4.6 Article

Ultrafast micropumping by biased alternating current electrokinetics

期刊

APPLIED PHYSICS LETTERS
卷 94, 期 6, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/1.3080681

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electrohydrodynamics; electrokinetic effects; microchannel flow; micropumps

资金

  1. U.S. National Science Foundation Career Program [ECS0448896]

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This paper reports dramatic improvements in flow rate over conventional alternating current (ac) electrokinetic micropumps by exploiting asymmetry in electric potentials over the electrodes. A micropump consisting of a planar asymmetric electrode array was tested using ac signals with and without a direct current (dc) bias. All experiments were done at 100 kHz V-ac. The pumping velocity is much faster with a dc voltage, in some cases by an order of magnitude, reaching a linear velocity of up to 2.5 mm/s with only 5.4 V-rms. The discovery presents an exciting opportunity for microfluidics. Future improvement can be anticipated with additional optimization.

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