Issue |
Europhys. Lett.
Volume 59, Number 5, September 2002
|
|
---|---|---|
Page(s) | 786 - 792 | |
Section | Interdisciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i2002-00195-4 | |
Published online | 01 September 2002 |
Rheology of soft glassy materials
1
Laboratoire de Physique Statistique, Ecole Normale Supérieure
24 Rue Lhomond, 75231 Paris Cedex 05, France
2
Laboratoire des Matériaux et des Structures du Génie Civil
2 Allée Kepler, 77420 Champs sur Marne, France
3
Institut Charles Sadron - 6 rue Boussingault,
67083 Strasbourg Cedex, France
Corresponding author: bonn@lps.ens.fr
Received:
21
December
2001
Accepted:
5
June
2002
We compare the linear and non-linear rheological properties of a typical soft glassy material, the colloidal glass of Laponite, with the predictions of recently developed rheological models based on glassy dynamics, in which particles are trapped in a free-energy landscape with many minima. We find qualitative agreement between theory and experiment for the linear visco-elastic properties. However, for the non-linear response, notably the viscosity under continuous shear flow, important qualitative differences are found. This shows that a developed flow affects the dynamics of relaxation of the material in a more complicated way than what is assumed in the models: not only does the flow alter the energy landscape, but it also modifies the effective temperature controlling the escape rate for a given energy barrier.
PACS: 83.60.-a – Material behavior / 61.43.Fs – Glasses / 83.80.Ab – Solids: e.g., composites, glasses, semicrystalline polymers
© EDP Sciences, 2002
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