摘 要: 为改善纳米 CeO₂ 在水介质中的稳定分散, 在分析纳米 CeO₂各种性质的基础上, 研究了介质 pH 值、无机电解质、阴离子表面活性 剂对纳米 CeO₂ 表面电性的影响, 并对分散机理进行了分析。结果表 明: 添加无机电解质可以显著降低碱性水介质中纳米 CeO₂ 的 ζ电位, 对于改善纳米 CeO₂ 在碱性区域内的稳定性有较好的效果。 

关键词: 纳米 CeO₂; 水介质; 表面电性; ζ电位

Abstract: In order to achieve a stable dispersion of nanometer ceria in water, the influences of pH value of medium, inorganic electrolyte, anion ic surfactants on the surface electrical properties of nanometer ceria were investigated after an analysis on various properties of ceria nanopowder, and the relevant dispersion mechanism was also discussed. It was shown that, when different inorganic electrolytes was added, the ζpotential of nanometer ceria would be remarkably decreased and an excellent disper sion system would be obtained in alkalescent aqueous medium. 

Keywords: nanometerceria; aqueous medium; surface electricpropertiy; ζpotential