Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 571, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physa.2021.125823
Keywords
Wetting; Cassie-Baxter; Wenzel; Contact angles; Multi-scale substrate; Surface roughness
Categories
Funding
- European Space Agency (ESA) [AO-2004-096]
- Belgian Federal Science Policy (BELSPO)
- FNRS, Belgium
- Region Wallonne, Belgium
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The analytical expressions of liquid-vapor equilibrium contact angles are studied for various simple geometries and arrangements of the substrate, showing the relevance of intermediate wetting states in competition with the Wenzel and Cassie-Baxter states.
The analytical expressions of liquid-vapor equilibrium contact angles are analyzed in the thermodynamic limit for various simple geometries and arrangements of the substrate, in particular when the latter exhibits two or more scales. It concerns the Wenzel state of wetting when the substrate is completely wet, the Cassie-Baxter state when the liquid hangs over the substrate, but also intermediate states of wetting which are shown to be relevant and in competition with the two other ones. Under a separation of scales hypothesis, a composition rule of contact angles is developed whose interest is illustrated in a close packing setup of raspberry-like particles. (C) 2021 Elsevier B.V. All rights reserved.
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