@article { ISI:000232129900020, title = {Synthesis of gold nanospheres and nanotriangles by the Turkevich approach}, journal = {Journal of Nanoscience and Nanotechnology}, volume = {5}, number = {10}, year = {2005}, month = {OCT}, pages = {1721-1727}, publisher = {AMER SCIENTIFIC PUBLISHERS}, type = {Article}, address = {25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USA}, abstract = {

Gold nanoparticles of triangular morphology possess interesting optical properties with potential application in medicine and infrared absorbing coatings, however, little is known about conditions that favor their growth. In this paper, we have reinvestigated a time-tested recipe for the formation of gold nanospheres by citrate reduction of aqueous gold ions under boiling conditions (Turkevich recipe). Our principle findings are that gold nanotriangle formation is kinetically controlled and is highly favored at low temperatures. Furthermore, the presence of chloride ions from the precursor chloroaurate ions plays a major role in promoting the growth of [111] oriented triangular/truncated triangular particles. The presence of bromide and iodide ions that possess the ability to replace surface-bound chloride ions inhibits triangle formation to varying degrees.

}, keywords = {Crystal growth, Gold, halides, nanospheres, nanotriangles, Temperature effect}, issn = {1533-4880}, doi = {10.1166/jnn.2005.192}, author = {Shankar, S. S. and Bhargava, S. and Sastry, Murali} } @article { ISI:000255421300007, title = {Rapid liquid-liquid extraction of thallium(III) from succinate media with 2-octylaminopyirdine in chloroform as the extractant}, journal = {Journal of the Serbian Chemical Society}, volume = {73}, number = {4}, year = {2008}, month = {JAN}, pages = {435-451}, publisher = {SERBIAN CHEMICAL SOC}, address = {KARNEGIJEVA 4, PO BOX 462, YU-11001 BELGRADE, YUGOSLAVIA}, abstract = {

A simple solvent extraction study of thallium(III) was conducted. Selective and quantitative extraction of thallium(III) by 2-octylaminopyridine (2-OAP) in chloroform occurred from aqueous sodium succinate medium (0.0075 M) at pH 3.0. Thallium(III) was back extracted with acetate buffer (pH 4.63). The effect of the concentration of succinate and 2-OAP, the role of various diluents, stripping agents, loading capacity of 2-OAP, equilibrium time and aqueous:organic volume ratio on the extraction of thallium(III) was studied. The stoichiometry of the extracted species was determined based on the slope analysis method and found to be 1: 2: 1 (metal: acid: extractant). The temperature dependence of the extraction equilibrium constant was also examined to estimate the apparent thermodynamic functions Delta H, Delta G and Delta S for the extraction reaction. The method is free from interference of a large number of cations and anions. The method was used for the selective extraction of thallium(III) from its binary mixture with Zn(II), Cd(II), Hg(II), Bi(ill), Pb(II), Se(IV), Te(IV), Sb(III), Ga(III), In(III), AI(III), TI(I) and Fe(III). The proposed method was applied to the synthetic mixtures and alloys. It is simple, selective, rapid and eco-friendly.

}, keywords = {2-OAP, liquid-liquid extraction, succinate media, Temperature effect, thallium(III)}, issn = {0352-5139}, doi = {10.2298/JSCO804435M}, author = {Mahamuni, Sandip V. and Wadgaonkar, Prakash P. and Anuse, Mansing A.} } @article { ISI:000273067400009, title = {Effect of sintering temperature and thermoelectric power studies of the system MgFe2-xCrxO4}, journal = {Solid State Sciences}, volume = {11}, number = {12}, year = {2009}, month = {DEC}, pages = {2075-2079}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Mixed metal oxides showing the spinel structure exhibit interesting structural and electrical properties. Substances with specific compositions in the system MgFe2-xCrxO4 were synthesized by the simple co-precipitation method and have been investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM) to study the effect of temperature on the size of particles and grains. The infrared spectrum shows, two strong bands around 600 and 500 cm(-1). An elemental composition of one of the samples, MgFeCrO4 was found by energy dispersive X-ray spectroscopy (EDS). The thermoelectric power measurements carried out from room temperature to 500 degrees C, show both n-type and p-type behavior. (C) 2009 Elsevier Masson SAS. All rights reserved.

}, keywords = {synthesis, Temperature effect, Thermoelectric studies}, issn = {1293-2558}, doi = {10.1016/j.solidstatesciences.2009.09.005}, author = {Hankare, P. P. and Vader, V. T. and Sankpal, U. B. and Gavali, L. V. and Sasikala, R. and Mulla, Imtiaz S.} }