02718nas a2200229 4500008004100000022001400041245012700055210006900182260007100251300001600322490000700338520184800345100002002193700001902213700002202232700001502254700002002269700002502289700003002314700001502344856012902359 2005 eng d a0743-746300aCobalt and magnesium ferrite nanoparticles: preparation using liquid foams as templates and their magnetic characteristics0 aCobalt and magnesium ferrite nanoparticles preparation using liq a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcNOV a10638-106430 v213 a

An easy and convenient method for the synthesis of cobalt and magnesium ferrite nanoparticles is demonstrated using liquid foams as templates. The foam is formed from an aqueous mixture of an anionic surfactant and the desired metal ions, where the metal ions are electrostatically entrapped by the surfactant at the thin borders between the foam bubbles and their junctions. The hydrolysis is carried out using alkali resulting in the formation of desired nanoparticles, with the foam playing the role of a template. However, in the formation of ferrites with the formula MFe2O4, where the metal ion and iron possess oxidation states of +2 and +3, respectively, forming a foam from a 1:2 mixture of the desired ionic solutions would lead to a foam composition at variance with the original solution mixture because of greater electrostatic binding of ions possessing a greater charge with the surfactant. In our procedure, we circumvent this problem by preparing the foam from a 1:2 mixture of M2+ and Fe2+ ions and then utilizing the in situ conversion of Fe2+ to Fe3+ under basic conditions inside the foam matrix to get the desired composition of the metal ions with the required oxidation states. The fact that we could prepare both CoFe2O4 and MgFe2O4 particles shows the vast scope of this method for making even multicomponent oxides. The magnetic nanoparticles thus obtained exhibit a good crystalline nature and are characterized by superparamagnetic properties. The magnetic features observed for CoFe2O4 and MgFe2O4 nanoparticles are well in accordance with the expected behaviors, with CoFe2O4 particles showing higher blocking temperatures and larger coercivities. These features can easily be explained by the contribution of Co2+ sites to the magnetocrystalline anisotropy and the absence of the same from the Mg2+ ions.

1 aBala, Tanushree1 aSankar, C., R.1 aBaidakova, Marina1 aOsipov, V.1 aEnoki, Toshiaki1 aJoy, Pattayil, Alias1 aPrasad, Bhagavatula L. V.1 aSastry, M. uhttps://library.ncl.res.in/content/cobalt-and-magnesium-ferrite-nanoparticles-preparation-using-liquid-foams-templates-and-002946nas a2200241 4500008004100000022001400041245013500055210006900190260009500259300001200354490000800366520202500374653001302399653000902412653001902421653004502440653001102485100002002496700001402516700003002530700001502560856012902575 2005 eng d a0021-979700aPhase transfer of oleic acid capped NicoreAgshell nanoparticles assisted by the flexibility of oleic acid on the surface of silver0 aPhase transfer of oleic acid capped NicoreAgshell nanoparticles  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcMAR a422-4310 v2833 a

The phase transfer protocols in vogue for the oleic acid capped silver nanoparticles, viz., salt-induced precipitation and redispersion or phosphoric acid-induced method, are examined and compared thoroughly. A comprehensive evaluation with respect to the mechanistic aspects involved is made and the merits and demerits of the different procedures are delineated. It is found that the salt-induced precipitation and redispersion is more versatile in that the precipitate can actually be redispersed in both aqueous and organic media. However, in terms of mechanism both the routes seem to be very similar wherein the orientational change of oleic acid on the silver surface in the two different environments-organic and aqueous-plays a crucial role in the adaptability of the system to the different environments. Subsequently, this change of orientation of oleic acid on silver surface in aqueous and organic media has been utilized to phase transfer Ni-based nanoparticulate systems. The nascent oleic acid-capped Ni nanoparticles, which were synthesized by a foam-based protocol, were dispersible in water but not in nonpolar organic media such as cyclohexane or toluene. Then, just by coating a thin shell of silver on them we could achieve complete phase transfer of the NicoreAgshell from aqueous to organic media following similar procedures used for oleic acid-capped silver nanoparticles. Here, the phase transfer seems to be facilitated by the orientational flexibility of oleic acid on the silver surface as opposed to other metal surfaces as evidenced from the infrared and thermogravimetric analyses of oleic acid-capped Ni and NicoreAgshell nanoparticles. This orientation-assisted phase transfer method could be generalized and can be adapted to other systems where, if the nascent nanoparticles cannot be phase transferred as is, they can be coated by a silver shell and oleic acid making them suitable for dispersion in both aqueous and organic media. (C) 2004 Elsevier Inc. All rights reserved.

10a(1) HNMR10aFTIR10aPhase transfer10atransmetalation core-shell nanoparticles10aUV-Vis1 aBala, Tanushree1 aSwami, A.1 aPrasad, Bhagavatula L. V.1 aSastry, M. uhttps://library.ncl.res.in/content/phase-transfer-oleic-acid-capped-nicoreagshell-nanoparticles-assisted-flexibility-oleic-001556nas a2200181 4500008004100000022001400041245004300055210004200098260007100140300001200211490000700223520097800230100003001208700002101238700002001259700001501279856008001294 2005 eng d a0743-746300aSolvent-adaptable silver nanoparticles0 aSolventadaptable silver nanoparticles a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcFEB a822-8260 v213 a

A simple and efficient way of obtaining silver nanoparticles that are dispersible both in organic and in aqueous solvents using a single capping agent is described. The silver nanoparticles are initially prepared in water in the presence of aerosol OT [sodium bis(2-ethylhexyl)-sulfosuccinate, AOT]. Thereafter, transfer of the AOT-capped silver nanoparticles to an organic phase is induced by the addition of a small amount of orthophosphoric acid during shaking of the biphasic mixture. The AOT-stabilized silver nanoparticles could be separated out from the organic phase in the form of a powder. The hydrophobic nanoparticles thus prepared are stable and are readily resuspended in a variety of other polar (including water) and nonpolar solvents without further surface treatment. The amphiphatic nature of the silver surface is brought about by a small orientational change in the AOT monolayer on the silver surface in response to the polarity of the solvent.

1 aPrasad, Bhagavatula L. V.1 aArumugam, S., K.1 aBala, Tanushree1 aSastry, M. uhttps://library.ncl.res.in/content/solvent-adaptable-silver-nanoparticles-101952nas a2200241 4500008004100000022001400041245011200055210006900167260009500236300001400331490000600345520104000351653001301391653003201404653002101436653001901457100002001476700002301496700001801519700001901537700003001556856012401586 2006 eng d a1533-488000aAssembly of phase transferred nickel nanoparticles at air-water interface using Langmuir-Blodgett technique0 aAssembly of phase transferred nickel nanoparticles at airwater i a25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USAbAMER SCIENTIFIC PUBLISHERScDEC a3736-37450 v63 a

Development of simple and efficient protocol for the synthesis of Ni nanoparticles in aqueous media and their subsequent phase transfer to organic media is reported. The synthesis of nickel nanoparticles in aqueous medium is accomplished by reducing the nickel nitrate with sodium borohydricle in presence of oleic acid. It results in the formation of nickel nanoparticles capped with oleic acid. The pristine oleic acid capped nickel nanoparticles were then phase transferred to nonpolar solvents such as toluene using stearic acid. The phase transfer was effective probably due to the space exchange between the oleic acid moiety and stearic acid molecules. The hydrophobized Ni thus obtained was organized at the air-water interface and it was observed that by controlling the pressure and concentration of hydrophobized Ni nanoparticles at air-water interface, linear ribbon like assemblies could be obtained. The organization process was followed by surface pressure-area isotherm measurement and Brewster Angle Microscopy.

10aassembly10aLangmuir-Blodgett technique10aNi nanoparticles10aPhase transfer1 aBala, Tanushree1 aJoshi, Bhagyashree1 aIyer, Neelima1 aSastry, Murali1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/assembly-phase-transferred-nickel-nanoparticles-air-water-interface-using-langmuir-001537nas a2200253 4500008004100000022001400041245005700055210005500112260012500167300002300292490000700315520067000322100002500992700001301017700002301030700002001053700001801073700001501091700001501106700003001121700002701151700001801178856008701196 2006 eng d a0003-695100aLa0.7Sr0.3MnO3 nanoparticles coated with fatty amine0 aLa07Sr03MnO3 nanoparticles coated with fatty amine aCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScJUL aArticle No. 0231070 v893 a

We report on the synthesis of La0.7Sr0.3MnO3 (LSMO) nanoparticles having perovskite structure and particle size of the order of 30 rim. The process involves citrate-gel synthesis, size filtering, and; surface coating with a shell of octadecyl amine (ODA) using electrostatic interaction-assisted novel chemical route. Magnetic measurements show the Curie temperature of similar to 360 K establishing the desired stoichiometry and phase. Fourier transform infrared-studies bring out. that the amine group of ODA interacts with the LSMO surface. Refluidization yields uniform redispersion of the coated and dried powder. (c) 2006 American Institute of Physics.

1 aRajagopal, Rajashree1 aMona, J.1 aKale, Sangeeta, N.1 aBala, Tanushree1 aPasricha, Rem1 aPoddar, P.1 aSastry, M.1 aPrasad, Bhagavatula L. V.1 aKundaliya, Darshan, C.1 aOgale, S., B. uhttps://library.ncl.res.in/content/la07sr03mno3-nanoparticles-coated-fatty-amine-101499nas a2200169 4500008004100000245008500041210006900126260000800195300001400203490000600217520083500223653008401058100002001142700002001162700003001182856011701212 2007 eng d00aFerromagnetic resonance in nanomagnetic metal core and noble metal shell systems0 aFerromagnetic resonance in nanomagnetic metal core and noble met cSEP a3134-31390 v93 a

The change in the line widths in the ferromagnetic resonance (FMR) spectra of Co and Ni nanoparticles upon shell formation with noble metals like gold or silver are described. The NicoreAgshell, CocoreAgshell, and CocoreAushell nanoparticles were prepared by a simple transmetallation reaction between the Co and Ni nanoparticles and the Ag+ or AuCl−4 ions. It is revealed that the FMR line width decreases upon Ag shell formation whereas it increases upon core–shell composite formation with Au. Several probable explanations such as the differences in size distributions before and after the reaction or the changes occurring in shape anisotropy of the particles due to the shell formation or the different extents of electronic interaction between the core and shell materials have been offered for this observation.

10aFmr Study; Line Width Comparison; Magnetic Core-Noble Metal Shell Nanoparticles1 aBala, Tanushree1 aEnoki, Toshiaki1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/ferromagnetic-resonance-nanomagnetic-metal-core-and-noble-metal-shell-systems03077nas a2200181 4500008004100000245008900041210006900130260000800199300001600207490000800223520242800231100002002659700003002679700001902709700003002728700002402758856011302782 2007 eng d00aInteraction of different metal ions with carboxylic acid group: a quantitative study0 aInteraction of different metal ions with carboxylic acid group a cJUN a6183–61900 v1113 a

The binding strength of the carboxylic acid group (-COOH) with different divalent metal ions displays considerable variation in arachidic acid (AA) thin films. It is considered that in AA thin films the metal ions straddle the hydrophilic regions of the stacked bilayers of AA molecules via formation of carboxylates. In this study first the uptake of different divalent cations in films of AA is estimated by atomic absorption spectroscopy (AAS). Through the amount of cation uptake, it is found that the strength of binding of different cations varies as Ca2+ > Co2+ > Pb2+ > Cd2+. Variation in the binding strength of different ions is also manifested in experiments where AA thin films are exposed to metal ion mixtures. The higher binding strength of AA with certain metal ions when exposed individually, as well as the preference over the other metal ions when exposed to mixtures, reveal some interesting deviation from the expected behavior based on considerations of ionic radii. For example, Pb2+ is always found to bind to AA much more strongly than Cd2+ even though the latter has smaller ionic radius, indicating that other factors also play an important role in governing the binding strength trends apart from the effects of ionic radii. Then, to get a more meaningful knowledge regarding the binding capability, first-principles calculations based on density functional theory have been applied to study the interaction of different cations with the simplest carboxylic acid, acetic acid, that can result in formation of metal diacetates. Their electronic and molecular structures, cohesive energies, and stiffness of the local potential energy well at the cation (M) site are determined and attempts are made to understand the diversity in geometry and the properties of binding of different metal ions with -COOH group. We find that the calculated M−O bond energies depend sensitively on the chemistry of M atom and follow the experimentally observed trends quite accurately. The trends in M−O bond energies and hence the total M−acetate binding energy trends can actually be related to their molecular structures that fall into different categories:  Ca and Cd have tetrahedral coordination; Fe, Ni, and Co exhibit planar 4-fold coordination; and Pb is off-centered from the planar structure (forming pyramidal structure) due to its stereochemically active lone pair of electrons.

1 aBala, Tanushree1 aPrasad, Bhagavatula L. V.1 aSastry, Murali1 aKahaly, Mousumi, Upadhyay1 aWaghmare, Umesh, V. uhttps://library.ncl.res.in/content/interaction-different-metal-ions-carboxylic-acid-group-quantitative-study01623nas a2200217 4500008004100000022001400041245012800055210006900183260007100252300001400323490000800337520078300345100002401128700002001152700001601172700001701188700001901205700001901224700003001243856013201273 2009 eng d a1932-744700aPreparation of nearly monodisperse nickel nanoparticles by a facile solution based methodology and their ordered assemblies0 aPreparation of nearly monodisperse nickel nanoparticles by a fac a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR a3426-34290 v1133 a

Nickel nanoparticles have been synthesized by a simple wet chemical reduction technique in the presence of a surfactant sodium dodecyl sulfate (SDS) and a capping agent oleic acid. Varying the concentration of the surfactant and the capping agent has been found to critically govern the nature of the nanoparticles prepared. It is observed that at an optimum concentration of SDS and oleic acid, nearly monodisperse Ni nanoparticles are obtained that form highly ordered hexagonally close-packed structures on electron microscopy grids by a simple drop coating procedure. It is also shown that the presence of oleic acid is necessary for the stability of the Ni nanoparticles synthesized. Structural and magnetic characterizations of the nanoparticles are also presented.

1 aSidhaye, Deepti, S.1 aBala, Tanushree1 aSrinath, S.1 aSrikanth, H.1 aPoddar, Pankaj1 aSastry, Murali1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/preparation-nearly-monodisperse-nickel-nanoparticles-facile-solution-based-methodology-and-001893nas a2200253 4500008004100000022001400041245013000055210006900185260007700254300001400331490000600345520095100351653001401302653001501316653002501331653002001356653002101376100001901397700002001416700002401436700002801460700001901488856013201507 2009 eng d a1613-681000aSynthesis of catalytically active porous platinum nanoparticles by transmetallation reaction and proposition of the mechanism0 aSynthesis of catalytically active porous platinum nanoparticles  aPO BOX 10 11 61, D-69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJUN a1467-14730 v53 a

A facile method for the synthesis of porous platinum nanoparticles by transmetallation reactions between sacrificial nickel nanoparticles and chloroplatinic acid (H(2)PtCl(6)) in solution, as well as at the constrained environment of the air water interface, using a Langmuir-Blodgett instrumental setup is presented. To carry out the transmetallation at the air-water interface hydrophobized nickel nanoparticles are assembled as a monolayer on the sub phase containing platinum ions. The porous Pt nanoparticles obtained as a result of the reaction are found to act as extremely good catalysts for hydrogenation reaction. The products are well characterized by TEM, HRTEM, EDAX, and STEM. Attempts are made to postulate the plausible mechanism of this reaction to generate this kind of nanoparticle with controllable geometric shape and structure. This simple strategy has the potential to synthesize other nanomaterials of interest too.

10aCatalysts10aInterfaces10aNickel nanoparticles10aporous platinum10aTransmetallation1 aPasricha, Renu1 aBala, Tanushree1 aBiradar, Ankush, V.1 aUmbarkar, Shubhangi, B.1 aSastry, Murali uhttps://library.ncl.res.in/content/synthesis-catalytically-active-porous-platinum-nanoparticles-transmetallation-reaction-and-001622nas a2200169 4500008004100000245013000041210006900171260000800240300001000248490000700258520097100265100002001236700002101256700002001277700003001297856012501327 2012 eng d00aFoam based synthesis of metal carbonates: establishing the role of spatial confinement for obtaining interesting morphologies0 aFoam based synthesis of metal carbonates establishing the role o cMAY a91-970 v113 a

The crystallization of different carbonates namely lead carbonate, cadmium carbonate and strontium carbonate in aqueous foam stabilized by the surfactant sodium dodecyl sulphate (SDS) by a method of cation entrapment is described. Reaction of ammonium carbonate with the respective cations electrostatically entrapped in the foam results in the formation of minerals, possibly in the Plateau border and Plateau junction regions of the foam. The unusual morphology of the crystals obtained from foam based synthetic method as compared to the crystals prepared in aqueous solution shows the utility of the template for the growth of crystals with an unusual morphology due to constrained environment. The materials are well characterized using TEM, SEM, EDAX and FTIR techniques. The large interfacial area of the liquid lamellae in the foam provides a striking possibility for the large-scale synthesis for not only minerals but also other nanoscale materials.

1 aBala, Tanushree1 aSanyal, Ambarish1 aPant, Jayashree1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/foam-based-synthesis-metal-carbonates-establishing-role-spatial-confinement-obtaining01590nas a2200217 4500008004100000022001400041245006700055210006500122260011000187300001400297490000700311520080700318100002201125700001801147700002601165700002201191700001601213700003001229700002001259856009301279 2014 eng d a1144-054600aFacile method for the synthesis of Co-core Au-shell nanohybrid0 aFacile method for the synthesis of Cocore Aushell nanohybrid aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcSEP a4107-41140 v383 a

Heterostructured Co-Au core-shell nanoparticles have been synthesized by reducing AuCl4- ions on cobalt nanoparticles after a minor but effective modification of cobalt surface by an amine. The core shell morphology is emphatically confirmed by thorough investigation through UV-Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopic analysis (TEM). The chemical composition and topography were determined using STEM-HAADF analysis and EFTEM imaging. Fourier transform infrared (FTIR) spectroscopy confirms the surface modification of Co nanoparticles and the interactions involved between the ligands and the core and shell metals at various steps of the synthetic process. The magnetic properties confirm the material to be superparamagnetic in nature.

1 aSardar, Debasmita1 aNeogi, S., K.1 aBandyopadhyay, Sanjoy1 aSatpati, Biswarup1 aJain, Ruchi1 aGopinath, Chinnakonda, S.1 aBala, Tanushree uhttps://library.ncl.res.in/content/facile-method-synthesis-co-core-au-shell-nanohybrid-001679nas a2200205 4500008004100000022001400041245008500055210006900140260011000209300001600319490000600335520088800341100001801229700002201247700002001269700001801289700003001307700002001337856011601357 2014 eng d a2046-206900aPreferential growth of Au on CdSe quantum dots using langmuir-blodgett technique0 aPreferential growth of Au on CdSe quantum dots using langmuirblo aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV a64535-645410 v43 a

Oleyl amine capped CdSe quantum dots (QD) were synthesised by hot injection technique. These QDs formed a self-assembled monolayer on an aqueous subphase of a Langmuir-Blodgett (LB) trough. Here, in this report we introduced a simple but very efficient route to form a metal (Au)-QD hybrid nanostructure via the LB technique. In this method, the metal counterpart of the hybrid nanostructure could be deposited exclusively on one side of the QDs. The formation of stable monolayer of QDs was evidenced from a surface pressure-area (P-A) isotherm. The development of gold tip was confirmed and monitored by detailed TEM study on the monolayer deposited on TEM grids from the LB trough. Other characterizations like UV-Vis spectroscopy, FTIR, XPS and EDX also suggested the same. Oleyl amine was shown to act both as a reducing agent as well as a capping agent in this strategy.

1 aDas, Subhasis1 aSatpati, Biswarup1 aChauhan, Himani1 aDeka, Sasanka1 aGopinath, Chinnakonda, S.1 aBala, Tanushree uhttps://library.ncl.res.in/content/preferential-growth-au-cdse-quantum-dots-using-langmuir-blodgett-technique-002032nas a2200241 4500008004100000022001400041245008300055210006900138260011000207300001400317490000700331520114000338100002201478700001801500700002601518700002201544700001801566700002101584700001601605700003001621700002001651856011901671 2015 eng d a1144-054600aMultifaceted core-shell nanoparticles: superparamagnetism and biocompatibility0 aMultifaceted coreshell nanoparticles superparamagnetism and bioc aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAUG a8513-85210 v393 a

NicoreAgshell nanoparticles were synthesized by redox transmetallation reaction. Reduction potential match was encouraging to attempt the synthesis of the NicoreAushell system too. However, it could be achieved only after an effective surface modification on the Ni-core. Thorough characterization (UV-Vis spectroscopy, fluorescence spectroscopy, XRD, XPS, FTIR, TEM, and EDX) proved the necessity of surface modification and the success of synthesis of both types of core-shell structures. The chemical composition and topography were determined using STEM-HAADF analysis and EFTEM imaging. Fourier transform infrared (FTIR) spectroscopy confirmed the surface modification of Ni nanoparticles and the interactions involved between the ligands and metals (in the core and/or the shell) at various steps of the synthetic process. Even after the formation of the noble metal shell, the magnetic core was found to retain its superparamagnetic nature. In addition, the Au-shell protected the core from aerial oxidation and decreased toxicity as compared to pristine Ni nanoparticles as observed by MTT assay on normal cells (PBMCs).

1 aSardar, Debasmita1 aNeogi, S., K.1 aBandyopadhyay, Sanjoy1 aSatpati, Biswarup1 aAhir, Manisha1 aAdhikary, Arghya1 aJain, Ruchi1 aGopinath, Chinnakonda, S.1 aBala, Tanushree uhttps://library.ncl.res.in/content/multifaceted-core-shell-nanoparticles-superparamagnetism-and-biocompatibility-001619nas a2200217 4500008004100000022001400041245007500055210006900130260011000199300001600309490000600325520081000331100001801141700002201159700002001181700001801201700002701219700003001246700002001276856010501296 2016 eng d a2046-206900aSeeding of Au on CdSe/CdS nanoplates using Langmuir-Blodgett technique0 aSeeding of Au on CdSeCdS nanoplates using LangmuirBlodgett techn aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJAN a14658-146650 v63 a

Oleyl amine capped CdSe/CdS nanoplates were synthesized by hot injection technique which formed a stable monolayer over both a water subphase and an aqueous HAuCl4 subphase using a Langmuir-Blodgett trough. Au islands were generated at the edge as well as on one specific surface of the flat nanoplates by exploiting the reducing capacity of oleyl amine to form Au nanoseeds from AuCl4- ions. The initial Au nanoseeds changed to a shell surrounding these nanoplates on prolonged exposure to the subphase containing the Au precursor. Monolayer of the hybrid structures was deposited onto suitable substrates for characterization by a number of different techniques and to study the photocatalytic activity. The same substrate with the monolayers could be re-used in several cycles of photocatalysis.

1 aDas, Subhasis1 aSatpati, Biswarup1 aChauhan, Himani1 aDeka, Sasanka1 aGhosalya, Manoj, Kumar1 aGopinath, Chinnakonda, S.1 aBala, Tanushree uhttps://library.ncl.res.in/content/seeding-au-cdsecds-nanoplates-using-langmuir-blodgett-technique-001274nas a2200181 4500008004100000245007400041210006900115260000800184300002700192490000600219520064600225100001800871700002000889700002700909700003000936700002000966856010600986 2017 eng d00aFacile synthesis of Al2O3-Pt nanocomposite and its catalytic activity0 aFacile synthesis of Al2O3Pt nanocomposite and its catalytic acti cNOV aArticle Number: 1150020 v43 aPt nanoparticles were synthesized on gamma-alumina support in presence of oleic acid which was found to prevent clustering of Pt nanoparticles on the support. Various percentage of Pt loading on the alumina changed the catalytic activity for preferential oxidation of CO at relatively low temperature in H-2 rich stream. Pt nanoparticles when synthesized in absence of oleic acid, were all clustered and did not have any catalytic activity. The presence of oleic acid promoted stability preventing agglomeration of Pt nanoparticles. The catalyst thus prepared was characterized thoroughly and their catalytic activity was studied in details.1 aDas, Subhasis1 aBordoloi, Ankur1 aGhosalya, Manoj, Kumar1 aGopinath, Chinnakonda, S.1 aBala, Tanushree uhttps://library.ncl.res.in/content/facile-synthesis-al2o3-pt-nanocomposite-and-its-catalytic-activity01448nas a2200181 4500008004100000245007700041210006900118260000800187300002700195490000600222520081200228100002201040700001801062700002701080700003001107700002001137856010901157 2017 eng d00aFacile synthesis of ZnO-Ag nanocomposite and its photocatalytic activity0 aFacile synthesis of ZnOAg nanocomposite and its photocatalytic a cMAY aArticle Number: 0550110 v43 a

The evolution of photoactive hybrid materials (e.g. noble metal-semiconductor) has resulted in heterogeneous photocatalysis. We report a facile route for the synthesis of ZnO-Ag nanocomposites with varying percentage of loading of the noble metal, expecting a great boost in the photocatalytic behavior of ZnO. The as prepared material was thoroughly characterized by UV-Vis, FTIR, TEM, FESEM, XRD, XPS analyses. The photocatalytic activities of the nanocomposites have been assessed from the ability to degrade methylene blue dye in aqueous solution. The results suggest that incorporation of Ag nanoparticles on the surface of ZnO particles can enhance catalytic activity in comparison to pure ZnO particles under visible light by minimizing the recombination of photogenerated electron-hole pairs.

1 aSardar, Debasmita1 aMaity, Jayeta1 aGhosalya, Manoj, Kumar1 aGopinath, Chinnakonda, S.1 aBala, Tanushree uhttps://library.ncl.res.in/content/facile-synthesis-zno-ag-nanocomposite-and-its-photocatalytic-activity01720nas a2200205 4500008004100000245013500041210006900176260000800245520093500253100002201188700002401210700002001234700001901254700001801273700002601291700001601317700003001333700002001363856013101383 2017 eng d00aMultiple functionalities of Ni nanoparticles embedded in carboxymethyl guar gum polymer: catalytic activity and superparamagnetism0 aMultiple functionalities of Ni nanoparticles embedded in carboxy cJAN3 aComposites comprising of metallic nanoparticles in polymer matrices have allured significant importance due to multifunctionalities. Here a simple protocol has been described to embed Ni nanoparticles in carboxymethyl guar gum (CMGG) polymer. The composite formation helps in the stabilization of Ni nanoparticles which are otherwise prone towards aerial oxidation. Further the nanoparticles retain their superparamagnetic nature and catalytic capacity. Ni-Polymer composite catalyses the reduction of 4-Nitrophenol to 4-Aminophenol very efficiently in presence of NaBH4, attaining a complete conversion under some experimental conditions. Ni-Polymer composite is well characterized using UV–vis spectroscopy, FTIR, XPS, powder XRD, TGA, SEM and TEM. A detailed magnetic measurement using superconducting quantum interference device-vibrating sample magnetometer (SQUID-VSM) reveals superparamagnetic behaviour of the composite.1 aSardar, Debasmita1 aSengupta, Manideepa1 aBordoloi, Ankur1 aAhmed, Md., A.1 aNeogi, S., K.1 aBandyopadhyay, Sanjoy1 aJain, Ruchi1 aGopinath, Chinnakonda, S.1 aBala, Tanushree uhttps://library.ncl.res.in/content/multiple-functionalities-ni-nanoparticles-embedded-carboxymethyl-guar-gum-polymer-catalytic01646nas a2200229 4500008004100000022001400041245009800055210006900153260000900222300001400231490000700245520085500252100001801107700002601125700002201151700001801173700001801191700002701209700003001236700002001266856013001286 2018 eng d a1144-054600aDeposition of Au nanoparticles inside porous CeO2 nanocubes using Langmuir-Blodgett technique0 aDeposition of Au nanoparticles inside porous CeO2 nanocubes usin cJAN  a1379-13860 v423 a

Porous 3D CeO2 nanocubes were synthesized using hot injection technique. These nanocubes were able to form a stable monolayer over water and HAuCl4 subphase in Langmuir-Blodgett (LB) trough due to the presence of surface capped oleic acid and oleylamine. CeO2-Au nanocomposites were synthesized exploiting the ability of oleylamine to reduce AuCl4 ions to Au-0, via LB method. CeO2 nanocubes gave rise to excellent long-range assembly at air/water interface and gold nanoparticles were formed inside these porous nanocubes without disturbing this arrangement. The formation of a stable monolayer was evidenced from the surface pressure-area (P-A) isotherm. The development of Au nanoparticles was confirmed with great effort from a comprehensive study using UV-Vis spectroscopy, XRD, XPS, FTIR, TEM, STEM, EDX, tomography and chemical mapping.

1 aDas, Subhasis1 aBhattacharjee, Gourab1 aSatpati, Biswarup1 aKumar, Mukesh1 aDeka, Sasanka1 aGhosalya, Manoj, Kumar1 aGopinath, Chinnakonda, S.1 aBala, Tanushree uhttps://library.ncl.res.in/content/deposition-au-nanoparticles-inside-porous-ceo2-nanocubes-using-langmuir-blodgett-technique01457nas a2200193 4500008004100000022001400041245011500055210006900170260000800239300001700247490000700264520073800271100002201009700002601031700002701057700002701084700002001111856013201131 2018 eng d a1144-054600a Organic phase transmetallation approach for synthesis of hollow Ni-Au nanocomposites with tunable cavity size0 aOrganic phase transmetallation approach for synthesis of hollow  cDEC a 19615-196240 v423 a

Ni-Au nanocomposites in the form of hollow spheres with controlled cavity size have been successfully synthesized by the transmetallation reaction between hydrophobized Ni nanoparticles and hydrophobized Au precursors. This can be considered as a fairly unique synthesis strategy that does not require any additional external reductants. The synthesis is carried out in a nonpolar solvent and precise tuning of the cavity size has been achieved only by varying the ratio of the two reacting components. A detailed characterization has been performed via UV-vis spectroscopy, XPS, TEM, EDAX, and SEM. The mechanistic aspect is established from FTIR. SQUID-VSM confirmed the magnificent superparamagnetism of the nanocomposites.

1 aSardar, Debasmita1 aAhmed, Md, Azaharuddi1 aBandyopadhyay, Sudipta1 aGhosalya, Manoj, Kumar1 aBala, Tanushree uhttps://library.ncl.res.in/content/organic-phase-transmetallation-approach-synthesis-hollow-ni-au-nanocomposites-tunable-cavity01700nas a2200265 4500008004100000022001400041245012000055210006900175260000900244300001400253490000600267520079100273653002901064653001401093653001801107653002901125653002501154100001801179700002601197700002201223700002201245700002701267700002001294856012001314 2019 eng d a2365-654900aDexterous route for synthesis of hollow spherical ZnO and ZnO-Ag nanocomposite with superior photocatalytic ability0 aDexterous route for synthesis of hollow spherical ZnO and ZnOAg  cMAY  a5518-55260 v43 a

Hollow spherical ZnO and hollow ZnO-Ag nanocomposites with variable percentage of loading of Ag content were successfully fabricated through a novel, template free and easily reproducible route. Extensive characterizations were carried out using FTIR, XRD, XPS, BET, TEM and SEM. The hollow morphology of the particle and the composite encouraged a detailed photocatalysis study in comparison to solid commercial ZnO and the corresponding ZnO-Ag composite. The photocatalytic activity of the hollow particle and the composite was assessed monitoring the decolouration of methylene blue dye using UV-Vis absorption spectroscopic technique. An increased surface area for hollow morphology as compared to solid particles established a conspicuous boost in photocatalytic activity.

10aexcellent photocatalysis10asynthesis10atemplate free10aZnO hollow nanoparticles10aZnO-Ag nanocomposite1 aMaity, Jayeta1 aBhattacharjee, Gourab1 aSatpati, Biswarup1 aSardar, Debasmita1 aGhosalya, Manoj, Kumar1 aBala, Tanushree uhttps://library.ncl.res.in/content/dexterous-route-synthesis-hollow-spherical-zno-and-zno-ag-nanocomposite-superior