@article { ISI:000258026000010, title = {Synthesis and characterizations of NiTiO(3) nanoparticles prepared by the sol-gel process}, journal = {Philosophical Magazine Letters}, volume = {88}, number = {6}, year = {2008}, month = {MAR}, pages = {467-472}, publisher = {TAYLOR \& FRANCIS LTD}, type = {Article}, address = {4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}, abstract = {

Nanocrystalline nickel titanate (NiTiO(3)) composite powders were prepared by the sol-gel process combined with a surfactant-assisted template method. The resulting powders were calcined at different temperatures ranging from 150 degrees C to 750 degrees C for 2 h in air. The results revealed that a pure hexagonal phase of NiTiO(3) could be obtained at the low temperature of 750 degrees C. The phase evolution of NiTiO(3) was investigated by X-ray diffraction patterns, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Particle size and morphology were studied by transmission electron microscopy.

}, keywords = {Nanoparticles, nickel titanate, sol-gel process}, issn = {0950-0839}, doi = {10.1080/09500830802199709}, author = {Gambhire, A. B. and Lande, Machhindra K. and Kalokhe, S. B. and Mandale, A. B. and Patil, K. R. and Gholap, Ramkrishna S. and Arbad, B. R.} } @article { ISI:000271238900017, title = {Concurrent In-situ formation of Ag/Ag2S nanoparticles in polymer matrix by facile polymer-inorganic solid state reaction}, journal = {Journal of Nano Research}, volume = {5}, year = {2009}, month = {JAN}, pages = {143-152}, publisher = {TRANS TECH PUBLICATIONS LTD}, address = {LAUBISRUTISTR 24, STAFA-ZUERICH, CH-8712, SWITZERLAND}, abstract = {

We herein report the feasibility of polymer-inorganic solid-state reaction route for simultaneous in situ generation of Ag \& Ag2S nanostructures in polymer network wherein an engineering thermoplastic, polyphenylene sulphide (PPS), itself acts as a chalcogen source as well as a stabilizing matrix for the resultant nanoproducts. Typical solid-state reaction was accomplished by simply heating the physical admixture of the two reactants i.e. AgNO3 and PPS by varying molar ratios mainly 1:1, 1:5, 1:15, 1:20, at the crystalline melting temperature (285 degrees C) of PPS. The synthesized nanoparticles were characterized by various physico-chemical techniques like X-ray Diffractometry, Scanning Electron Microscopy equipped with EDAX, Transmission Electron Microscopy and UV-Visible spectroscopy. The prima facie observations suggest the effective formation and subsequent entrapment of mainly nanocrystalline metallic silver (fcc) in PPS matrix for all the molar ratios chosen for the reaction. Additionally, simultaneous occurrence of nanocrystalline Ag2S (monoclinic phase) is also noticed in case of heated admixture of AgNO3: PPS with equimolar ratio. The TEM analysis reveals nanoscale polydispersity (5nm to 70nm) and prevalence of mainly spherical morphological features in all the cases with occasional indications of triangular and hexagonal morphological features depending upon the reaction molar ratio.

}, keywords = {Ag, Ag2S, Nanoparticles, Polymer inorganic solid -state reaction, Thermoplastic polymer matrix}, issn = {1662-5250}, doi = {10.4028/www.scientific.net/JNanoR.5.143}, author = {Waghmare, Sujata and Shinde, Manish and Gholap, Ramkrishna S. and Rao, N. Koteswara and Hawaldar, Ranjit R. and Mulik, Uttam P. and Amalnerkar, Dinesh P.} } @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} }