Abstract
A theoretical study on the electroosmotic flow through a slit microchannel containing a salt-free solution is presented for dissimilar constant surface charges. Based on the exact analytical solutions for the electric potential distribution and the transient electroosmotic flow velocity, a systematic parametric study on the characteristics of the transient electroosmotic flow is investigated. The two dominant parameters affecting the transient behavior of electroosmotic flow are found to be the ratio of surface charges and the width of slit. In addition, it is found that the electroosmotic flow always moves in the same direction, irrespective of the ratio of surface charge densities, which is different from that observed in an electrolyte solution.
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