Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 92, Issue 3, Pages 262-268Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-4005(03)00289-2
Keywords
plug flow; microfluidics; pumping; asymmetric electrodes; AC electroosmosis
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Arrays of asymmetric interdigitated electrodes were used to produce fluid flow of an ionic solution. The electrodes were made of transparent (transmission similar to80%) indium tin oxide (ITO) and were powered by AC voltages of less than 5 V-rms. We experimentally confirm predictions that the velocity of the fluid increases with the decreasing dimensions of the electrodes and we achieved velocities in excess of 450 mum/s at 2.2 V-rms. Plug flow for the different electrode dimensions was obtained by placing one array at the bottom of a solution and the other at the top, leaving a gap of 280 mum. The experimental observations fit well with theory. (C) 2003 Elsevier Science B.V All rights reserved.
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