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Ultralong-ranged spatial correlations of the dynamics of jammed systems | | Agnes Duri
; David A. Sessoms
; Veronique Trappe
; Luca Cipelletti
; | | Date: |
14 Oct 2008 | | Abstract: | We introduce a dynamic light scattering method, termed Space and Time
Resolved Correlation (STRC), which enables us to resolve the dynamics of soft
materials in space and time. We demonstrate STRC by investigating the slow
dynamics of two jammed systems, a quasi two-dimensional foam made of deformable
bubbles and a rigid gel network formed by strongly attractive colloidal
particles. We find the dynamics of both systems to be determined by
intermittent rearrangement events. For the foam, the events extend over a few
bubble sizes, but a small, finite dynamical correlation is observed up to
macroscopic length scales. For the gel, rearrangement events involve correlated
motion over surprisingly large distances, comparable to the system size. These
results indicate that dynamical correlations in jammed systems can be extremely
long-ranged and point to the key role of mechanical properties in determining
dynamical correlations. | | Source: | arXiv, 0810.2431 | | Services: | Forum | Review | PDF | Favorites | |
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