Nonequilibrium Gibbs鈥?Criterion for Completely Wetting Volatile Liquids

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• 作者：Yannis Tsoumpas ; Sam Dehaeck ; Mariano Galvagno ; Alexey Rednikov ; Heidi Ottevaere ; Uwe Thiele ; Pierre Colinet
• 刊名：Langmuir
• 出版年：2014
• 出版时间：October 14, 2014
• 年：2014
• 卷：30
• 期：40
• 页码：11847-11852
• 全文大小：365K
• ISSN：1520-5827

文摘

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鈥?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鈥?criterion for (de)pinning that accounts for the nonequilibrium effect of evaporation.