01857nas a2200277 4500008004100000022001400041245008900055210006900144260007300213300001400286490000800300520093600308653001301244653001701257653001801274653001901292100002001311700001501331700001801346700001801364700002101382700002201403700001701425700002501442856011201467 2008 eng d a0022-309300aSilicate nanoparticles by bioleaching of glass and modification of the glass surface0 aSilicate nanoparticles by bioleaching of glass and modification  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL a3433-34370 v3543 a

Bioleaching is examined as a low temperature (50 degrees C) soft chemical approach to nanosynthesis and surface processing. We demonstrate that fungus based bioleaching of borosilicate glass enables synthesis of nearly monodispersed ultrafine (similar to 5 +/- 0.5 nm) silicate nanoparticles. Using various techniques such as X-ray diffraction, X-ray photoelectron spectroscopy and FTIR we compare the constitution and composition of the nanoparticles with that of the parent glass, and establish the basic similarities between the two. The bioleaching process is shown to enhance the non-bridging oxygen component and correspondingly influence the Si-O-Si network. The root mean square roughness of glass surface is seen to increase from 1.27 nm for bare glass to 2.52 nm for 15 h fungal processed case, this increase being equivalent to that for glass annealed at 500 degrees C. (c) 2008 Elsevier B.V. All rights reserved.

10aBioglass10aBiomaterials10aborosilicates10anarroparticles1 aKulkarni, Sneha1 aSyed, Asad1 aSingh, Sanjay1 aGaikwad, Anil1 aPatil, Kashinath1 aVijayamohanan, K.1 aAhmad, Absar1 aOgale, Satishchandra uhttp://library.ncl.res.in/content/silicate-nanoparticles-bioleaching-glass-and-modification-glass-surface-001893nas a2200241 4500008004100000022001400041245009000055210006900145260007700214300001400291490000700305520103300312100002001345700001601365700002501381700001401406700002001420700002001440700002201460700002501482700002401507856012001531 2014 eng d a1616-301X00aScaling behavior of resistive switching in epitaxial bismuth ferrite heterostructures0 aScaling behavior of resistive switching in epitaxial bismuth fer aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJUL a3962-39690 v243 a

Resistive switching (RS) of (001) epitaxial multiferroic BiFeO3/La0.67Sr0.33MnO3/SrTiO3 heterostructures is investigated for varying lengths scales in both the thickness and lateral directions. Macroscale current-voltage analyses in conjunction with local conduction atomic force microscopy (CAFM) reveal that whilst both the local and global resistive states are strongly driven by polarization direction, the type of conduction mechanism is different for each distinct thickness regime. Electrode-area dependent studies confirm the RS is dominated by an interface mechanism and not by filamentary formation. Furthermore, CAFM maps allow deconvolution of the roles played by domains and domain walls during the RS process. It is shown that the net polarization direction, and not domain walls, controls the conduction process. An interface mechanism based on barrier height and width alteration due to polarization reversal is proposed, and the role of electronic reconstruction at the interface is further investigated.

1 aRana, Abhimanyu1 aLu, Haidong1 aBogle, Kashinath, A.1 aZhang, Qi1 aVasudevan, Rama1 aThakare, Vishal1 aGruverman, Alexei1 aOgale, Satishchandra1 aValanoor, Nagarajan uhttp://library.ncl.res.in/content/scaling-behavior-resistive-switching-epitaxial-bismuth-ferrite-heterostructures-001432nas a2200205 4500008004100000022001400041245012600055210006900181260011000250300001600360490000600376520058500382100001900967700002000986700002401006700002201030700002601052700002501078856012301103 2014 eng d a2046-206900aSurfactant free gram scale synthesis of mesoporous Ni(OH)(2)-r-GO nanocomposite for high rate pseudocapacitor application0 aSurfactant free gram scale synthesis of mesoporous NiOH2rGO nano aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAUG a39875-398830 v43 a

We report a single-step surfactant-free gram scale hydrothermal synthesis of mesoporous Ni(OH)(2) nanoparticles and the Ni(OH)(2)-reduced graphene oxide (Ni(OH)(2)-r-GO) nanocomposite. Interesting morphological features are noted. These nanomaterials are examined and compared as cathode materials for pseudo-capacitor application through detailed characterizations. A high specific capacitance (C-s) of 1538 F g(-1) is observed for Ni(OH)(2)-r-GO even at a high current density of 40 A g(-1), whereas at the same current rate, bare Ni(OH)(2) shows C-s of only 936 F g(-1).

1 aSingh, Upendra1 aBanerjee, Abhik1 aMhamane, Dattakumar1 aSuryawanshi, Anil1 aUpadhyay, Kush, Kumar1 aOgale, Satishchandra uhttp://library.ncl.res.in/content/surfactant-free-gram-scale-synthesis-mesoporous-nioh2-r-go-nanocomposite-high-rate-002022nas a2200193 4500008004100000022001400041245017300055210006900228260011000297300001400407490000700421520115700428100001901585700002501604700002301629700002401652700002501676856012701701 2014 eng d a1463-907600aSynthesis of an efficient heteroatom-doped carbon electro-catalyst for oxygen reduction reaction by pyrolysis of protein-rich pulse flour cooked with SiO2 nanoparticles0 aSynthesis of an efficient heteroatomdoped carbon electrocatalyst aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJAN a4251-42590 v163 a

Development of a highly durable, fuel-tolerant, metal-free electro-catalyst for oxygen reduction reaction (ORR) is essential for robust and cost-effective Anion Exchange Membrane Fuel Cells (AEMFCs). Herein, we report the development of a nitrogen-doped (N-doped) hierarchically porous carbon-based efficient ORR electrocatalyst from protein-rich pulses. The process involves 3D silica nanoparticle templating of the pulse flour(s) followed by their double pyrolysis. The detailed experiments are performed on gram flour (derived from chickpeas) without any in situ/ex situ addition of dopants. The N-doped porous carbon thus generated shows remarkable electrocatalytic activity towards ORR in the alkaline medium. The oxygen reduction on this material follows the desired 4-electron transfer mechanism involving the direct reduction pathway. Additionally, the synthesized carbon catalyst also exhibits good electrochemical stability and fuel tolerance. The results are also obtained and compared with the case of soybean flour having higher nitrogen content to highlight the significance of different parameters in the ORR catalyst performance.

1 aGokhale, Rohan1 aUnni, SreeKuttan, M.1 aPuthusseri, Dhanya1 aKurungot, Sreekumar1 aOgale, Satishchandra uhttp://library.ncl.res.in/content/synthesis-efficient-heteroatom-doped-carbon-electro-catalyst-oxygen-reduction-reaction-002443nas a2200205 4500008004100000022001400041245016900055210006900224260011000293300001600403490000700419520155700426100002401983700001802007700002502025700001802050700002502068700001702093856012702110 2015 eng d a1463-907600aSingle-layer graphene-assembled 3D porous carbon composites with PVA and Fe3O4 nano-fillers: an interface-mediated superior dielectric and EMI shielding performance0 aSinglelayer grapheneassembled 3D porous carbon composites with P aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUN a18353-183630 v173 a

In this study, a novel composite of Fe3O4 nanofiller-decorated single-layer graphene-assembled porous carbon (SLGAPC) with polyvinyl alcohol (PVA) having flexibility and a density of 0.75 g cm(-3) is explored for its dielectric and electromagnetic interference (EMI) response properties. The composite is prepared by the solution casting method and its constituents are optimized as 15 wt% SLGAPC and 20 wt% Fe3O4 through a novel solvent relaxation nuclear magnetic resonance experiment. The PVA-SLGAPC-Fe3O4 composite shows high dielectric permittivity in the range of 1 Hz-10 MHz, enhanced by a factor of 4 as compared to that of the PVA-SLGAPC composite, with a reduced loss by a factor of 2. The temperature dependent dielectric properties reveal the activation energy behaviour with reference to the glass transition temperature (80 degrees C) of PVA. The dielectric hysteresis with the temperature cycle reveals a remnant polarization. The enhanced dielectric properties are suggested to be the result of improvement in the localized polarization of the integrated interface system (Maxwell-Wagner-Sillars (MWS) polarization) formed by the uniform adsorption of Fe3O4 on the surface of SLGAPC conjugated with PVA. The EMI shielding property of the composite with a low thickness of 0.3 mm in the X-band (8.2-12.4 GHz) shows a very impressive shielding efficiency of similar to 15 dB and a specific shielding effectiveness of 20 dB (g cm(-3))(-1), indicating the promising character of this material for flexible EMI shielding applications.

1 aRao, B., V. Bhaskar1 aYadav, Prasad1 aAepuru, Radhamanohar1 aPanda, H., S.1 aOgale, Satishchandra1 aKale, S., N. uhttp://library.ncl.res.in/content/single-layer-graphene-assembled-3d-porous-carbon-composites-pva-and-fe3o4-nano-fillers-001467nas a2200193 4500008004100000245010200041210006900143260000800212300001400220490000700234520077400241100002001015700002101035700001901056700002401075700002201099700002501121856012701146 2017 eng d00aSynthetic manipulation of hybrid perovskite systems in search of new and enhanced functionalities0 aSynthetic manipulation of hybrid perovskite systems in search of cOCT a3722-37390 v103 aOver the past few years the organic-inorganic hybrid perovskite systems have emerged as a promising class of materials for photovoltaic and electroluminescent thin-film device applications, in view of their unique set of tunable optoelectronic properties. Importantly, these materials can be easily solution-processed at low temperatures and as such are amenable to facile molecular engineering. Thus, a variety of low-dimensional forms and quantum structures of these materials can be obtained through strategic synthetic manipulations through small molecule incorporation or molecular ion doping. In this Minireview, we specifically focus on these approaches and outline the possibilities of utilizing these for enhanced functionalities and newer application domains.1 aNaphade, Rounak1 aNagane, Satyawan1 aBansode, Umesh1 aTathavadekar, Mukta1 aSadhanala, Aditya1 aOgale, Satishchandra uhttp://library.ncl.res.in/content/synthetic-manipulation-hybrid-perovskite-systems-search-new-and-enhanced-functionalities