纳米二氧化铈粉体的表面改性研究

采用湿法对纳米二氧化铈进行改性。研究了纳米CeO₂表面改性的影响因素，通过正交实验确定了最优改性剂和改性条件。改性剂硬脂酸的质量分数为6％、pH为8、改性温度为70 ℃、改性时间为1.5 h时，改性后的纳米CeO₂的亲油化度达到73.0％。结果表明，改性后的纳米二氧化铈粉体能够较好地分散于甲醇中，改性前后平均粒径大小变化不大，由TEM观察到团聚现象明显降低。

Surface Modification on Nano-Cerium Oxide Powder

The CeO2 sample was modified by the wet chemical method.The surface modification of nanometer cerium oxide power and the effect factors were studied;the optimum modifying agent and condition were found.Through orthogonal experiment,the optimum reaction conditions were obtained with:the amount of the stearic acid was 6%,pH was 8,the modified temperature was 70℃,modified time was 1.5h.Using as modifying agent in the optimum condition,the lipophiiic degree of modified nanometer CeO2 is 73.0%.Experimental results that nanometer cerium oxide powders are well dispersed after modification,the average particle size is little change before and after and agglomeration is significantly reduced.