http://nopr.niscpr.res.in/handle/123456789/29862 2026-10-12T17:51:09Z http://nopr.niscpr.res.in/handle/123456789/29932 Title: Structural effects of cationic surfactants in polyacrylamide-surfactant interaction: Micellisation/adsorption of polyacrylamide Authors: Niranjan, P S; Upadhyay, S K Abstract: The structural effects of two cationic surfactants, viz., dodecyl trimethyl ammonium bromide and benzalkonium chloride, in polyacrylamide surfactant interactions has been studied. The effect of structural features of the surfactant on the micellization and/or on adsorption has been studied in terms of CMC/C₂₀ ratio. An increase in the polymer content, increasing –CH₂ group in the tail of the cationic surfactant or increasing the bulkiness of the hydrophobic head group of the surfactant favors the adsorption of polymer on the surfacant. Page(s): 1402-1406 2014-11-13T05:51:22Z http://nopr.niscpr.res.in/handle/123456789/29931 Title: Reaction of titanium(IV) tetraisopropoxide with salicylidene-2-aminopyridine and spectral studies Authors: Dubey, Raj Kumar; Singh, Avadhesh Pratap Abstract: Reaction of Ti(OPrⁱ)₄with salicylidene-2-aminopyridine in different molar ratio(s) afforded mononuclear complexes of the type, [(sap)_nTi(OPrⁱ)_4-n] (<b style="mso-bidi-font-weight:normal">1-3</b>), (where n = 1-3; sap = salicylidene-2-aminopyridine). The reaction of complex (<b style="mso-bidi-font-weight:normal">2</b>)<b style="mso-bidi-font-weight:normal"> </b>with N-methyl-diethanolamine in equimolar ratio afforded the complex [(sap)₂Ti(mdea)] (<b style="mso-bidi-font-weight:normal">4</b>). All these complexes have been characterized by elemental (C, H, N and Ti) analyses and spectral (IR, NMR (¹H, ¹³C)) studies. The molecular structure as well as composition of the complexes has been tentatively assigned on the basis of these spectral and mass fragmentation studies. Page(s): 1397-1401 2014-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/29930 Title: New fluorescent chemodosimeter for Cu²⁺ based on Schiff base derived from 1-naphthylamine and 2-chlorobenzaldehyde Authors: Kumar, Jutika; Das, Diganta Kumar Abstract: <span style="letter-spacing:-.2pt;mso-ansi-language: PT-BR" lang="PT-BR">On condensation of 1-naphthylamine with 2-chlorobenzaldehyde, the Schiff base (Z)-N-(2-chlorobenzylidene)naphthalene-1-amine (<b>L</b>) is formed which<span style="mso-ansi-language:PT-BR" lang="PT-BR"> shows moderate fluorescence. <b>L </b>on interaction with Cu²⁺ hydrolyses back into fluorescent 1-naphthylamine and hence acts as fluorescent chemodosimeter for Cu²⁺ by “off-on” mode with an <i>ca.</i> 18 times enhancement in fluorescent intensity (detection limit is 10^-5<i>M</i>). The other hydrolysed product, 2-chlorobenzaldehyde, forms a tris chelate complex with Cu²⁺, as shown by UV/visible spectroscopy and cyclic voltammetry. The metal ions, Na⁺, K⁺, Ca²⁺, Mn²⁺, Fe²⁺, Co²⁺, Ni²⁺, Cd²⁺, Hg²⁺, Pb²⁺ and Ag⁺, do not interfere while in the case of Zn²⁺, moderate interference is observed. </span></span> Page(s): 1391-1396 2014-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/29929 Title: Multifunctional P and Mn co-doped titania nanoparticles as efficient visible light driven photocatalyst Authors: Thota, Susmitha; Tirukkovalluri, Sivarao; Bojja, Sreedhar; Sankar, Girija G Abstract: Phosphorus and manganese co-doped titanium dioxide nanoparticles have been synthesized by sol-gel method and characterized by XRD, UV-visible DRS, XPS, SEM, TEM and BET. XRD data show the anatase phase in all the samples, while XPS analysis shows the dopant phosphorus in the P⁵⁺ state and manganese in the Mn⁴⁺/Mn³⁺ states. The co-doped catalysts show a particle size of 7 nm, with strong absorption in the visible region. The photocatalytic activity of the as-prepared catalysts has been tested by degradation of the azodye, acid orange 7 under artificial light as well as under direct sunlight. Photoluminiscence studies with the co-doped catalysts show enhanced generation of hydroxyl radicals, the key oxidative species in photocatalytic reactions. In addition, the antibacterial activity of the nanoparticles against <i style="mso-bidi-font-style: normal">Escherichia coli </i>has also been investigated<i style="mso-bidi-font-style: normal">. </i>The results indicate that the as co-doped TiO₂ nanoparticles can be used not only as an efficient photocatalyst for potential applications in the fields of pollution abatement process but also as an excellent antibacterial agent. Page(s): 1384-1390 2014-11-13T05:46:31Z