期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 256, 期 2-3, 页码 165-170出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2004.07.022
关键词
gamma-irradiation; precious metallic colloids; silver colloids; gold colloids; palladium colloids; platinum colloids; precious nanopowders; hydrogenation catalyst
Polymer (polyvinylpyrrodione, PVP)-protected Ag, Au, Pd, and Pt colloids were prepared in water and organic solvents (acetone/2-propanol = 1/1, vol.%) by gamma-irradiation. UV-visible spectrum of the colloidal solution shows the characteristic bands of surface resonance and gives evidence for the formation of nanoparticles. Nanopowders of precious metals (Ag, Au, Pd, and Pt) were obtained by self-assembling the thiol group of mercaptosuccinic acid (MSA) with the surface of the metal particles. Transmission electron microscopy and X-ray diffraction were used for characterizing the nanopowders. Results from high-performance liquid chromatography (HPLC) give evidence that Pd and Ag colloids in aqueous solution and organic solvents can be effectively used for the hydrogenation of cis,cis-1,3-cyclooctadiene (COD). (c) 2004 Elsevier B.V. All rights reserved.
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