02946nas a2200241 4500008004100000022001400041245013500055210006900190260009500259300001200354490000800366520202500374653001302399653000902412653001902421653004502440653001102485100002002496700001402516700003002530700001502560856012902575 2005 eng d a0021-979700aPhase transfer of oleic acid capped NicoreAgshell nanoparticles assisted by the flexibility of oleic acid on the surface of silver0 aPhase transfer of oleic acid capped NicoreAgshell nanoparticles  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcMAR a422-4310 v2833 a

The phase transfer protocols in vogue for the oleic acid capped silver nanoparticles, viz., salt-induced precipitation and redispersion or phosphoric acid-induced method, are examined and compared thoroughly. A comprehensive evaluation with respect to the mechanistic aspects involved is made and the merits and demerits of the different procedures are delineated. It is found that the salt-induced precipitation and redispersion is more versatile in that the precipitate can actually be redispersed in both aqueous and organic media. However, in terms of mechanism both the routes seem to be very similar wherein the orientational change of oleic acid on the silver surface in the two different environments-organic and aqueous-plays a crucial role in the adaptability of the system to the different environments. Subsequently, this change of orientation of oleic acid on silver surface in aqueous and organic media has been utilized to phase transfer Ni-based nanoparticulate systems. The nascent oleic acid-capped Ni nanoparticles, which were synthesized by a foam-based protocol, were dispersible in water but not in nonpolar organic media such as cyclohexane or toluene. Then, just by coating a thin shell of silver on them we could achieve complete phase transfer of the NicoreAgshell from aqueous to organic media following similar procedures used for oleic acid-capped silver nanoparticles. Here, the phase transfer seems to be facilitated by the orientational flexibility of oleic acid on the silver surface as opposed to other metal surfaces as evidenced from the infrared and thermogravimetric analyses of oleic acid-capped Ni and NicoreAgshell nanoparticles. This orientation-assisted phase transfer method could be generalized and can be adapted to other systems where, if the nascent nanoparticles cannot be phase transferred as is, they can be coated by a silver shell and oleic acid making them suitable for dispersion in both aqueous and organic media. (C) 2004 Elsevier Inc. All rights reserved.

10a(1) HNMR10aFTIR10aPhase transfer10atransmetalation core-shell nanoparticles10aUV-Vis1 aBala, Tanushree1 aSwami, A.1 aPrasad, Bhagavatula L. V.1 aSastry, M. uhttps://library.ncl.res.in/content/phase-transfer-oleic-acid-capped-nicoreagshell-nanoparticles-assisted-flexibility-oleic-001623nas a2200217 4500008004100000022001400041245012800055210006900183260007100252300001400323490000800337520078300345100002401128700002001152700001601172700001701188700001901205700001901224700003001243856013201273 2009 eng d a1932-744700aPreparation of nearly monodisperse nickel nanoparticles by a facile solution based methodology and their ordered assemblies0 aPreparation of nearly monodisperse nickel nanoparticles by a fac a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR a3426-34290 v1133 a

Nickel nanoparticles have been synthesized by a simple wet chemical reduction technique in the presence of a surfactant sodium dodecyl sulfate (SDS) and a capping agent oleic acid. Varying the concentration of the surfactant and the capping agent has been found to critically govern the nature of the nanoparticles prepared. It is observed that at an optimum concentration of SDS and oleic acid, nearly monodisperse Ni nanoparticles are obtained that form highly ordered hexagonally close-packed structures on electron microscopy grids by a simple drop coating procedure. It is also shown that the presence of oleic acid is necessary for the stability of the Ni nanoparticles synthesized. Structural and magnetic characterizations of the nanoparticles are also presented.

1 aSidhaye, Deepti, S.1 aBala, Tanushree1 aSrinath, S.1 aSrikanth, H.1 aPoddar, Pankaj1 aSastry, Murali1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/preparation-nearly-monodisperse-nickel-nanoparticles-facile-solution-based-methodology-and-001631nas a2200193 4500008004100000022001400041245009900055210006900154260007100223300001400294490000700308520087000315100002001185700002501205700003001230700002301260700003001283856012401313 2014 eng d a1528-748300apH-Dependent single-step rapid synthesis of cuo and cu2o nanoparticles from the same precursor0 apHDependent singlestep rapid synthesis of cuo and cu2o nanoparti a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcSEP a4329-43340 v143 a

A single-step protocol to prepare Cu2O and CuO nanocrystalline particles from the same precursor by microwave irradiation has been developed using the pH of the solution as the only variable parameter. The utility of different bivalent Cu-precursors for synthesis of CuO and Cu2O nanoparticles was also investigated. The morphology, phase purity, and optical properties of these nanoparticles were analyzed using TEM, SEM, XRD, and optical spectroscopy. The band edges were determined using cyclic voltammetry. Field effect transistors based on CuO nanoparticles showed a hole mobility of 3.5 x 10(-2) cm(2) V-1 s(-1), making them a suitable candidate for energy-related applications. The effect of hydrazine vapor exposure on the IV-characteristics of CuO nanoparticles was also investigated. This revealed a decrease in source current with respect to time.

1 aNikam, Arun, V.1 aArulkashmir, Arulraj1 aKrishnamoorthy, Kothandam1 aKulkarni, Amol, A.1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/ph-dependent-single-step-rapid-synthesis-cuo-and-cu2o-nanoparticles-same-precursor-001460nas a2200181 4500008004100000022001400041245013300055210006900188260007300257300001000330490000800340520068400348653003701032653002801069100002101097700003001118856013001148 2015 eng d a0927-775700aPreparation of Ag(Shell)-Au(Core) nanoparticles by anti-galvanic reactions: are capping agents the ``real heroes'' of reduction?0 aPreparation of AgShellAuCore nanoparticles by antigalvanic react aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG a30-350 v4783 a

The formation of Ag(shell)-Au(core) nanoparticles by the reduction of Ag+ ions on preformed Au NPs, mediated by the capping agents like dodecylamine is described. We clearly established that while monodisperse Ag(shell)-Au(core) structures can be formed in presence of weak surface binding ligands such as amines, strong binding ligands such as thiols, lead to formation of separate monometallic Au and Ag particles. Apart from highlighting the influence of metal-ligand binding strength on the formation of core-shell nanoparticle architectures, our study also provides an easy means to produce Ag( shell)-Au( core) structures. (C) 2015 Elsevier B.V. All rights reserved.

10aAg(shell)-Au(core) nanoparticles10aAnti-Galvanic reactions1 aSahu, Puspanjali1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/preparation-agshell-aucore-nanoparticles-anti-galvanic-reactions-are-capping-agents-real-101052nas a2200169 4500008004100000245007800041210006900119260000800188300001600196490000700212520046000219100002600679700002200705700001900727700003000746856010600776 2015 eng d00aPreparation of Ni3S2 and Ni3S2-Ni nanosheets via solution based processes0 aPreparation of Ni3S2 and Ni3S2Ni nanosheets via solution based p cMAY a2584–25880 v153 a

An easy and convenient preparation of nanometer-thick sheets of Ni3S2 and Ni3S2–Ni from solution processed molecularly thin sheets of Ni-thiolates is described. Both the Ni3S2 and Ni3S2–Ni possessed sheet-like morphologies and displayed room temperature ferromagnetic characteristics. The ferromagnetic nature of these samples was also confirmed by MFM studies, and AFM/TEM investigations substantiated the sheet-like morphology of the samples.

1 aBusupalli, Balanagulu1 aDate, Kalyani, S.1 aDatar, Suwarna1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/preparation-ni3s2-and-ni3s2-ni-nanosheets-solution-based-processes