Title

Electrochemical Explanation for Asymmetric Electrowetting Response

Document Type

Article

Publication Date

2013

Keywords

asymmetry, contact angle, electrowetting, passivation, Young Lippman

Digital Object Identifier (DOI)

https://doi.org/10.1016/j.tsf.2013.10.011

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.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Thin Solid Films, v. 548, p. 632-635

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