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研究了乙二醇(EG)介质中以聚乙烯吡咯烷酮(PVP)为保护剂,以氯铂酸为催化剂以硝酸银为前驱物经化学还原制备片状银粉的过程,探索与分析影响银粉形貌的主要因素.结果表明,首先被还原出来的铂成为外来晶种,是形成片状银的关键因素.它在原位为随后还原与沉淀的银提供一个平面.PVP与银离子形成络合离子,控制游离银离子的浓度,影响银的成核与生长.同时,PVP被选择性地吸附于银的粒子表面,影响了银成核与生长,最终形成片状银粉.
The process of preparation of flake silver powder by chemical reduction using polyvinylpyrrolidone (PVP) as protective agent and silver nitrate as precursor in ethylene glycol (EG) medium was studied to explore and analyze the effect of silver powder morphology Of the main factors.The results show that the first reduction of platinum to become foreign seed is a key factor in the formation of flaky silver in situ for the subsequent reduction and precipitation of silver to provide a plane.PVP and silver ions form complex ions , Control the concentration of free silver ions, affecting the nucleation and growth of silver.At the same time, PVP is selectively adsorbed on the silver particle surface, affecting the silver nucleation and growth, and finally the formation of flaky silver powder.