01898nas a2200289   4500008004100000020002200041245011100063210006900174260012200243520086400365653000801229653001201237653000901249653001901258653001901277100002501296700001901321700001401340700001901354700002201373700001801395700001801413700001301431700002101444700001601465856012701481       2014                        eng d  a978-0-7354-1225-500aElectrokinetic properties of PMAA functionalized NiFe2O4 nanoparticles synthesized by thermal plasma route0 aElectrokinetic properties of PMAA functionalized NiFe2O4 nanopar  a2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USAbBoard Res Nucl Sci; Dept Atom Energy; Govt IndiacDEC3 a<p>The magnetic nickel ferrite (NiFe2O4) nanoparticles with an average size of 30nm were synthesised by Transferred arc DC Thermal Plasma route. The synthesized nickel ferrite nanoparticles were characterized by TEM and FTIR techniques. The synthesized nickel ferrite nanoparticles were further functionalized with PMAA (polymethacrylic acid) by self emulsion polymerization method and subsequently were characterized by FTIR and Zeta Analyzer. The variation of zeta potential with pH was systematically studied for both PMAA functionalized (PNFO) and uncoated nickel ferrite nanoparticles (NFO). The IEP (isoelectric points) for PNFO and NFO was determined from the graph of zeta potential vs pH. It was observed that the IEP for NFO was at 7.20 and for PNFO it was 2.52. The decrease in IEP of PNFO was attributed to the COOH functional group of PMAA.</p>
10aIEP10aNiFe2O410aPMAA10aThermal plasma10aZeta potential1 aBhosale, Shivaji, V.1 aMhaske, Pravin1 aKanhe, N.1 aNavale, A., B.1 aBhoraskar, S., V.1 aMathe, V., L.1 aBhatt, S., K.1 aMurli, C1 aBhattacharyya, D1 aGadkari, SC  uhttps://library.ncl.res.in/content/electrokinetic-properties-pmaa-functionalized-nife2o4-nanoparticles-synthesized-thermal02574nas a2200205   4500008004100000245017100041210006900212260000800281300002700289490000800316520177100324100002302095700001802118700002102136700001802157700002202175700002402197700002202221856012502243       2016                        eng d00aSurface chemical bonds, surface-enhanced Raman scattering, and dielectric constant of SiO2 nanospheres in-situ decorated with Ag-nanoparticles by electron-irradiation0 aSurface chemical bonds surfaceenhanced Raman scattering and diel  cDEC  aArticle Number: 2349010 v1203 aNanostructures of dielectric materials decorated with metal nanoparticles are of great scientific interest; however, the involved synthesis methods are complicated and require multistep chemical processing, including functionalization of the dielectric surfaces. In the present work, without chemical processes, silver nanoparticles of average sizes in the range of 11 to 15 nm were in-situ synthesized and decorated on SiO2 nanospheres in a single step process by irradiating a solution (AgNO3-polyvinylpyrrolidone (PVP)-SiO2 nanospheres) with 6 MeV electrons at 1.5 x 10(15) e(-)/cm(2), 3.0 x 10(15) e(-)/cm(2), and 4.5 x 10(15) e(-)/cm(2) fluences. The electron irradiated solutions were characterized with different surface and other techniques. The results revealed that the SiO2 nanospheres were uniformly decorated with Ag nanoparticles, and the prominent chemical bonds involved were Ag-O, Si-O-Ag, and Si-Ag. Moreover, the sizes and the decoration density of Ag nanoparticles could be tailored by varying electron fluence. The Surface-enhanced Raman scattering (SERS) of 4-aminothiophenol (4-ATP) solutions was studied using substrates in the form of thin coatings of the solutions of Ag-decorated SiO2 nanospheres. The appearance of the characteristic SERS peaks of both 4-ATP and 4, 4'-dimercaptoazobenzene (4, 4'-DMAB) in Raman spectra confirmed the conversion of a fraction of 4-ATP into 4, 4'-DMAB in the presence of Ag nanoparticles. Composites in the form of thin films were synthesized from the mixture solutions of PVP and Ag-decorated SiO2 nanospheres. The dielectric constant of each thin film was higher as compared to polymers, and could be tailored by varying electron fluence used for decorating Ag nanoparticles. Published by AIP Publishing.1 aPhatangare, A., B.1 aDhole, S., D.1 aDahiwale, S., S.1 aMathe, V., L.1 aBhoraskar, S., V.1 aLate, Dattatray, J.1 aBhoraskar, V., N.  uhttps://library.ncl.res.in/content/surface-chemical-bonds-surface-enhanced-raman-scattering-and-dielectric-constant-sio2