ambade, Ashootosh V.} } @article {49120, title = {Visible light-assisted ferro-photocatalytic application of bismuth ferrite nanoparticles synthesized at low temperature}, journal = {Journal of Materials Science }, volume = {59}, year = {2024}, month = {JAN}, pages = {1513-1525}, type = {Article}, abstract = {

Polycrystalline nano-sized multiferroic bismuth ferrite was prepared by facile sole-gel method using acetic acid as a chelating agent followed by calcination at 450, 500, and 600 degrees C. Transmission electron spectroscopy and X-ray diffraction patterns revealed the crystallinity in the samples, and the crystallite size increased with calcination temperature. The calcination temperature also greatly influenced the grain size of the materials, and high calcination temperature induces a decline in the total surface area per unit mass of material. The ferroelectric polarization measurement showed a decrease in remnant polarization from 0.18 to 0.09 mu C/cm2 with an increase in temperature. The remnant polarization induced delayed recombination of charge carriers upon light illumination, and the high surface area led to the highest photocatalytic activity in 450 degrees C calcined samples. The higher photocurrent density in low-temperature calcined samples supports the visible-light photodegradation studies of Congo Red (CR) dye. A maximum of 76.6\% photocatalytic activity was observed in the 450 celcius calcined bismuth ferrite samples. In summary, the higher photocatalytic efficiency in the low-temperature samples is attributable to the synergistic effect of relatively higher remnant polarization and higher surface area.

}, issn = {0022-2461}, doi = {10.1007/s10853-023-09278-6}, author = {Sarraf, Sonu and Kaushal, Neha and Chugh, Vibhas and Sundar, Adhiraj and Saha, Avishek and Basu, Aviru K.} } @article {49226, title = {Visible-light mediated C-3 amination of quinoxalin-2(1H)-ones via electron donor-acceptor complexation}, journal = {Asian Journal of Organic Chemistry}, volume = {13}, year = {2024}, month = {AUG}, type = {Article}, abstract = {

The formation of carbon-nitrogen bonds holds paramount importance in the realm of synthetic organic chemistry, finding extensive applications in the synthesis of pharmaceuticals, agrochemicals, and organic materials. Herein, we describe a novel EDA complex mediated, metal- and photocatalyst-free, visible-light-initiated direct C-3 amination of biologically important, quinoxalin-2(1H)-one moiety. The key to the success lies in the formation of a photoactivated electron donor-acceptor complex between quinoxalin-2(1H)-one and amine, which undergo subsequent electron transfer reaction to effect the desired transformation. A diverse array of 3-aminoquinoxalin-2(1H)-ones were prepared employing this process and the yields are up to 87\%. This work represents a significant advancement toward a more environmentally friendly and efficient approach, characterized by mild reaction conditions and a high atom economy.

}, keywords = {C-3 amination, Dehydrogenative amination, EDA complex, quinoxalin-2(1H)-ones}, issn = {2193-5807}, doi = {10.1002/ajoc.202400150}, author = {More, Devidas A. and Gayathri, P. R. and Thete, Kishor R. and Muthukrishnan, M.} } @article {49395, title = {Visible-light-induced radical sulfonylative-cyclization cascade of 1,6-Enynol derivatives with sulfinic acids: a sustainable approach for the synthesis of 2,3-disubstituted benzoheteroles}, journal = {CHEMSUSCHEM}, volume = {17}, year = {2024}, month = {OCT }, type = {Journal Article}, keywords = {1, 6-Enynols, Benzofurans, Benzothiophenes, indoles, Sulfones}, issn = {1864-5631}, doi = {10.1002/cssc.202400227}, author = {Haritha Kumari, Arram and Jagadesh Kumar, Jangam and Sharadha, Nunavath and Rama Krishna, Gamidi and Jannapu Reddy, Raju} } @article {49460, title = {Valorization of avocado peel waste: extraction and characterization of cellulose nanofibers for multifunctional applications}, journal = { Biomass Conversion and Biorefinery}, volume = {15}, year = {2025}, month = {APR}, pages = {12789-12800}, type = {Article}, abstract = {

This study explored the utility of underutilized avocado peels for extracting cellulose nanofibers (CNFs). Mild oxalic acid hydrolysis assisted by steam explosion was employed after alkali hydrolysis and chlorine-free bleaching to prepare cellulose nanofibers. The structural, atomic, and elemental features of the extracted fibers were studied using Fourier transform infrared spectroscopy (FTIR),\ 13C solid-state nuclear magnetic resonance (13C NMR) spectroscopy, and energy dispersive X-ray (EDAX) analysis, respectively. The crystallinity index of the nanofibers was 87\%, which was 53\% greater than that of the crude sample. The elution of hemicellulose and lignin was evident from the scanning electron microscopy (SEM) images, and the nanofibers had a fiber diameter of 30{\textendash}82\ nm according to the transmission electron microscopy (TEM) analysis. The applied chemical treatment also elevated the thermal stability of the fibers. The extracted fibers can be applied in numerous fields, including electronics, packaging, automobiles, biomedicine, and cosmetics.

}, doi = {https://doi.org/10.1007/s13399-024-06065-4}, author = {Varsha, P. V. and Neenu, K. V. and Begum, P. M. Sabura and Hounfodji, Jean Wilfried and Sankar, Sameera and Muraleedharan, Sneha and Kamath, Anjali N. and Ajithkumar, T. G. and Parameswaranpillai, Jyotishkumar and Midhun, Dominic C. D.} } @article {49712, title = {Vastly increased mesophase range due to superstructure formation from in situ prepared gold nanoparticles with liquid crystalline ligands: toward enhanced optoelectronic applications}, journal = {ACS Applied Nano Materials}, volume = {8}, year = {2025}, month = {MAY }, pages = {10340-10350}, type = {Article}, abstract = {

Gold nanoparticle (Au NP)-liquid crystal (LC) composites have gained considerable interest in developing cutting-edge electro-optical materials. This study introduces an innovative synthetic approach that significantly augments the capabilities of Au NP-LC composites by utilizing an amine-functionalized LC as both a reducing and capping agent in the refined Brust-Schiffrin method. In its standard form, this method yields Au NP-LC composites with appealing features like improved clearing temperature. However, the optical characteristics do not display any additional features and resemble simple LC-ligand functionalized Au NP, attributed here to the surplus LC employed to obtain the dual capabilities of reduction and capping. Thus, it was gratifying to observe a dramatic enhancement in mesophase stability with the removal of just a few percentages of excess LC, which is attributed to a remarkable and unprecedented one-dimensional superstructure formation. Furthermore, the removal of surplus LC caused the composite to exhibit Fano-like resonance in the UV-vis spectrum, a noteworthy optical feature likely resulting from dynamic plasmonic interactions, including plasmon-polariton interactions and lattice plasmon modes. Thus, the simple yet robust protocol employed yields Au NP-LC composites with an ultrawide thermal range of the mesophase that paves the way for realizing next-generation electro-optic materials featuring enhanced performance and response.

}, keywords = {Fano-resonance, gold nanoparticles, liquid crystals, nanosoftcomposites, superstructure}, doi = {10.1021/acsanm.5c00923}, author = {Duggal, Muskan and Khatavi, Santosh and Yelamaggad, Channabasaveshwar V. and Shankar Rao, Doddamane Sreenivasamurthy and Krishna Prasad, Subbarao and Prasad, Bhagavatula L. V.} } @article {49556, title = {Vat-based 3D-bioprinted scaffolds from photocurable bacterial levan for osteogenesis and immunomodulation}, journal = {Biomacromolecules}, volume = {26}, year = {2025}, month = {JAN}, pages = {954-966}, type = {Article}, abstract = {

Emerging techniques of additive manufacturing, such as vat-based three-dimensional (3D) bioprinting, offer novel routes to prepare personalized scaffolds of complex geometries. However, there is a need to develop bioinks suitable for clinical translation. This study explored the potential of bacterial-sourced methacrylate levan (LeMA) as a bioink for the digital light processing (DLP) 3D bioprinting of bone tissue scaffolds. LeMA was successfully synthesized, characterized, and used to fabricate 3D-bioprinted scaffolds with excellent printability and physicochemical properties. In vitro studies demonstrated superior cytocompatibility of 15\% w/v LeMA gels compared to 20\% gels. 15\% LeMA gels supported osteogenic differentiation , as evidenced by alkaline phosphatase activity and mineral deposition by MC3T3 pre-osteoblasts. Importantly, the LeMA hydrogels positively modulated the macrophage phenotype, promoting the expression of the anti-inflammatory marker CD206. These findings suggest that 3D-printed LeMA scaffolds can create a favorable microenvironment for bone regeneration, highlighting their potential for tissue repair and regeneration applications.

}, issn = {1525-7797}, doi = {10.1021/acs.biomac.4c01264}, author = {Waidi, Yusuf Olatunji and Wagh, Vasudev S. and Mishra, Shivangi and Jhunjhunwala, Siddharth and Dastager, Syed G. and Chatterjee, Kaushik} } @article {49543, title = {Visible light-responsive composition-dependent morphology and cargo release in mixed micelles of dendron amphiphiles}, journal = {Langmuir}, volume = {41}, year = {2025}, month = {JAN}, pages = {1957-1967}, type = {Article}, abstract = {

2,2-Bis-(methylol)propionic acid-based second-generation polyester dendron amphiphile (T-D) containing visible light-responsive donor-acceptor Stenhouse adduct (DASA) as hydrophobic tails is synthesized. Micelles of T-D amphiphile and its mixed micelles of varying compositions with nonresponsive dendron amphiphile containing lauryl groups are prepared in aqueous solution. In transmission electron microscopy and atomic force microscopy analyses, T-D amphiphiles show rice grain-like ellipsoidal micelles as the predominant morphology. Mixed micelles display a composition-dependent morphology gradient such that the morphology changes from rice grain like to mixed to completely spherical with decreasing content of the T-D amphiphile. Complete morphology change to spherical micelles and partial reversal to ellipsoidal micelles, finally leading to ill-defined aggregates, are observed when the T-D amphiphile micelles are subjected to visible light-dark storage photoswitching cycles. Small-angle neutron scattering (SANS) analysis of 1 wt.\% micellar solution in THF:water (10:90) reveals only a minor change in shape and size upon photoirradiation, and the data could be fitted to spherical or ellipsoidal model. Release of hydrophobic dye from mixed micelles is tuned by the content of the photoresponsive amphiphile. Cellular uptake and visible light-triggered release of hydrophobic drug from mixed micelles are demonstrated using MDA-MB-231 cells, suggesting their applicability for photoresponsive drug delivery.

}, issn = {0743-7463}, doi = {10.1021/acs.langmuir.4c04509}, author = {Avhad, Shankarrao V. and Kumar, Sugam and Ambade, Ashootosh V.} } @article {49824, title = {Visible-light active π-extended unsymmetrical squaraine dyes for dye-sensitized solar cells: steric effects for controlling the aggregation of dyes}, journal = {ACS Applied Energy Materials}, volume = {8}, year = {2025}, month = {OCT}, pages = {15459-15470}, type = {Article}, abstract = {

The dye-anchored TiO2 photoanode plays a vital role in the light harvesting and charge separation processes in dye-sensitized solar cells. Aggregation of dyes (H- and J-type) on the TiO2 surface is a facile process due to the presence of a periodical dye anchoring sites on the exposed facet of titania, and such self-assembled dye structures help broadening the absorption profile. However, photocurrent generation from such aggregated structure is a challenging task in dye-sensitized solar cell devices. Hence, controlling the dye aggregation on the TiO2 surface is an important aspect. Controlling the aggregation of dyes by which (i) an enhanced photocurrent generation (J SC) and (ii) enhanced V OC can be achieved by including the steric factors to the dye design principles, the steric factor in the sensitizer may help passivate the TiO2 surface to avoid the charge recombination process between electrons present in TiO2 and the oxidized electrolyte. On the other hand, extension of pi-conjugation in a sensitizer helps enhance the light absorption in the visible region besides modulating the HOMO and LUMO energy levels. Hence, synergizing both pi-extensions along with features that control the dye aggregation has been considered in designing visible active squaraine dyes. A thiophene pi-spacer was inserted in between a visible-light active unsymmetrical squaraine unit and a cyanoacetic acid acceptor unit to provide the AJ1 and AJ2 dyes. Though both the dye molecules possess a similar pi-framework, the AJ2 dye was functionalized with both in-plane and out-of-plane alkyl groups to decrease the aggregation of dyes on the TiO2 surface compared to AJ1. The AJ1 and AJ2 dyes absorbed at 560 nm with shoulder peaks appeared at 528 nm, which can be assigned to vibronic progression (1082 cm-1), and additional characteristic peaks of thiophene appeared at 392 nm with the molar extinction coefficient of 1.16-1.19 x 105 M-1 cm-1 in CH3CN. The LUMO and HOMO energy levels are well aligned with the conduction band of TiO2 and the redox potential of iodolyte (I-/I3 -) electrolyte with sufficient overpotentials for charge injection and dye regeneration processes, respectively. The highest DSSC device efficiency of 7.37\% (J SC 14.44 mA/cm2, V OC 0.771 V, ff 67.1\%) was achieved for the AJ2 dye with iodolyte (I-/I3 -) electrolyte in the presence of 2 equiv of optically transparent coadsorbent chenodeoxycholic acid (CDCA), which showed a good IPCE response in between 400 and 700 nm. Further, cosensitization of visible-light active AJ1, AJ2, and SQA10 dyes with a complementary far-red active SQS4 dyes showed the device efficiencies of 5.53\% (AJ1:SQS4:CDCA), 7.14\% (AJ2:SQS4:CDCA), and 7.18\% (SQA10:SQS4:CDCA) with a good IPCE response in the 400-720 nm region.

}, keywords = {cosensitization, Dye aggregation, Dye-sensitized solar cells, pi-extended squaraine dye, visible-lightactivedyes}, issn = {2574-0962}, doi = {10.1021/acsaem.5c02553}, author = {Jadhav, Avinash P. and Siby, Jesna and Pandya, Rinu and Vanka, Kumar and Krishnamoorthy, Kothandam and Nithyanandhan, Jayaraj} } @article {49792, title = {Visible-light-driven photocatalytic glycerol oxidation to value-added and highly selective glyceric/lactic acid}, journal = {ChemiCatChem}, volume = {17}, year = {2025}, month = {SEP}, type = {Article}, abstract = {

Achieving economical and sustainable artificial photosynthesis (APS) in direct sunlight for liquid fuel production with high efficiency remains an important challenge. A major obstacle in the photoelectrochemical (PEC) oxidation of organic compounds is attaining high selectivity with the desired product(s). This study introduces a novel strategy by integrating BiVO4 quantum dots (BVQDs), structurally and electronically, into the nanopores of commercial TiO2 (BVT for BVQDs integrated in pores of TiO2) to improve solar-driven photocatalysis. The band gap of the BVT photoanode decreases to 2.53 eV as compared to pure TiO2 (3.2 eV), which enhances visible light absorption and charge separation. BVT with Pt as a co-catalyst acts as an APS system, which selectively oxidizes glycerol into lactic acid (100\% selectivity at 1 mM glycerol) and glyceric acid (98\% selectivity at 100 mM), while simultaneously generating green hydrogen. Selectivity of the product can be further controlled by anaerobic or aerobic conditions as well as the length of the reaction time. Direct integration of BVQDs into TiO2 mesopores significantly enhances charge separation as well as utilization at redox sites. Current work provides key insights into optimizing photocatalytic conditions for highly selective value-added chemical production, which highlights the sustainability and efficacy of TiO2-based semiconductors with quantum dot integration.

}, keywords = {energy conversion, Energy storage, Photocatalysis, Quantum material, solar energy}, issn = {1867-3880}, doi = {10.1002/cctc.202500641}, author = {Kulkarni-Sambhare, Mukta and Salgaonkar, Kranti N. and Saha, Avishek and Gopinath, Chinnakonda S.} } @article {49795, title = {Vanillin-based recyclable thermosets and their glass fiber reinforced composites}, journal = {Macromolecular Chemistry and Physics}, volume = {227}, year = {2026}, month = {JAN}, type = {Article}, abstract = {

The accumulation of end-of-life plastic materials and composite reinforcement waste materials has brought much attention to developing sustainable alternatives and their re-processability. Incorporating covalent adaptable networks (CANs) into the crosslinked network bridges the concept of reversibility into the otherwise conventional non-reversible networks. This study investigates the structure-property relation in two reversible hardener systems derived from vanillin using Schiff base chemistry. The {\textquoteleft}{\textquoteleft}CAN{\textquoteright}{\textquoteright} systems were synthesized by condensation of vanillin with two amines, 4,4{\textquoteright}-oxydianiline and tris(2-aminoethyl)amine, respectively, to form Va_ODA and Va_TAEA. The epoxy thermosets exhibited glass transition temperatures (T-g) of 125 degrees C and 115 degrees C, respectively, for Va_ODA and Va_TAEA, which is superior to most reversible vanillin-based systems reported. The vitrimer-thermosets exhibited promising mechanical and thermal properties, and reshaping abilities as a function of applied temperatures, indicating the dynamic nature of linkages. Chemical degradability was demonstrated by heating to 80 degrees C for 12 h in aqueous acidic medium or excess amine. The fabricated glass fiber composites exhibited good mechanical properties with tensile strength of 361 MPa and degradability in acetic acid/water mixture with a fiber recovery of \>98 \%. The recovered glass fiber exhibited almost similar tensile strength as the virgin glass fiber, demonstrating its potential reusability. The epoxy vitrimers underwent mechanical reprocessing through hot-pressing, as well as chemical reprocessing via 3D printing and by regeneration of imine bonds to form an epoxy resin.

}, keywords = {3D printing, covalent adaptable network, re-processability, Schiff base, Vanillin}, issn = {1022-1352}, doi = {10.1002/macp.202500420}, author = {Veetil, Ashwani Puthiya and Ravikumar, Aniruddha and Rajput, Tejas and Singh, Aman Kumar and Thakur, Tamanna and Krishna, Abhijith and Pol, Harshawardhan and Shanmuganathan, Kadhiravan and Asha, S. K.} }