【摘要】 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 包覆量对电流变效应有重要影响更多还原

【Abstract】 A new kind of montmorillonite/titania (MMT/TiO 2) 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/TiO 2 composites are used as ER fluid by dispersing them in silicone oil. It is found that the MMT/TiO 2 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%TiO 2 ER fluid ( φ =25%) is about 8 3 kPa, which is 4 times of that of pure MMT ER fluid. Furthermore, it is demonstrated that the TiO 2 coating content has an important influence on the ER effect.更多还原