![]() We compare some standard models of liquid-like (Gibbs) and solid-like (Hookean and neo-Hookean elasticity) elastic interfaces which may be used to describe the pressure–deformation relations when the presence of the capillary can be considered negligible. We consider a model interface in which stresses arising from a constant interfacial tension are superimposed with mechanical extra-stresses arising from the deformation of a solid-like, incompressible interfacial layer of finite thickness described by a neo-Hookean material law. Here we show that simple analytical relationships can be derived to describe reliably the pressure–deformation relations of nearly spherical elasto-capillary droplets (“droploons”) attached to a capillary. Pendant drop techniques are convenient, but suffer from complex shape changes and associated fitting procedures with multiple parameters. Despite growing efforts, simple and reliable experimental characterisation of these interfaces remains a challenge, especially of their dilational properties. An increasing number of multi-phase systems exploit complex interfaces in which capillary stresses are coupled with solid-like elastic stresses. ![]()
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