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- W2053503346 abstract "A droplet deposited or impacting on a superhydrophobic surface rolls off easily, leaving the surface dry and clean. This remarkable property is due to a surface structure that favors the entrainment of air cushions beneath the drop, leading to the so-called Cassie state. The Cassie state competes with the Wenzel (impaled) state, in which the liquid fully wets the substrate. To use superhydrophobicity, impalement of the drop into the surface structure needs to be prevented. To understand the underlying processes, we image the impalement dynamics in three dimensions by confocal microscopy. While the drop evaporates from a pillar array, its rim recedes via stepwise depinning from the edge of the pillars. Before depinning, finger-like necks form due to adhesion of the drop at the pillar’s circumference. Once the pressure becomes too high, or the drop too small, the drop slowly impales the texture. The thickness of the air cushion decreases gradually. As soon as the water–air interface touches the substrate, complete wetting proceeds within milliseconds. This visualization of the impalement dynamics will facilitate the development and characterization of superhydrophobic surfaces." @default.
- W2053503346 created "2016-06-24" @default.
- W2053503346 creator A5004552501 @default.
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- W2053503346 date "2013-02-04" @default.
- W2053503346 modified "2023-10-06" @default.
- W2053503346 title "How superhydrophobicity breaks down" @default.
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- W2053503346 doi "https://doi.org/10.1073/pnas.1218673110" @default.
- W2053503346 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3587223" @default.
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- W2053503346 hasPublicationYear "2013" @default.
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