The charged Pt particles were stabled with electrostatic and steric effect of PDDA and had obvious correlation with pH value of the solution, PDDA polymerization degree and PDDA content.

• 颗粒的稳定是PDDA长链分子的位阻效应和阳离子的静电效应协同作用的结果，其稳定能力与PDDA的聚合度、PDDA的用量以及反应体系的pH值密切相关。