银超细粉末的制备

探讨了以葡萄糖为还原剂，聚乙烯吡咯烷酮为分散剂，在碱性条件下还原硝酸银水溶液制备银超细粉末的反应机理及工艺条件下。结果表明，在碱性葡萄糖溶液中还原硝酸银的反应，是经中间产物氧化银而转变为银的，此过程于瞬间完成。

Preparation of Ultrafine Silver Powders

This paper studied the preparation of ultrafine silver powders by reduction of silver nitrate with glucose in aqueous solution under the basicity condition,and poly(N-vinly-2-pyrrolidone) (PVP) as the dispersive polymer. Reduced in basicity glucose solution through the Ag2O intermediate product,silver nitrate changed into silver particles,this process was completed rapidly.The Ag2O intermediate products was identified by TGA,and the final product-silver powders were characterized by XRD.The range of particle size of ultrafine silver particles prepared by this method was from 100 to 250nm(average size of aggregates).The temperature, the concentration of reactants and the pH of the reaction system were the main factors effecting the particle size.