The influence of high dielectric constant core on the activity of core-shell structure electrorheological fluid

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• 作者：Jinghua Wu ; Gaojie Xu ; ^{xugj@nimte.ac.cn} ; Yuchuan Cheng ; ^{yccheng@nimte.ac.cn} ; Fenghua Liu ; Jianjun Guo ; Ping Cui
• 关键词：Electrorheological ; Core&ndash ; shell structure ; Dielectric constant ; Polar molecules
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：15 July, 2012
• 卷：378
• 期：1
• 页码：36-43
• 文件大小：1343 K

摘要

The core-shell structural dielectric particles are applied widely in the electrorheological (ER) fluids. The properties of the dielectric core are critical factors influencing their ER activity. In this paper, we successfully synthesized two kinds of core-shell hydroxyl titanium oxalate (TOC) particles with SiO₂ and TiO₂ as core, respectively. The obtained core-shell structural SiO₂TOC and TiO₂TOC particles were well-dispersed spherical nanoparticles with ideal morphology and a narrow size distribution. Under DC electric fields, the TiO₂TOC ER fluid showed notable ER activity with a yield stress of about 96 kPa (at 4 kV/mm), which is 3 times of that SiO₂TOC ER fluid and outclassed the yield stress of the TOC ER fluid. The dielectric spectra indicated that the higher dielectric constant of TiO₂ core induces the stronger interaction between the neighboring particles, which contribute to the enhancement of ER activity.