Improvement of microchannel geometry subject to electrokinesis and dielectrophoresis using numerical simulations
- Authors
- Kwon, Jae-Sung; Maeng, Joo-Sung; Chun, Myung-Suk; Song, Simon
- Issue Date
- 2008-07
- Publisher
- SPRINGER HEIDELBERG
- Citation
- MICROFLUIDICS AND NANOFLUIDICS, v.5, no.1, pp.23 - 31
- Abstract
- This paper addresses the effects of microchannel geometry with electrically insulating posts on a particle flow driven by electrokinesis and dielectrophoresis. An in-house numerical program is developed using a numerical model proposed in literature to predict particle flows in a microchannel with a circular post array. The numerical program is validated by comparing the results of the present study to those in the literature. Results obtained from a Monte-Carlo simulation confirm the three particle flow types driven by an external DC electric field: electrokinetic flow, streaming dielectrophoretic flow, and trapping dielectrophoretic flow. In addition, we study the effects of electrokinetic and dielectrophoretic forces on particle transports by introducing a ratio of lateral to longitudinal forces exerted on a particle. As a result, we propose an improved microchannel geometry to enhance particle transports across electrokinetic streamlines for a given power dissipation. The improved microchannel has a shorter longitudinal spacing between the circular posts than a reference microchannel. We also discuss the critical values of dimensionless variables that distinguish the three particle flow types for both improved and reference microchannels.
- Keywords
- TOTAL ANALYSIS SYSTEMS; ARRAY ELECTROPHORESIS CHIPS; CAPILLARY-ELECTROPHORESIS; ELECTROOSMOTIC FLOW; SEPARATION; TECHNOLOGY; PARTICLES; BACTERIA; LIVE; TOTAL ANALYSIS SYSTEMS; ARRAY ELECTROPHORESIS CHIPS; CAPILLARY-ELECTROPHORESIS; ELECTROOSMOTIC FLOW; SEPARATION; TECHNOLOGY; PARTICLES; BACTERIA; LIVE; electrokinesis; dielectrophoresis; DC electric field; insulating post
- ISSN
- 1613-4982
- URI
- https://pubs.kist.re.kr/handle/201004/133348
- DOI
- 10.1007/s10404-007-0210-3
- Appears in Collections:
- KIST Article > 2008
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