关键词: 纳米二氧化铈 , 表面改性 , 硬脂酸 , 亲油化度

Abstract: 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 1.5 h. 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.

Key words: Nano cerium dioxide, Surface modification, Stearic acid, Lipophilic degree