Synthesis of platinum colloids sterically stabilized by poly(N-vinylformamide) or poly(N-vinylalkylamide) and their stability towards salt

被引：38

作者：

Chen, CW ^{[1
]}

Tano, D ^{[1
]}

Akashi, M ^{[1
]}

机构：

[1] Kagoshima Univ, Fac Engn, Dept Chem Engn & Appl Chem, Kagoshima 8900065, Japan

来源：

COLLOID AND POLYMER SCIENCE | 1999年 / 277卷 / 05期

关键词：

poly(N-vinylformamide); poly(N-vinylalkylamide); dispersion stability; colloidal platinum nanoparticles; critical flocculation concentration;

D O I：

10.1007/s003960050414

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Colloidal dispersions of nanometer-sized platinum colloids were prepared by ethanol reduction of PtCl62- in the presence of poly(N-vinylformamide) (PNVF), poly(N-vinylacetamide) (PNVA) or poly(N-vinylisobutyramide) (PNVI-BA) 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.

引用

页码：488 / 493

页数：6

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