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Electrowetting-Induced Droplet Detachment from Hydrophobic Surfaces SCIE SCOPUS

Title
Electrowetting-Induced Droplet Detachment from Hydrophobic Surfaces
Authors
Lee, SJHong, JKang, KHKANG, IN SEOKLee, SJ
Date Issued
2014-02-25
Publisher
AMER CHEMICAL SOC
Abstract
Detachment of droplets from solid surfaces is a basic and crucial process in practical applications such as heat transfer and digital microfluidics. In this study, electrowetting actuations with square pulse signals are employed to detach droplets from a hydrophobic surface. The threshold voltage for droplet detachment is obtained both experimentally and theoretically to find that it is almost constant for various droplet volumes ranging from 0.4 to 10 mu L. It is also found that droplets can be detached more easily when the width of applied pulse is well-matched to the spreading time (i.e., the time to reach the maximum spread diameter). When the droplet is actuated by a double square pulse, the threshold voltage is reduced by similar to 20% from that for a single square pulse actuation. Finally, by introducing an interdigitated electrode system, it is demonstrated that droplets can be detached from the solid bottom surface without using a top needle electrode.
URI
https://oasis.postech.ac.kr/handle/2014.oak/14211
DOI
10.1021/LA404344Y
ISSN
0743-7463
Article Type
Article
Citation
LANGMUIR, vol. 30, no. 7, page. 1805 - 1811, 2014-02-25
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이상준LEE, SANG JOON
Dept of Mechanical Enginrg
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