蒙脱土/二氧化钛复合颗粒电流变液材料的制备及其性能

利用溶胶-凝胶法制备了一种新型的蒙脱土/二氧化钛(MMT/TiO_2)复合电流变 颗粒材料，FT-IR，XRD，SEM分析表明TiO_2以纳米晶的形态包覆于蒙脱土表面。电 流变性能测试表明，MMT/TiO_2复合颗粒的电流变效应比纯蒙脱土电流变液有显著 提高，当颗粒体积分数为25%，直流电场强度为3kV/mm时，TiO_2质量分数为22.7% 的MMT/TiO_2复合颗粒电流变液的静态屈服应力达8.3kPa，此值约为纯蒙脱土电流 变液的4倍。同时发现TiO_2包覆量对电流变效应有重要影响。

Preparation and Electrorheological Properties of Montmorillonite/Titania Composite

A new kind of montmorillonite/titania (MMT/TiO2) composite particles is synthesized by means of sol-gel technique for use in electrorheological (ER) active materials. FT-IR, XRD and SEM measurements show that titania is deposited on the surface of montmorillonite particles as anatase nanocrystallites. The MMT/TiO2 composites are used as ER fluid by dispersing them in silicone oil. It is found that the MMT/TiO2 ER fluid has a notable ER effect under DC electric field. When 3 kV/mm electric field is applied, the static yield stress of typical MMT/22.7 wt%Ti02 ER fluid (cp = 25%) is about 8.3 kPa, which is 4 times of that of pure MMT ER fluid. Furthermore, it is demonstrated that the TiO2 coating content has an important influence on the ER effect.