Colloidal particle electrorotation in a nonuniform electric field

被引：10
|
作者：
Hu, Yi [1 ]
Vlahovska, Petia M. [1 ]
Miksis, Michael J. [1 ]
机构：
[1] Northwestern Univ, Engn Sci & Appl Math, Evanston, IL 60208 USA
来源：
PHYSICAL REVIEW E | 2018年 / 97卷 / 01期
基金：
美国国家科学基金会;
关键词：
MICRO-ROTORS; ROTATION; SPHERES; POPULATIONS; SUSPENSIONS; VISCOSITY; EMERGENCE; DYNAMICS;
D O I：
10.1103/PhysRevE.97.013111
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
A model to study the dynamics of colloidal particles in nonuniform electric fields is proposed. For an isolated sphere, the conditions and threshold for sustained (Quincke) rotation in a linear direct current (dc) field are determined. Particle dynamics becomes more complex with increasing electric field strength, changing from steady spinning around the particle center to time-dependent orbiting motion around the minimum field location. Pairs of particles exhibit intricate trajectories, which are a combination of translation, due to dielectrophoresis, and rotation, due to the Quincke effect. Our model provides a basis to study the collective dynamics of many particles in a general electric field.
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收藏
页数：14
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