02462nas a2200253   4500008004100000022001400041245010400055210006900159260005700228300001200285490000600297520161200303653001801915653001501933653001001948653000901958653001801967653001101985100001901996700002002015700001902035700002402054856013002078       2009                        eng d  a1557-195500aSilver fused conducting fiber formation of Au-Ag core-shell nanoparticles mediated by ascorbic acid0 aSilver fused conducting fiber formation of AuAg coreshell nanopa  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcJUN  a161-1700 v43 a<p>In this paper, we report the spontaneous formation of fibrous structures consisting of assemblies of Au-Ag core-shell nanoparticles (NPs) from a solution consisting of Au-Ag core-shell NPs and l-ascorbic acid (AA). AA acted both as the reducing agent for the generation of NPs and also as the mediator for the formation of fibers. The process of fiber formation involved three steps-reduction of HAuCl(4) to Au NPs by AA, subsequent formation of Au-Ag core-shell NPs after addition of AgNO(3), and spontaneous formation of fibers from the mixtures in water. It took typically about 30 days to form complete fibers that are of lengths of several hundred micrometers to millimeters, although nanofibers started forming from the first day of solution preparation. The width of each of these fibers was typically about 1-4 A mu m with length of each segment of fiber bundle, on the order of 40 A mu m. Formation of fibers was also observed in absence of AgNO(3). These fibers consisted of Au NPs and polymer of AA degradation products and were not electrically conducting. Also, low concentrations of AgNO(3) produced fibers with low electrical conductivity. However, it was observed that increase in the amount of AgNO(3) leads to the formation of fibers that were electrically conducting with conductivity values in the range of metallic conductivity. Spectroscopic and electron microscopic investigations were carried out to establish the formation of fibers. The details of fiber formation mechanism under different conditions and electrical conductivities of the fibers are discussed in the article.</p>10aAscorbic acid10acore-shell10aFiber10aGold10aNanoparticles10aSilver1 aMurugadoss, A.1 aKar, Manoranjan1 aPasricha, Renu1 aChattopadhyay, Arun  uhttps://library.ncl.res.in/content/silver-fused-conducting-fiber-formation-au-ag-core-shell-nanoparticles-mediated-ascorbic-002141nas a2200265   4500008004100000022001400041245015400055210006900209260010600278300001400384490000700398520101700405653003501422653001801457653005001475653002601525653001301551653003801564653004801602100002401650700002401674700002501698700002301723856012901746       2010                        eng d  a0013-468600aFabrication, characterization and electrochemical performance of single strand carbon fiber prepared by catalytic chemical vapor decomposition method0 aFabrication characterization and electrochemical performance of   aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcFEB  a2022-20280 v553 a<p>Preparation, fabrication and voltammetric characterizations of a single strand of carbon fiber (SSCF) electrode and their potential applications for biosensor are presented. SSCFs of diameter ca. 10 +/- 2 mu m and few millimeters in length are prepared by catalytic chemical vapor decomposition (CCVD) method. Voltammetry with potassium ferricyanide. alpha-methylferrocene methanol and hexaammineruthenium(III) chloride on SSCF electrode are used as bench marks to validate the electrode properties. Quasi-steady state voltammograms obtained were fitted into a cylindrical diffusion model From which, the standard rate constant (k(0)) and electron transfer coefficient (alpha) are obtained. The use of SSCF electrode is demonstrated for the voltammetric detection of the micromolar quantity of dopamine in the presence of large excess (ca. 200 times) of ascorbic acid, without any fouling of electrode surface. The kinetics of electron transfer are investigated. (C) 2009 Elsevier Ltd All rights reserved.</p>10aalpha-Methylferrocene methanol10aAscorbic acid10aCatalytic chemical vapor decomposition (CCVD)10aCylindrical diffusion10adopamine10aHexaammineruthenium(III) chloride10aSingle strand carbon fiber (SSCF) electrode1 aJoshi, Vrushali, S.1 aGokhale, Suresh, P.1 aPatil, Kashinath, R.1 aHaram, Santosh, K.  uhttps://library.ncl.res.in/content/fabrication-characterization-and-electrochemical-performance-single-strand-carbon-fiber-002520nas a2200289   4500008004100000022001400041245010300055210006900158260000800227300001100235490000800246520160800254653001801862653001401880653001601894653002101910653002701931653002101958100001901979700001701998700001402015700001602029700001702045700002302062700001602085856012902101       2022                        eng d  a0169-131700aNa-montmorillonite to Fe(II)-Mt using ferrous citrate/ascorbate obtained by dissolving iron powder0 aNamontmorillonite to FeIIMt using ferrous citrateascorbate obtai  cFEB  a1063960 v2173 aBentonite containing montmorillonite (Mt) as the major clay mineral is the potential buffer material of engineered barrier system in the deep geological repository for high-level waste management. The corrosion products of canister/or overpack material (carbon steel) may alter the basic characteristics of bentonite through Fe/clay interaction and formation of FeMt to certain extent. A convenient method is required for quantitative preparation of Fe(II)-Mt because the only few direct methods reported have some limitations. For this, weak ferrous complexes having good solubility to facilitate the cation-exchange with bentonite is essential. Therefore, Fe(II)-citrate, Fe(II)-ascorbate and Fe(II)-citrate/ascorbate were obtained here by dissolving the iron powder (Fe0) in citric acid (CA), ascorbic acid (AA) and their equimolar mixtures from 25 mM to 300 mM at 70 °C under N2 atmosphere. The redox potential was measured to monitor the dissolution of Fe0 in these mild organic acids. Higher dissolution of Fe0 occurred in CA + AA mixture. The dissolved iron in the form of ferrous complex was reasonably stable in inert atmosphere, Fe2+/Fetotal ≈ 1. The parent clay mineral (bentonite, NaMt) was treated with Fe(II) − cit/asc to form Fe(II) − Mt. through cation exchange process. The CEC and ferrous to ferric ratio of the Fe(II)-Mt was close to the stoichiometric amount. The XRF, XRD, ac impedance, FT-IR, TGA/DSC, XPS and FE-SEM are used for further characterization. In-situ complexation reaction of interlayer Fe2+ ions in Fe(II)-Mt with o-phenanthroline was also observed.10aAscorbic acid10aBentonite10aCitric acid10aCr(VI) reduction10aFe(II)-montmorillonite10aIron dissolution1 aChikkamath, S.1 aManjanna, J.1 aMomin, N.1 aHegde, B.G.1 aNayaka, G.P.1 aKar, Aishwarya, S.1 aTomar, B.S.  uhttps://library.ncl.res.in/content/na-montmorillonite-feii-mt-using-ferrous-citrateascorbate-obtained-dissolving-iron-powder