Capillary Pressure and Contact Line Force on a Soft Solid

Details Capillary Pressure and Contact Line Force on a Soft Solid Capillary Pressure and Contact Line Force on a Soft Solid

2012-01-20

arxiv.org/abs/1201.4268v1

Physics

Fluid Dynamics

Scientific paper

The surface free energy, or surface tension, of a liquid interface gives rise to a pressure jump when the interface is curved. Here we show that a similar capillary pressure arises at the interface of soft solids. We present experimental evidence that immersion of a thin elastomeric wire into a liquid induces a substantial elastic compression due to the solid capillary pressure at the bottom. We quantitatively determine the effective surface tension from the elastic displacement field, and find a value comparable to the liquid-vapor surface tension. Most importantly, these results also reveal the way the liquid pulls on the solid close to the contact line: the capillary force is not oriented along the liquid-air interface, nor perpendicularly to the solid surface, as previously hypothesized, but towards the interior of the liquid.

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