改性高岭土/钛氧化物复合材料的制备及其高电流变活性

采用sol-gel法和机械化学法相结合制备了改性高岭土/钛氧化物颗粒,与甲基硅油配制成电流变液。XRD、FTIR分析表明,钛氧化物以含介孔的非晶态形式包覆在经过机械化学法制备的高岭土/NaCl复合物上,形成改性高岭土/钛氧化物复合颗粒。电流变性能测试表明,当颗粒体积分数为25％,E=3 kV/mm时,复合颗粒电流变液的静态屈服应力达7 kPa,是高岭土电流变液的9倍。同时发现钛氧化物含量对电流变效应有重要影响。电流变液介电性能的变化是其流变学性能提高的起源。

Preparation of Modified Kaolinite/Titanium Oxide Coated Composite Particles and High Electrorheological Activity

Modified kaolinite/titanium oxide composite was prepared by the combination of sol-gel technique and mechanochemical method. The analysis of XRD and FT-IR shows that the surface of modified kaolinite is coated by porous titanium oxide. Furthermore the electrorheological effect is associated with the titanium oxide mass percent in the composite particle. When the content of titanium oxide in the composite is 34%, E=3kV/mm, and particle/silicone oil volume fraction is 25%, the yield stress of modified kaolinite/titanium oxide composite ERF is 7 kPa, which is 9 times of that of kaolinite ERF. The improvement of dielectric properties can well explain the increase of ER effects.