Volume 74, Number 3, May 2006
|Page(s)||533 - 539|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||29 March 2006|
Slow viscoelastic relaxation and aging in aqueous foam
Université de Marne-la-Vallée, Laboratoire de Physique des Matériaux Divisés et des Interfaces, UMR 8108 du CNRS - 5 Boulevard Descartes 77454 Marne-la-Vallée cedex 2, France
Accepted: 1 March 2006
Like emulsions, pastes and many other forms of soft condensed matter, aqueous foams present slow mechanical relaxations when subjected to a stress too small to induce any plastic flow. To identify the physical origin of this viscoelastic behaviour, we have simulated how dry disordered coarsening 2D foams respond to a small applied stress. We show that the mechanism of long time relaxation is driven by coarsening-induced rearrangements of small bubble clusters. These findings are in full agreement with a scaling law previously derived from experimental creep data for 3D foams. Moreover, we find that the temporal statistics of coarsening-induced bubble rearrangements are described by a Poisson process.
PACS: 83.60.Bc – Linear viscoelasticity / 83.80.Iz – Emulsions and foams / 62.20.Hg – Creep
© EDP Sciences, 2006
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