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Proceedings Paper

Multi-directional electrokinetic pumping for efficient transport and mixing in biochip applications
Author(s): S. Vijendran; C. G. Smith; M. I. Mpholo
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Paper 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.

Paper Details

Date Published: 23 January 2006
PDF: 8 pages
Proc. SPIE 6112, Microfluidics, BioMEMS, and Medical Microsystems IV, 61120H (23 January 2006); doi: 10.1117/12.646084
Show Author Affiliations
S. Vijendran, Univ. of Cambridge (United Kingdom)
C. G. Smith, Univ. of Cambridge (United Kingdom)
M. I. Mpholo, National Univ. of Lesotho (Lesotho)

Published in SPIE Proceedings Vol. 6112:
Microfluidics, BioMEMS, and Medical Microsystems IV
Ian Papautsky; Wanjun Wang, Editor(s)

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