Journal
ELECTROPHORESIS
Volume 30, Issue 15, Pages 2668-2675Publisher
WILEY
DOI: 10.1002/elps.200900017
Keywords
DC-biased AC electric field; Dielectrophoresis; Electrokinetic flow; Microchannel constriction; Particle focusing
Funding
- Clemson University
- Research Equipment Fund
- State Key Laboratory of Nonlinear Mechanics in China
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This paper presents a fundamental study of particle electrokinetic focusing in a single microchannel constriction. Through both experiments and simulations, we demonstrate that such dielectrophoresis-induced particle focusing can be implemented in a much smaller magnitude of DC-biased AC electric fields (10 kV/m in total) as compared to pure DC electric fields (up to 100 kV/m). This is attributed to the increase in the ratio of cross-stream particle dielectrophoretic velocity to streamwise electrokinetic velocity as only the DC field component contributes to the latter. The effects of the 1 kHz frequency AC to DC electric field ratio on particle trajectories and velocity variations through the microchannel constriction are also examined, which are found to agree with the simulation results.
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