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Jumping of a droplet on a superhydrophobic surface in AC electrowetting SCIE SCOPUS

Title
Jumping of a droplet on a superhydrophobic surface in AC electrowetting
Authors
Lee, SJLee, SKang, KH
Date Issued
2011-08
Publisher
SPRINGER
Abstract
Consistent droplet bouncing driven by AC electrowetting was achieved by introducing a superhydrophobic surface instead of conventional hydrophobic surfaces. A superhydrophobic surface is very effective to reduce interfacial energy barrier or adhesion, allowing complete detachment of a droplet from the substrate. While a fixed electric potential (100 V(rms)) was applied, the shape deformation and the droplet bouncing were significantly influenced by the frequency of the AC electrowetting. Consistent droplet bouncing only occurred at very narrow frequency ranges (e.g., 30-31 Hz for 8 mu L droplets), indicating that resonance dominates the droplet bouncing. Interestingly, the resonance was 1/2 sub-harmonics, where every other actuation was skipped, when the droplet was in the air. Theoretical evaluation of the resonant frequency based on the linear theory implies that the fundamental resonance between the AC electrowetting and the vertical vibration of the shape oscillation could be important to produce consistent droplet bouncing.
Keywords
Electrowetting; Droplet jumping; Oscillation; Superhydrophobic surface; LIQUID DROPLETS; ACTUATION
URI
https://oasis.postech.ac.kr/handle/2014.oak/17123
DOI
10.1007/S12650-011-0076-Z
ISSN
1343-8875
Article Type
Article
Citation
JOURNAL OF VISUALIZATION, vol. 14, no. 3, page. 259 - 264, 2011-08
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강관형KANG, KWAN HYOUNG
Dept of Mechanical Enginrg
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