The collapse transition on superhydrophobic surfaces
By H. Kusumaatmaja, M. L. Blow, A. Dupuis, J. Yeomans. 2008
145 citations recorded by the source corpus.
We investigate the transition between the Cassie-Baxter and Wenzel states of a slowly evaporating, micron-scale drop on a superhydrophobic surface. In two dimensions analytical results show that there are two collapse mechanisms. For long posts the drop collapses when it is able to overcome the free-energy barrier presented by the hydrophobic posts. For short posts, as the drop loses volume, its curvature increases allowing it to touch the surface below the posts. We emphasise the importance of the contact line retreating across the surface as the drop becomes smaller: this often preempts the collapse. In a quasi–three-dimensional simulation we find similar behaviour, with the additional feature that the drop can depin from all but the peripheral posts, so that its base resembles an inverted bowl.
Subfields: Computational Mechanics, Surfaces, Coatings and Films
View Paper: https://www.semanticscholar.org/paper/bd4e72817a2cfa16ae541d2aa1e8ca56297db46f
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In Computational Mechanics
In Surfaces, Coatings and Films
Citations in the corpus
- Characterization of super liquid-repellent surfaces (2014, background): “When the capillary pressure is so high, that is exceeds the impalement pressure the drop changes from the Cassie to the Wenzel state [11,88,89,94].”