蒙脱土/二氧化钛复合颗粒电流变液材料的制备及其性能

Preparation and Electrorheological Properties of Montmorillonite/Titania Composite

利用溶胶 -凝胶法制备了一种新型的蒙脱土 /二氧化钛 (MMT/TiO2 )复合电流变颗粒材料 ,FT IR ,XRD ,SEM分析表明TiO2 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/TiO2 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 2 5 %,直流电场强度为 3kV/mm时 ,TiO2 质量分数为 2 2 7%的MMT/TiO2 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TiO2

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% TiO2 ER fluid ( phi = 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.