Journal
LANGMUIR
Volume 30, Issue 40, Pages 11847-11852Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la502708f
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Funding
- FP7 Marie Curie MULTIFLOW Network [PITNGA-2008-214919]
- ESA/BELSPO-PRODEX
- BELSPO-muMAST [IAP 7/38]
- FRS-FNRS
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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.
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