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Abstract Precious metal particles of platinum and silver have been prepared by the reduction of metal salts dissolved in an aqueous solution of a copolymer of vinyl alcohol and N-vinylpyrrolidone with methanol. The stable platinum sols were obtained in the presence of poly(vinyl alcohol), poly(N-vinylpyrrolidone), and their copolymers, but their particle sizes hardly changed with the ratio of N-vinylpyrrolidone in the copolymer. On the other hand, colloidal stable silver sols were obtained only in the presence of a copolymer. Further, with an increase in the ratio of N-vinylpyrrolidone in the copolymer, the particle size of silver became small.
Meguro et al. (1988) studied this question.