Chapter

Dynamical heterogeneities in grains and foams

Olivier Dauchot, Douglas J. Durian and Martin van Hecke

in Dynamical Heterogeneities in Glasses, Colloids, and Granular Media

Published in print July 2011 | ISBN: 9780199691470
Published online September 2011 | e-ISBN: 9780191729799 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199691470.003.0006

Series: International Series of Monographs on Physics

Dynamical heterogeneities in grains and foams

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Dynamical heterogeneities have been introduced in the context of the glass transition of molecular liquids and the lengthscale associated with them has been argued to be at the origin of the observed quasi-universal behaviour of glassy systems. Dense amorphous packings of granular media and foams also exhibit slow dynamics, intermittency and heterogeneities. This chapter reviews a number of recent experimental studies of these systems, where one has direct access to the relevant space-time dynamics, allowing for direct visualisations of the dynamical heterogeneities. On one hand these visualisations provide a unique opportunity to access the microscopic mechanisms responsible for the growth of dynamical correlations. On the other hand focussing on the differences in these heterogeneities in microscopically different systems allows to discuss the range of the analogies between molecular thermal glasses and athermal glasses such as granular media and foams. Finally this review provides the opportunity to discuss various approaches to actually extract quantitatively the dynamical lengthscale from experimental data.

Keywords: glass transition; dynamical heterogeneity; granular materials; foams

Chapter.  11212 words.  Illustrated.

Subjects: Mathematical and Statistical Physics

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