Rigidity percolation in particle-laden foams.
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.
Cohen-Addad
Sylvie
S
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
Krzan
Marcel
M
Höhler
Reinhard
R
Herzhaft
Benjamin
B