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Fast ac electro-osmotic micropumps with nonplanar electrodes
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Schematic diagram of fluid flow which may be generated by an ac field applied between two electrodes on an insulating substrate. Surface slip at the electrodes, and resulting fluid streamlines are represented with solid and broken lines, respectively. (a) In the planar case, symmetrically sized electrodes will produce fluid vortices only, while (b) directional pumping may be generated using asymmetrically sized and spaced electrodes. Alternatively, symmetry can be broken by using partially raised electrodes (c).

Image of FIG. 2.
FIG. 2.

(a) Detail of three dimensional electroplated steps on the interdigitated electrodes. The gold electrodes are patterned on a quartz substrate. Scale bar indicates . The comparison between (b) nonplanar and (c) planar pump geometries clarifies a pumping lane. These ACEO designs are aligned within a PDMS microfluidic channel for characterization as pictured in (d) and (e). Scale bars in (b)–(e) indicate .

Image of FIG. 3.
FIG. 3.

(Color online) Centerline fluid velocity as a function of applied voltage (peak to peak) and frequency. The solid and open symbols represent results for nonplanar and base line devices, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fast ac electro-osmotic micropumps with nonplanar electrodes