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

Journal of Colloid and Interface Science
Jinghua WuPing Cui

Abstract

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 SiO(2) and TiO(2) as core, respectively. The obtained core-shell structural SiO(2)-TOC and TiO(2)-TOC particles were well-dispersed spherical nanoparticles with ideal morphology and a narrow size distribution. Under DC electric fields, the TiO(2)-TOC ER fluid showed notable ER activity with a yield stress of about 96 kPa (at 4 kV/mm), which is 3 times of that SiO(2)-TOC ER fluid and outclassed the yield stress of the TOC ER fluid. The dielectric spectra indicated that the higher dielectric constant of TiO(2) core induces the stronger interaction between the neighboring particles, which contribute to the enhancement of ER activity.

References

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Mar 5, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Min S ChoWha-Seung Ahn
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Citations

Mar 8, 2016·Journal of Colloid and Interface Science·Jungchul NohJyongsik Jang
Sep 3, 2013·Journal of Colloid and Interface Science·Ke ZhangHyoung Jin Choi
Jan 26, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Matthias F GeistDirk G Kurth
Oct 23, 2015·ACS Applied Materials & Interfaces·Chenguang NiuMin Qi
Dec 18, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Jayabrata DharSuman Chakraborty
Feb 2, 2018·ACS Applied Materials & Interfaces·Jinghua WuGaojie Xu

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