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Nonequilibrium Gibbs' Criterion for Completely Wetting Volatile Liquids.

par Tsoumpas, Ioannis ;Dehaeck, Sam ;Galvagno, Mariano;Rednikov, Alexei ;Ottevaere, Heidi;Thiele, Uwe;Colinet, Pierre
Référence Langmuir, 30, page (11847−11852)
Publication Publié, 2014-09-15

Article révisé par les pairs

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Résumé :

During the spreading of a liquid over a solid substrate, the contact line can stay pinned at sharp edges until the contact angle exceeds a critical value. At (or sufficiently near) equilibrium, this is known as Gibbs' criterion. Here, we show both experimentally and theoretically that, for completely wetting volatile liquids, there also exists a dynamically-produced contribution to the critical angle for depinning, which increases with the evaporation rate. This suggests that one may introduce a simple modification of the Gibbs' criterion for (de)pinning that accounts for the nonequilibrium effect of evaporation.