期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 425, 期 -, 页码 51-58出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2013.02.049
关键词
Superhydrophobicity; Energy barrier; Random surface; Wenzel roughness parameter; Breakthrough pressure
资金
- Natural Sciences and Engineering Research Council of Canada [8278]
The exceptionally low adhesion of superhydrophobic surfaces is contingent on drops remaining in the Cassie (suspended) state of wetting. It is therefore important to understand the relationship between the structure of a rough surface and the energy barriers separating the Cassie and Wenzel (collapsed) states of wetting. Using a two-dimensional, free energy-based model, energy barriers are calculated for superhydrophobic surfaces composed of random, self-affine roughness. It is shown that energy barriers arise from mismatches between the local and global values of the Wenzel roughness parameter. Comparisons are made between models of vertical and lateral liquid motion, and between external disturbances of energy and of pressure. (c) 2013 Elsevier B.V. All rights reserved.
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