Surface elastic constants of a soft solid.
basic_science · Level V
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- Record sourced from PubMed, PMID 29383365.
- Also identified by DOI 10.1039/c7sm02431b.
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Abstract
Solid interfaces have intrinsic elasticity. However, in most experiments, this is obscured by bulk stresses. Through microscopic observations of the contact-line geometry of a partially wetting droplet on an anisotropically stretched substrate, we measure two surface-elastic constants that quantify the linear dependence of the surface stress of a soft polymer gel on its strain. With these two parameters, one can predict surface stresses for general deformations of the material in the linear-elastic limit.