Keywords

electrowetting, contact angle, young lippman, passivation, asymmetry

Abstract

In electrowetting, a droplet/substrate contact angle is modulated by applying a potential difference between the droplet and the substrate. Typically, the droplet potential is changed via an auxiliary electrode dipped in the droplet. Here, it is shown that electrochemical reactions lead to a potential drop on the auxiliary electrode in electrowetting, which degrades the droplet contact angle modulation. The magnitude of this effect depends on the voltage polarity. This problem can be addressed by using a dielectric layer, such as SiO2, which can prevent electrochemical reactions with the electrowetting substrate and the auxiliary electrode.

Original Publication Citation

M. Khodayari, N. B. Crane, A. A. Volinsky, Electrochemical Explanation for Asymmetric Electrowetting Response, Thin Solid Films Vol 548 (2013), pp. 632-635 DOI: 10.1016/j.tsf.2013.10.011.

Document Type

Peer-Reviewed Article

Publication Date

2013

Publisher

Thin Solid Films

Language

English

College

Ira A. Fulton College of Engineering and Technology

Department

Mechanical Engineering

University Standing at Time of Publication

Full Professor

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