Demonstration of Continuous Electrowetting Actuation

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Conference Proceeding

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Electrowetting is the change in apparent surface energy of a liquid in an applied electric field. It has shown great promise in diverse applications including lab-on-A-chip and electronic displays. The electrowetting response is typically considered independent of the actuation voltage polarity. This paper describes a new approach that achieves actuation in different directions for positive and negative voltage polarities using the electrochemical characteristics of aluminum electrodes. This paper presents a concept for continuous actuation of a droplet using a single electrode and DC voltage based on this effect. Initial experiments demonstrate that droplet motion is possible. Measurements of voltage drop across aluminum electrodes confirms the polarity-dependent response of the electrodes.

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Citation / Publisher Attribution

ASME 2010 International Mechanical Engineering Congress and Exposition, v. 10, p. 837-841, art. IMECE2010-40060