Reversed flow at low frequencies in a microfabricated AC electrokinetic pump
Fluid Dynamics
2009-01-20 v1
Abstract
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.
Keywords
Cite
@article{arxiv.0704.1321,
title = {Reversed flow at low frequencies in a microfabricated AC electrokinetic pump},
author = {Misha Marie Gregersen and Laurits H. Olesen and Anders Brask and Mikkel Fougt Hansen and Henrik Bruus},
journal= {arXiv preprint arXiv:0704.1321},
year = {2009}
}
Comments
RevTex, 9 pages, 6 eps figures