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Abstract: We investigate the transition between the Cassie-Baxter and Wenzel states ofa slowly evaporating, micron-scale drop on a superhydrophobic surface. In twodimensions analytical results show that there are two collapse mechanisms. Forlong posts the drop collapses when it is able to overcome the free energybarrier presented by the hydrophobic posts. For short posts, as the drop losesvolume, its curvature increases allowing it to touch the surface below theposts. We emphasise the importance of the contact line retreating across thesurface as the drop becomes smaller: this often preempts the collapse. In aquasi-three dimensional simulation we find similar behaviour, with theadditional feature that the drop can de-pin from all but the peripheral posts,so that its base resembles an inverted bowl.



Author: H. Kusumaatmaja, M. L. Blow, A. Dupuis, J. M. Yeomans

Source: https://arxiv.org/







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