表面活性剂对纳米CeO_2在水介质中分散性能的影响

Effect of Surfactants on Dispersing Properties in Water Suspension for CeO_2 Nanopowders

在对纳米CeO2粉体的Zeta电位进行测量的基础上,采用阴离子表面活性剂油酸和非离子型表面活性剂聚乙烯吡咯烷酮(PVP)对纳米CeO2粉体进行了分散实验,系统研究了超声分散时间、表面活性剂种类和浓度对纳米CeO2粉体在水相介质中分散稳定性能的影响。结果表明:随超声时间的延长,纳米CeO2粉体的分散稳定性出现先增后降的变化规律;分散剂种类和浓度不同,纳米CeO2的紫外吸收效果和可见光透光性也不同;对于每一种分散剂均存在最佳超声时间和最佳浓度。纳米CeO2粉体在水相介质中的最佳分散工艺为:超声时间10 min,浓度(质量分数)为2.0%的PVP。

On the basis of measurement of Zeta potential of CeO2 nano-powders, the influences of supersonic time and surfactant concentration on the stability of CeO2 suspension is systematically studied by using surfactants,such as oleic acid and polyvinylpyrrolidone（PVP）.Results show that the dispersion stability of CeO2 water suspension firstly increases to a maximum and then decreases as ultrasonic time extending.UV absorbance and visible light transparency are influenced by the kind and the concentration of the surfactants.PVP is the better dispersant agent of the two kinds of surfactants used in the experiments.The optimal dispersing condition is 2.0wt% of PVP and an ultrasonic time of 10 min.