Rigidity percolation in particle-laden foams |
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Authors: | Cohen-Addad Sylvie Krzan Marcel Höhler Reinhard Herzhaft Benjamin |
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Affiliation: | Université Paris-Est, Laboratoire de Physique des Matériaux Divisés et des Interfaces, UMR CNRS 8108, 5 Bd Descartes, 77454 Marne-la-Vallée cedex 2, France. sylvie.cohen-addad@univ-mlv.fr |
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Abstract: | We study the viscoelastic behavior of aqueous foam mixed with solid noncolloidal particles. We show that adding a tiny amount of grains can enhance the elastic and loss shear moduli by more than 1 order of magnitude. The scaling of these moduli with solid volume fraction is in qualitative agreement with that predicted by an effective-medium rigidity percolation model. We present a simple model, based on capillary attraction, to explain the particle-size dependence of the threshold. |
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