Synthesis of platinum colloids sterically stabilized by poly(N-vinylformamide) or poly(N-vinylalkylamide) and their stability towards salt |
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Authors: | C-W Chen D Tano M Akashi |
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Institution: | (1) Department of Applied Chemistry and Chemical Engineering Faculty of Engineering Kagoshima University 1-21-40 Korimoto Kagoshima 890-0065 Japan, JP |
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Abstract: | Colloidal dispersions of nanometer-sized platinum colloids were prepared by ethanol reduction of PtCl6
2− in the presence of poly(N-vinylformamide) (PNVF), poly(N-vinylacetamide) (PNVA) or poly(N-vinylisobutyramide) (PNVIBA) and analyzed by UV-vis spectroscopy and transmission electron microscopy. The dispersion stability
of each colloid to the presence of added KCl was determined by a stirring and centrifugation procedure. The platinum colloid
stabilized by PNVF (PNVF-Pt) was the most stable and its critical flocculation concentration was not observed up to the highest
electrolyte concentration employed (4.0 M). The stability of the platinum colloids stabilized by poly(N-isopropylacrylamide) (PNIPAAm) and poly(vinylpyrrolidone) (PVP) was also examined. The sequence of polymer-stabilized platinum
colloids in increasing order of dispersion stability was found to be PNIPAAm-Pt < PNVIBA-Pt < PVP-Pt < PNVA-Pt < PNVF-Pt.
Received: 25 August 1998 Accepted in revised form: 14 January 1999 |
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Keywords: | Poly(N-vinylformamide) Poly(N-vinylalkylamide) Dispersion stability Colloidal platinum nanoparticles Critical flocculation concentration |
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