http://nopr.niscair.res.in/handle/123456789/11884 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/11908 Title: Synthesis of crosslinked poly(vinyl alcohol) and studies on its efficiency in zinc ion uptake from aqueous solution <br/> <br/>Authors: Chowdhury, P; Mukherjee, A; Singha, B <br/> <br/>Abstract: Crosslinking of polyvinyl alcohol by methylene bis acrylamide has been carried out for binding Zn(II) cations from aqueous solution. Metal ion uptake capacity of the crosslinked polymer has been evaluated in the light of varying <i>p</i>H, temperature, time and concentration by batch equilibrium procedure. The polymer has been characterized by chemical, TGA and FTIR data. Surface morphology has been studied with the help of SEM images. Zn(II) has been isolated quantitatively from various synthetic mixtures containing metal ions (Ni(II), Cd(II) and Cu(II)) commonly found in the effluent of galvanization industry. The method has also been tested by analyzing real alloy samples. <br/> <br/>Page(s): 802-806 http://nopr.niscair.res.in/handle/123456789/11907 Title: Growth of nanosized cupric sulphate–urea complex in aqueous medium and its characterization <br/> <br/>Authors: Das, Ishwar; Ansari, Shoeb A; Agrawal, N R <br/> <br/>Abstract: Cupric sulphate-urea complex has been prepared in aqueous medium and growth morphologies of complex and reactants have been compared. Morphology of the complex is different as compared to those of the individual reactants. UV-vis spectra of pure cupric sulphate and aqueous solutions of complex prepared in different cupric sulphate and urea ratio show the maximum shift in λ_max when the molar ratio of cupric sulphate and urea is 1:2. Detailed investigation of the 1:2 complex has been carried out by IR, powder X-ray diffraction, thermogravimetry, differential thermal analysis and electron spin resonance studies. Surface topology of the complex has been studied by atomic force microscopy and the particle diameter observed by transmission electron microscopy. Nanosized complex is formed with particle diameter in the range 24-120 nm, while the average thickness of the particle is in the range of 634 -1260 nm. <br/> <br/>Page(s): 798-801 http://nopr.niscair.res.in/handle/123456789/11906 Title: FT-IR and FT-Raman spectral studies and DFT calculations of tautomeric forms of benzaldehyde-<i style="">N</i>(4)-phenylsemicarbazone <br/> <br/>Authors: Siji, V L; Sudarsanakumar, M R; Suma, S; George, Abraham; Thomas, P V <br/> <br/>Abstract: The vibrational wave numbers of the keto and enol forms of benzaldehyde-<i style="">N</i>(4)-phenylsemicarbazone have been computed using B3LYP/6-311++G** level of theory and compared with experimental FT-IR and FT-Raman data. Optimized geometrical parameters of the title compound are in agreement with the reported structures. The calculated first hyperpolarizability is comparable with the reported values of similar derivatives and is an attractive object for future studies on non-linear optics. The extended π-electron delocalization over the semicarbazone moiety is responsible for the nonlinearity of the molecule. <br/> <br/>Page(s): 793-797 http://nopr.niscair.res.in/handle/123456789/11905 Title: Eutectic mixture-directed kinetics of Diels-Alder reaction <br/> <br/>Authors: Nagare, Amit S; Kumar, Anil <br/> <br/>Abstract: In the search for environmentally benign solvent media, a new class of solvents composed of mixtures of carbohydrates with urea or methylated urea has been noted to be effective in enhancing the reaction rates of a bimolecular organic reaction like the Diels-Alder reaction of cyclopentadiene with methyl acrylate. The viscosity of these media appears to be an important parameter in controlling the second order kinetics. <br/> <br/>Page(s): 788-792