中国物理B ›› 2018, Vol. 27 ›› Issue (6): 68301-068301.doi: 10.1088/1674-1056/27/6/068301

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Electrical field-driven ripening profiles of colloidal suspensions

Zi-Rui Wang(王子瑞), Wei-Jia Wen(温维佳), Li-Yu Liu(刘雳宇)   

  1. 1 College of Physics, Chongqing University, Chongqing 401331, China;
    2 Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
  • 收稿日期:2018-02-02 修回日期:2018-03-05 出版日期:2018-06-05 发布日期:2018-06-05
  • 通讯作者: Li-Yu Liu E-mail:lyliu@cqu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos.11474345 and 11674043).

Electrical field-driven ripening profiles of colloidal suspensions

Zi-Rui Wang(王子瑞)1, Wei-Jia Wen(温维佳)2, Li-Yu Liu(刘雳宇)1   

  1. 1 College of Physics, Chongqing University, Chongqing 401331, China;
    2 Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
  • Received:2018-02-02 Revised:2018-03-05 Online:2018-06-05 Published:2018-06-05
  • Contact: Li-Yu Liu E-mail:lyliu@cqu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos.11474345 and 11674043).

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摘要：

Electrorheological (ER) fluid is a type of smart fluid whose shear yield stress relies on the external electrical field strength. The transition of ER fluid microstructure driven by the electrical field is the reason why viscosity changes. Experimentally, the transparent electrodes are used to investigate the column size distribution where an external electric field is applied to a colloidal suspension, i.e., ER fluid is increased. The coarsening profile of ER suspensions is strongly related to electrical field strength, but it is insensitive to particle size. In addition, in a low field range the shear stress corresponding to the mean column diameter is studied and they are found to satisfy a power law. However, this dependence is invalid when the field strength surpasses a threshold value.

关键词: electrorheological fluid, electrical field, coarsening structure

Abstract:

Electrorheological (ER) fluid is a type of smart fluid whose shear yield stress relies on the external electrical field strength. The transition of ER fluid microstructure driven by the electrical field is the reason why viscosity changes. Experimentally, the transparent electrodes are used to investigate the column size distribution where an external electric field is applied to a colloidal suspension, i.e., ER fluid is increased. The coarsening profile of ER suspensions is strongly related to electrical field strength, but it is insensitive to particle size. In addition, in a low field range the shear stress corresponding to the mean column diameter is studied and they are found to satisfy a power law. However, this dependence is invalid when the field strength surpasses a threshold value.

Key words: electrorheological fluid, electrical field, coarsening structure

中图分类号:  (Effects of electric and magnetic fields)

  • 83.60.Np
83.80.Gv (Electro- and magnetorheological fluids) 83.80.Hj (Suspensions, dispersions, pastes, slurries, colloids) 61.30.Gd (Orientational order of liquid crystals; electric and magnetic field effects on order)