Preparation and electrorheological characteristics of uniform core/shell structural particles with different polar molecules shells
Preparation and electrorheological characteristics of uniform core/shell structural particles with different polar molecules shells
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不同极性分子壳均匀核壳结构颗粒的制备及电流变特性
DOI：
10.1016/j.colsurfa.2012.06.033
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发表时间：
2012-09-20
影响因子：
5.2
通讯作者：
Cheng, Yuchuan
中科院分区：
文献类型：
--
作者：
Wu, Jinghua;Liu, Fenghua;Cheng, Yuchuan
核壳结构介电粒子在电流变流体中有着广泛的应用。本研究分别以TiO2和羟基草酸钛（TOC）为壳，合理设计和构建了两种核/壳结构的sio2基粒子。所制得的核壳结构SiO2/TiO2和SiO2/TOC颗粒是分散良好的球形纳米颗粒，具有理想的形貌和较窄的粒径分布。在直流电场作用下，采用稳态剪切流和动态剪切流两种模式，研究并比较了两种核/壳颗粒在电绝缘油中的内电效应。结果表明，SiO2/TOC ER流体比SiO2/TiO2 ER流体具有更强的ER效应。SiO2/TOC ER流体在5 kV/mm下的静态屈服应力可达45 kPa，是SiO2/TiO2 ER流体的2倍，是SiO2 ER流体的9倍。另一方面，SiO2/TOC ER流体的零场粘度明显低于SiO2/TiO2 ER流体。因此，在相同电场下，SiO2/TOC ER流体的ER效率远高于SiO2/TiO2 ER流体。(C) 2012 Elsevier B.V.版权所有
The core/shell structural dielectric particles are applied widely in the electrorheological (ER) fluids. In this work, we rationally designed and constructed two kinds of core/shell structured SiO2-based particles with TiO2 and hydroxyl titanium oxalate (TOC) as shell, respectively. The obtained core/shell structural SiO2/TiO2 and SiO2/TOC particles were well dispersed spherical nanoparticles with ideal morphology and a narrow size distribution. Under DC electric fields, the ER effect of the two kinds of core/shell particles dispersed in electrically insulating oil was examined and compared by steady shear flow and dynamic shear modes. It was found that the SiO2/TOC ER fluid showed a stronger ER effect compared to the SiO2/TiO2 ER fluid. The static yield stress of the SiO2/TOC ER fluid was up to 45 kPa at 5 kV/mm, which was twice of the SiO2/TiO2 ER fluid and 9 times of the SiO2 ER fluid. On the other hand, the zero field viscosity of the SiO2/TOC ER fluid was obviously lower than that of the SiO2/TiO2 ER fluid. Therefore, the ER efficiency of the SiO2/TOC ER fluid was much higher than that of SiO2/TiO2 ER fluid at the same electric field. (C) 2012 Elsevier B.V. All rights reserved.