1. Ultra-long range correlations of the dynamics of jammed soft matter
- Author
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Simona Maccarrone, Eugene Pashkovski, Agnès Duri, Veronique Trappe, Matteo Ciccotti, Olivier Pravaz, Jean-Marc Fromental, Alex Lips, Luca Cipelletti, Giovanni Brambilla, David A. Sessoms, Laboratoire des colloïdes, verres et nanomatériaux (LCVN), Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS), Unilever Res Labs, Unilever, Unilever R&D, Physics Department (FRIBPHYS), Albert-Ludwigs-Universität Freiburg, PICS N. 2410 (CNRS) CNES Swiss NSF, and ANR-07-BLAN-0157,DynHet,Quantitative characterisation of dynamic heterogeneities in glassy materials: models, simulations and new experiments(2007)
- Subjects
Length scale ,Spatial correlation ,slow dynamics ,FOS: Physical sciences ,02 engineering and technology ,Condensed Matter - Soft Condensed Matter ,01 natural sciences ,light scattering ,Light scattering ,Dynamic light scattering ,0103 physical sciences ,Statistical physics ,Soft matter ,Elasticity (economics) ,010306 general physics ,jamming ,Physics ,Condensed matter physics ,PCI ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Condensed Matter::Soft Condensed Matter ,Orders of magnitude (time) ,Soft Condensed Matter (cond-mat.soft) ,Particle size ,0210 nano-technology ,[PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] - Abstract
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., Comment: To appear in Soft Matter
- Published
- 2010