Electrorheological behavior of urea-doped mesoporous TiO2 suspensions

被引：24

作者：

Di, Kai ^{[1
]}

Zhu, Yihua ^{[1
]}

Yang, Xiaoling ^{[1
]}

Li, Chunzhong ^{[1
]}

机构：

[1] E China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2006年 / 280卷 / 1-3期

基金：

中国国家自然科学基金;

关键词：

electrorheological; dielectric properties; mesoporous TiO2; urea-doped; interfacial particle polarization;

D O I：

10.1016/j.colsurfa.2006.01.032

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A type of anhydrous electrorheological (ER) material of urea-doped mesoporous TiO2 is synthesized by in micelle-assisted incorporation urea molecules during mesoporous TiO2 synthesis. TEM, XRD demonstrate that the material had mesoporous structure, while the FT-IR spectra and the nitrogen adsorption-desorption isotherms show urea molecules have been fixed in the channel of the mesoporous TiO2. The ER behavior of the suspensions of urea-doped mesoporous TiO2 in silicone oil with the different volume fractions was investigated under an applied electric field. It is found that the suspensions show visible electrorheological behavior which are compared with that of pure TiO2. The dopants of urea molecules change the conductivity of the particles, and produce a proper conductivity of similar to 10(-7) S m(-1) With the molar ratio of urea/Ti = 0.2. Dielectric spectra of the ER fluid was measured to examine the peak of epsilon" should appear in the frequency range of 10(2) - 10(5) Hz and have a large Delta epsilon' in this frequency range. The interfacial particle polarization model can exactly explain the ER behavior of this material. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：71 / 75

页数：5

共 36 条

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