http://nopr.niscair.res.in/handle/123456789/10832 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/10854 Title: Synthesis and characterization of metal and metal oxide sponges using Triton X-165 as sacrificial template <br/> <br/>Authors: Khan, Farid; Bilgainya, Ruchi <br/> <br/>Abstract: Silver, gold and copper oxide sponges have been synthesized via thermal treatment using Triton X–165 as sacrificial template. Scanning electron microscopy, X-ray diffraction, Thermogravimetric analysis and Brunauer–Emmett-Teller adsorption isotherms techniques are used to characterize the monoliths. Additives like dextran, silica nanoparticles and 1,3,5 trimethylbenzene significantly affect the pore size of the monoliths from 50 nm to 50 µm. The surface area of Au/Triton X-165 / dextran monolith has been determined to be 8.26 m²/g, which is greater than that of any pure metal. <br/> <br/>Page(s): 55-59 http://nopr.niscair.res.in/handle/123456789/10853 Title: Three new inorganic-organic hybrid materials based on inorganic cluster, [(PO₄)M₁₂O₃₆].nH₂O (M = Mo, W) <br/> <br/>Authors: Yousefi, Mohammad; Eshtiagh-Hosseini, Hossein; Mirzaei, Masoud; Salimi, Ali R.; Nikpour, Mohsen <br/> <br/>Abstract: Three new inorganic-organic hybrid materials based on heteropolyoxometalates, [L-C₆H₁₄NO₂]₃[(PO₄)Mo₁₂O₃₆].3H₂O (<b>1</b>), [L-C₅H₁₀NO₂]₃[(PO₄)W₁₂O₃₆].H₂O (<b>2</b>), and [C₂H₇N₂O]₃[(PO₄)W₁₂O₃₆].4H₂O (<b>3</b>), where C₆H₁₄NO₂, C₅H₁₀NO₂, and C₂H₇N₂O are protonated l-leucine, l-proline, and methyl urea, respectively, have been synthesized and structurally characterized by some physico-chemical methods. Elemental analyses, IR, Raman, mass, UV, and ¹H NMR spectroscopies of the title hybrid materials indicate that there are van der Waals interactions between O atoms of the heteropolyoxometalates and water molecules, as well as the N and O atoms of the amino acids and methyl urea moieties. The molecular structures of synthesized hybrid materials contain discrete entities of l-leucinium, l-prolinium or methyluronium and water molecules that surround every [(PO₄)M₁₂O₃₆]^3- anion, over the extended crystalline network. The observed bands in Raman spectra of <b style="">(2) </b>and<b style=""> (3) </b>demonstrate that the [(PO₄)W₁₂O₃₆]^3- anion retains its “Keggin structure”. At <i>p</i>H = 4 – 7, the characteristic bands of the Keggin anion [(PO₄)M₁₂O₃₆]³⁻(M = Mo, W) appear at 210 and 260 nm in the UV spectra, respectively. <br/> <br/>Page(s): 51-54 http://nopr.niscair.res.in/handle/123456789/10852 Title: Experimental and theoretical studies on sensing adenine by Ag, Au and Ag-Au bimetallic nanoparticles <br/> <br/>Authors: Arikrishnan, J; Sheerin, S K Tabasum; Murugavelu, M; Karthikeyan, B <br/> <br/>Abstract: Experimental and theoretical studies on sensing adenine by silver, gold and silver-gold bimetallic nanoparticles are reported. UV-visible spectroscopy has been used to study the surface plasmon resonance changes. The vibrational frequencies of adenine and silver complexed adenine have been compared with the HF theoretically calculated frequencies. It is demonstrated that adenine is adsorbed on the nanometallic surfaces through chemisorption and this property can be effectively used to sense adenine. <br/> <br/>Page(s): 46-50 http://nopr.niscair.res.in/handle/123456789/10851 Title: A novel route to size and shape controlled synthesis of DMSO capped ruthenium dioxide nanoparticles <br/> <br/>Authors: Borah, Geetika; Sharma, Ponchami <br/> <br/>Abstract: Ruthenium dioxide nanoparticles (RuO₂) with an average particle size of 54-95 nm are readily synthesized from RuCl₃.xH₂O via the formation of ruthenium acetylacetone. The particle size of RuO₂ nanoparticle increases with increase in calcination time at 800 °C. The ruthenium dioxide nanoparticles have also been capped with DMSO to make them soluble in common organic solvents. These synthesized nanocrystallites have been characterized by FTIR, UV-vis, SEM-EDX, ¹H NMR, magnetic measurements and XRD techniques. The XRD pattern demonstrates the crystalline nature of these nanoparticles. The downfield shift of ν_S=O frequency (∆ν=74 cm^-1) in FTIR, as well as SEM-EDX and ¹H NMR spectra of the capped RuO₂nanoparticle confirm the capping with DMSO. UV-vis analysis shows that the absorption peak is blue-shifted with decrease of particle size. Magnetic measurements show that these nano oxides have nearly zero magnetic remanence, a linear response of magnetization and finally reach saturation magnetization at low external field in the range 2625-2650 Oe. <br/> <br/>Page(s): 41-45