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Optical Study of Interactions of Glass Beads ER Particles
Dong Xiang, Chen Zheyi, Zhang Lifei, Xu Jun, Jiang Yonggang, Zhou Luwei
State Key Laboratory of Applied Surface Physics, Physics Department, Fudan University, Shanghai 200433
Abstract:
The amount of ER effect is determined by the difference of dielectric constants of ER particles base liquid.The intensity of ER fluids can be characterized by the interaction of two particles. A double optical tweezers system suitable to study particle interaction is used to measure the particle aggregation time, and it is found that the particle aggregation time is proportional to the square of the electric field. This is the first time to directly measure the interaction of the electric dipoles of ER particles. A method is developed to use high speed CCD in measuring diffusing-wave spectroscopy (DWS), and, for the first time, the auto-correlation functions of nonegordic system of particle structure are measured to study the ER mechanism. Structure response time and force response time are obtained for glass beads ER fluid, and the time variation of characteristic decay times of system correlation functions under different electric fields is also measured. Diffusing coefficients under different fields imply that the interaction is proportional to the square of fields.
Key words:  ER fluids, Interaction, Optical tweezers, Diffusing-wave spectroscopy
FundProject:国家自然科学基金资助项目(19834020).
用光学方法研究玻璃微珠电流变液颗粒间的相互作用
董翔, 陈哲怡, 张莉菲, 徐骏, 蒋永刚, 周鲁卫
复旦大学应用表面物理国家重点实验室及物理系上海 200433
摘要:
运用一套适合研究颗粒间相互作用的双光镊系统,通过对颗粒聚集时间的测量,得出颗粒聚集时间和电场的平方成反比.这是第一次用电流变液颗粒在动态情况下直接验证电偶极子对间的相互作用.发展了一套使用高速CCD摄像机进行扩散波谱(DWS)测量的方法,首次实时测量具有颗粒结构的非各态历经体系的自相关函数,以研究电流变液机理,得到了玻璃微珠电流变液的结构响应时间和力的响应时间;测量了不同电场下体系相关函数的特征衰减时间随时间的变化.在不同电场下测量扩散系数可以反映出相互作用力与电场的平方成正比.
关键词:  电流变液  相互作用  光镊  扩散波谱
DOI:10.1088/1674-0068/14/5/537-542
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