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Transient Electrophoretic Motion of Charged Particles Through an L-Shaped Microchannel

[+] Author Affiliations
Ye Ai, Seungkyung Park, Ali Beskok

Old Dominion University, Norfolk, VA

Junjie Zhu, Xiangchun Xuan

Clemson University, Clemson, SC

Sang W. Joo

Yeungnam University, Gyongsan, Republic of Korea

Shizhi Qian

Old Dominion University, Norfolk, VA; Yeungnam University, Gyongsan, Republic of Korea

Paper No. IMECE2009-12891, pp. 785-789; 5 pages
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 12: Micro and Nano Systems, Parts A and B
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4385-7 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME


Direct current dielectrophoretic (DC-DEP) effects on the electrophoretic motion of charged polystyrene particles through an L-shaped microchannel were experimentally and numerically studied. In addition to the electrostatic and hydrodynamic forces, particles experience a negative DC-DEP force arising from the interaction between the dielectric particle and the induced spatially non-uniform electric field occurring around the corner of the L-shape microchannel. The latter force causes a cross-stream DEP motion so that the particle trajectory is shifted towards the outer corner of the turn. A two-dimensional (2D) Lagrangian particle tracking model taking into account the induced DC-DEP effect was used to predict the particle trajectory shift through the L-shaped channel, which achieves quantitative agreement with the experimental data.

Copyright © 2009 by ASME



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