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23 January 2006 Multi-directional electrokinetic pumping for efficient transport and mixing in biochip applications
S. Vijendran, C. G. Smith, M. I. Mpholo
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Proceedings Volume 6112, Microfluidics, BioMEMS, and Medical Microsystems IV; 61120H (2006) https://doi.org/10.1117/12.646084
Event: MOEMS-MEMS 2006 Micro and Nanofabrication, 2006, San Jose, California, United States
Abstract
We report the control of flow direction of a dilute salt solution in a microchannel by external voltage control of an ac electrokinetic micropump. Reversal of the flow velocity is achieved when a voltage of 2.0 V is applied to the drive electrodes and we show that the reverse velocity increases non-linearly with voltage above this value. Velocities of more than 250 um/s at a distance of 75 μm above the electrode surfaces have been measured, which is much greater than in the forward direction. A possible mechanism based on faradaic charge injection is proposed to explain the onset and propagation of reverse flow. We have also shown how multi-directional flow control can be utilized to promote mixing of fluids in a microchannel, and suggest a biochip application which can benefit from this new pumping technology.
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S. Vijendran, C. G. Smith, and M. I. Mpholo "Multi-directional electrokinetic pumping for efficient transport and mixing in biochip applications", Proc. SPIE 6112, Microfluidics, BioMEMS, and Medical Microsystems IV, 61120H (23 January 2006); https://doi.org/10.1117/12.646084
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KEYWORDS
Electrodes
Microfluidics
BioMEMS
Microsystems
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