中国物理B ›› 2006, Vol. 15 ›› Issue (11): 2476-2480.doi: 10.1088/1009-1963/15/11/002

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Polar molecule dominated electrorheological effect

陆坤权1, 沈容1, 王学昭1, 孙刚1, 温维佳2, 刘寄星3   

  1. (1)Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100080, China; (2)Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100080, China；Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China; (3)Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100080, China；Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2006-08-21 出版日期:2006-11-20 发布日期:2006-11-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No 2004CB619005), the Knowledge Innovation Project and Outstanding Overseas Chinese Scholars Fund of Chinese Academy of Sciences and NSFC.

Polar molecule dominated electrorheological effect

Lu Kun-Quan(陆坤权)a)†, Shen Rong(沈容)a), Wang Xue-Zhao(王学昭)a), Sun Gang(孙刚)a), Wen Wei-Jia(温维佳)a)b), and Liu Ji-Xing(刘寄星)a)c)   

  1. a Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; b Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China; c Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2006-08-21 Online:2006-11-20 Published:2006-11-20
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No 2004CB619005), the Knowledge Innovation Project and Outstanding Overseas Chinese Scholars Fund of Chinese Academy of Sciences and NSFC.

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摘要： The yield stress of our newly developed electrorheological (ER) fluids consisting of dielectric nano-particles suspended in silicone oil reaches hundreds of kPa, which is orders of magnitude higher than that of conventional ones. We found that the polar molecules adsorbed on the particles play a decisive role in such new ER fluids. To explain this polar molecule dominated ER (PM-ER) effect a model is proposed based on the interaction of polar molecule-charge between the particles, where the local electric field is significantly enhanced and results in the polar molecules aligning in the direction of the electric field. The model can well explain the giant ER effect and a near-linear dependence of the yield stress on the electric field. The main effective factors for achieving high-performance PM-ER fluids are discussed. The PM-ER fluids with the yield stress higher than one MPa can be expected.

关键词: electrorheological fluid, polar molecule, polarization, shear stress

Abstract: The yield stress of our newly developed electrorheological (ER) fluids consisting of dielectric nano-particles suspended in silicone oil reaches hundreds of kPa, which is orders of magnitude higher than that of conventional ones. We found that the polar molecules adsorbed on the particles play a decisive role in such new ER fluids. To explain this polar molecule dominated ER (PM-ER) effect a model is proposed based on the interaction of polar molecule-charge between the particles, where the local electric field is significantly enhanced and results in the polar molecules aligning in the direction of the electric field. The model can well explain the giant ER effect and a near-linear dependence of the yield stress on the electric field. The main effective factors for achieving high-performance PM-ER fluids are discussed. The PM-ER fluids with the yield stress higher than one MPa can be expected.

Key words: electrorheological fluid, polar molecule, polarization, shear stress

中图分类号:  (Electro- and magnetorheological fluids)

  • 83.80.Gv
77.22.Ej (Polarization and depolarization) 83.60.La (Viscoplasticity; yield stress) 83.60.Np (Effects of electric and magnetic fields)