Volume 113, Number 6, March 2016
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||07 April 2016|
Soft wetting and the Shuttleworth effect, at the crossroads between thermodynamics and mechanics
1 Physique et Mécanique des Milieux Hétérogènes, UMR 7636 ESPCI - CNRS - Univ. Paris-Diderot - Univ. P.M. Curie - 10 rue Vauquelin, 75005 Paris, France
2 Physics of Fluids Group, Faculty of Science and Technology, University of Twente - P.O. Box 217, 7500 AE Enschede, The Netherlands
3 Department of Applied Physics, Eindhoven University of Technology - P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
Received: 14 March 2016
Accepted: 23 March 2016
Extremely compliant elastic materials, such as thin membranes or soft gels, can be deformed when wetted by a liquid drop. It is commonly assumed that the solid capillarity in “soft wetting” can be treated in the same manner as liquid surface tension. However, the physical chemistry of a solid interface is itself affected by any distortion with respect to the elastic reference state. This gives rise to phenomena that have no counterpart in liquids: the mechanical surface stress is different from the excess free energy in surface. Here we point out some striking consequences of this “Shuttleworth effect” in the context of wetting on deformable substrates, such as the appearance of elastic singularities and unconventional capillary forces. We provide a synthesis between different viewpoints on soft wetting (microscopic and macroscopic, mechanics and thermodynamics), and point out key open issues in the field.
PACS: 68.03.Cd – Surface tension and related phenomena / 68.08.Bc – Wetting
© EPLA, 2016
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