Non linear elasticity of foam films made of SDS/dodecanol mixtures
Abstract
Foam film elasticity plays a significant role in film drainage and film stability and is thus expected to influence foam dynamical properties. It strongly depends on the foaming solution composition and differs from the interface elasticity measured in unconfined geometries. We use a deformable frame to deform an assembly of five films and we measure the tension and extension of each film. This provides a simple and accurate determination of the film elasticity, in the linear and non linear regimes, for a set of SDS/dodecanol mixture, at various concentrations. We show that the nonlinear elastic behavior is well reproduced by the Mysel's model coupled with a Langmuir coadsorption isotherm for a large range of chemical compositions.
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