Comparison of spherical and non-spherical particles in microchannels under dielectrophoretic force

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• 作者：Minghao Song (1)
  Yu Lei (2)
  Hongwei Sun (1)
  
  1. Department of Mechanical Engineering ; University of Massachusetts Lowell ; Lowell ; MA ; 01854 ; USA
  2. Department of Chemical and Biomolecular Engineering ; University of Connecticut ; 191 Auditorium Road ; Storrs ; CT ; 06269 ; USA
  
• 刊名：Microsystem Technologies
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：21
• 期：2
• 页码：381-391
• 全文大小：1,847 KB
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• 刊物类别：Engineering
• 刊物主题：Electronics, Microelectronics and Instrumentation
  Nanotechnology
  Mechanical Engineering
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1858

文摘

This paper focuses on the computational and experimental study of dielectrophoretic (DEP) force based manipulation of spherical and non-spherical particles by taking into consideration of both electrokinetic effects and particle hydrodynamics. The model is first validated with conventional dipole moment theory. The movements of a spherical polystyrene particle and a rod-shape particle under a non-uniform electric field created by a pair of non-symmetrical electrodes in a microfluidic channel are studied, and a good agreement between the simulation and experimental results is obtained. Both experimental and simulation results reveal that the rod-shape particle experiences larger DEP force and moves faster than spherical particle with a similar mass. It was also interestingly found that the shape-dependent DEP force distribution on the microscale rod particle results in its unique behavior, which cannot be captured by traditional DEP theory.