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ER suspensions of composite core-shell microspheres with improved sedimentation stability

机译：具有改善沉降稳定性的复合核-壳微球的ER悬浮液

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Electrorheological (ER) fluids are usually suspensions of solid polarizable particles in nonpolar carrier liquids. Such systems are particularly sensitive to the presence of electric fields, which transform them reversibly into solid-like bodies. Fast (within milliseconds) and fully reversible reaction of ER fluids to electric field is a subject of great interest because of many possible applications in tunable vibration dampers, clutches, valves, or brakes. A novel type of ER fluids with composite microspheres composed of polymer electrolyte shell with defined shell thickness and inorganic hollow cores has been synthesized and tested in the presence of an electric field. It has been found that suspensions with composite grains possessed more stable ER response with temperature and lower power consumption in comparison to their polymer-based counterparts. ER effect of the prepared fluids was measured and related to the applied electric field and solid phase properties. It has been also shown that suspensions of composite materials exhibited improved long-term sedimentation stability in comparison to polymer-based suspensions due to the formation of weak microstructure which suppressed the sedimentation of solid phase in off-field state.
机译：电流变（ER）流体通常是固态可极化颗粒在非极性载液中的悬浮液。这样的系统对电场的存在特别敏感，电场会将它们可逆地转换为固体。 ER流体对电场的快速（毫秒级）和完全可逆的反应是引起人们极大兴趣的主题，因为在可调减振器，离合器，阀或制动器中有许多可能的应用。合成了一种新型的具有复合微球的ER流体，该复合微球由具有确定的壳厚度的聚合物电解质壳和无机空心核组成，并在电场存在下进行了测试。已经发现，与基于聚合物的对应物相比，具有复合颗粒的悬浮物在温度下具有更稳定的ER响应，功耗更低。测量了所制备流体的ER效应，并将其与施加的电场和固相性质相关。还已经表明，与聚合物基悬浮液相比，复合材料悬浮液表现出改善的长期沉降稳定性，这是由于形成了微结构，该微结构抑制了场外状态下的固相沉降。

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