Reversed flow at low frequencies in a microfabricated AC electrokinetic pump

Details Reversed flow at low frequencies in a microfabricated AC electrokinetic pump Reversed flow at low frequencies in a microfabricated AC electrokinetic pump

2007-04-10

arxiv.org/abs/0704.1321v1

PHYSICAL REVIEW E 76, 056305 (2007)

Physics

Fluid Dynamics

RevTex, 9 pages, 6 eps figures

Scientific paper

10.1103/PhysRevE.76.056305

Microfluidic chips have been fabricated to study electrokinetic pumping generated by a low voltage AC signal applied to an asymmetric electrode array. A measurement procedure has been established and followed carefully resulting in a high degree of reproducibility of the measurements. Depending on the ionic concentration as well as the amplitude of the applied voltage, the observed direction of the DC flow component is either forward or reverse. The impedance spectrum has been thoroughly measured and analyzed in terms of an equivalent circuit diagram. Our observations agree qualitatively, but not quantitatively, with theoretical models published in the literature.

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