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arXiv · 1104.1741

The Deformation of an Elastic Substrate by a Three-Phase Contact Line

Elizabeth R. Jerison·Ye Xu·Larry A. Wilen·Eric R. Dufresne
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Abstract

Young's classic analysis of the equilibrium of a three-phase contact line ignores the out-of-plane component of the liquid-vapor surface tension. While it has long been appreciated that this unresolved force must be balanced by elastic deformation of the solid substrate, a definitive analysis has remained elusive because conventional idealizations of the substrate imply a divergence of stress at the contact line. While a number of theories of have been presented to cut off the divergence, none of them have provided reasonable agreement with experimental data. We measure surface and bulk deformation of a thin elastic film near a three-phase contact line using fluorescence confocal microscopy. The out-of-plane deformation is well fit by a linear elastic theory incorporating an out-of-plane restoring force due to the surface tension of the gel. This theory predicts that the deformation profile near the contact line is scale-free and independent of the substrate elastic modulus.

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Elizabeth R. Jerison, Ye Xu, Larry A. Wilen, Eric R. Dufresne. 2011-04-10. The Deformation of an Elastic Substrate by a Three-Phase Contact Line. https://doi.org/10.1103/physrevlett.106.186103

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