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

Jinghua Wu; Gaojie Xu; Yuchuan Cheng; Fenghua Liu; Jianjun Guo; Ping Cui

doi:10.1016/j.jcis.2012.04.044

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

J Colloid Interface Sci. 2012 Jul 15;378(1):36-43. doi: 10.1016/j.jcis.2012.04.044. Epub 2012 Apr 25.

Authors

Jinghua Wu¹, Gaojie Xu, Yuchuan Cheng, Fenghua Liu, Jianjun Guo, Ping Cui

Affiliation

¹ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China.

PMID: 22579514
DOI: 10.1016/j.jcis.2012.04.044

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.