利用W/O微乳液法,分别由水/Span80或DBS/正戊醇/环己烷形成W/O微乳液,将钛醇盐在微乳中以水核为中心水解,制得包覆表面活性剂的TiO2粒子.包覆表面活性剂可显著提高TiO2的电流变活性,且非离子型表面活性剂的效果远好于离子型表面活性剂.-种典型的颗粒/硅油体积比为31%的电流变液在3kV/mm直流电场下的剪切应力为1.4kPa,约为纯TiO2的3倍,漏电流密度小于25μA/cm2.当Span80与TiO2的质量比为7%~13%时有最佳电流变效应.包覆适量的非离子表面活性剂可明显优化电流变液的温度效应,改善颗粒的悬浮稳定性.
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