Acta Chimica Sinica ›› 1996, Vol. 54 ›› Issue (4): 379-384. Previous Articles     Next Articles

Original Articles

化学还原法制备纳米级Ag粉高分子保护机理研究

张宗涛;赵斌;胡黎明;石庆红;袁留锁   

  1. 华东理工大学国家超细粉末工程研究中心
  • 出版日期:1996-04-15 发布日期:1996-04-15

Polymer protective mechanism of nanometer silver powder prepared by chemical reduction method

ZHANG ZONGTAO;ZHAO BIN;HU LIMING;SHI QINGHONG;YUAN LIUSUO   

  • Online:1996-04-15 Published:1996-04-15

Nanometer silver grain growth and particle's aggregation were effectively prohibited by polyvinyl pirrolidon (PVP) when the silver powder prepared from silver nitride solution reduced by hydrazine hydrate. On the base of ultraviolet spectra and FTIR spectra measurement, PVP protecting mechanisms proposed in this paper were that, first, the coordinative bonds were formed between PVP and silver ions; secondly, a large number of silver embryos were generated during the initial reaction period due to the coordinative bonds formation; and finally, silver embryos and the PVP steric effects were responsible for the inhibited grain growth and the grain aggregation of silver particles.

Key words: ULTRAVIOLET SPECTROPHOTOMETRY, SILVER, INFRARED SPECTROPHOTOMETRY, REDUCTION, POLYVINYLPYRROLIDONE, NANOPHASE MATERIALS

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