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Vibration-induced Wenzel-Cassie wetting transition on microstructured hydrophobic surfaces

Authors :
Tai-Min Cai
Ji-Chang He
Wei Lei
Zhi-hai Jia
Gang Wang
Source :
Applied Physics Letters. 104:181601
Publication Year :
2014
Publisher :
AIP Publishing, 2014.

Abstract

Wetting transitions were studied with vertically vibrated droplet on various polydimethylsiloxane surfaces with square array of pillars. Our experiments show that the increase of the pillar spacing, at each given frequency, leads to a decrease of the critical amplitude (which is required to achieve a Wenzel to Cassie transition). The physical mechanism of Wenzel-Cassie transition by vibration is presented. Compared with other studies of wetting transition by vibration, we demonstrate that Wenzel-Cassie transition comes up when R(θ)fn2Acr2≈const (where fn is the resonance frequency, Acr is the threshold amplitude, and R(θ) is the initial radius of the droplet).

Details

ISSN :
10773118 and 00036951
Volume :
104
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........692996485356bb965d8088ff41e4f06a
Full Text :
https://doi.org/10.1063/1.4875586