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Applied Mathematics and Mechanics

, Volume 39, Issue 3, pp 409–422 | Cite as

A new method for particle manipulation by combination of dielectrophoresis and field-modulated electroosmotic vortex

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Abstract

A field-modulated electroosmotic flow (FMEOF) in a microchannel can be obtained by applying modulating electric fields in a direction perpendicular to the channel wall. Micro-vortexes are generated around the electrodes along with an EOF due to the surface charge on the modulated wall. When polarizable particles are suspended near the electrodes, they experience dielectrophoretic forces due to a non-uniform electric field. In this paper, micro-vortexes and dielectrophoretic forces are combined to achieve separation and trap different sized particles in a continuous flow. Numerical results indicate that by adjusting the driving electric field parallel to the channel wall and the modulating electric field, the ratio of dielectrophoretic and hydrodynamic forces can be altered. One type of particles can be trapped by micro-vortexes (negative dielectrophoresis (DEP)), and the other particles are transported to the downstream so that the particles are separated. The influence of the electrode length and the channel height on the trapping rate is investigated.

Keywords

electroosmotic dielectrophoretic micro-vortex particle separation 

Chinese Library Classification

O343 

2010 Mathematics Subject Classification

74F05 

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Copyright information

© Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Chuanchuan Xie
    • 1
  • Bo Chen
    • 1
  • Bing Yan
    • 1
  • Jiankang Wu
    • 2
  1. 1.School of Civil Engineering and MechanicsHuazhong University of Science and TechnologyWuhanChina
  2. 2.Department of Mechanical and Electrical EngineeringWenhua CollegeWuhanChina

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