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Nonequilibrium Gibbs' criterion for completely wetting volatile liquids
Yannis Tsoumpas1, Sam Dehaeck, Mariano Galvagno
1TIPs (Transfers, Interfaces and Processes), Université Libre de Bruxelles , CP 165/67, Av. F.D. Roosevelt 50, 1050 Brussels, Belgium.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 16, 2014
Summary
For volatile liquids spreading on solids, a liquid
Area of Science:
- Surface science and fluid dynamics
- Interfacial phenomena and phase transitions
Background:
- Liquid spreading on solid substrates is governed by contact line dynamics.
- The Gibbs' criterion describes equilibrium contact angle for pinned contact lines at sharp edges.
Purpose of the Study:
- To investigate the effect of evaporation on the critical angle for contact line depinning.
- To identify dynamic contributions to the critical angle beyond equilibrium conditions.
Main Methods:
- Experimental observation of liquid spreading and contact line behavior.
- Theoretical modeling to analyze the underlying physical mechanisms.
Main Results:
- A dynamically-produced contribution to the critical depinning angle was identified for volatile liquids.
- This dynamic contribution increases with increasing evaporation rate.
- The findings are consistent for both experimental and theoretical approaches.
Conclusions:
- Evaporation introduces a non-equilibrium effect that modifies the critical angle for contact line depinning.
- A modified Gibbs' criterion can account for these dynamic, evaporation-driven effects.
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