Ultra-long range correlations of the dynamics of jammed soft matter

We use photon correlation imaging, a recently introduced space-resolved dynamic light scattering method, to investigate the spatial correlation of the dynamics of a variety of jammed and glassy soft materials. Strikingly, we find that in deeply jammed soft materials spatial correlations of the dynam...

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Bibliographic Details
Published in:Soft matter 2010-11, Vol.6 (21), p.5514-5522
Main Authors: Maccarrone, S, Brambilla, G, Pravaz, O, Duri, A, Ciccotti, M, Fromental, J.-M, Pashkovski, E, Lips, A, Sessoms, D, Trappe, V, Cipelletti, L
Format: Article
Language:English
Subjects:
Colloids
Condensed Matter
Correlation
Dynamic tests
Dynamical systems
Dynamics
Elasticity
Light scattering
Networks
Physics
Soft Condensed Matter
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Summary:We use photon correlation imaging, a recently introduced space-resolved dynamic light scattering method, to investigate the spatial correlation of the dynamics of a variety of jammed and glassy soft materials. Strikingly, we find that in deeply jammed soft materials spatial correlations of the dynamics are quite generally ultra-long ranged, extending up to the system size, orders of magnitude larger than any relevant structural length scale, such as the particle size, or the mesh size for colloidal gel systems. This has to be contrasted with the case of molecular, colloidal and granular "supercooled" fluids, where spatial correlations of the dynamics extend over a few particles at most. Our findings suggest that ultra long range spatial correlations in the dynamics of a system are directly related to the origin of elasticity. While solid-like systems with entropic elasticity exhibit very moderate correlations, systems with enthalpic elasticity exhibit ultra-long range correlations due to the effective transmission of strains throughout the contact network. Novel space-resolved dynamic light scattering experiments show that jammed soft materials exhibit ultra-long spatial correlations of their slow dynamics.
ISSN:1744-683X
1744-6848
DOI:10.1039/c0sm00155d