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Experimental verification of democratic particle motions by direct imaging of glassy colloidal systems

By J. Ariel Rodriguez Fris, Gustavo A. Appignanesi and Eric R. Weeks

Abstract

We analyze data from confocal microscopy experiments of a colloidal suspension to validate predictions of rapid sporadic events responsible for structural relaxation in a glassy sample. The trajectories of several thousand colloidal particles are analyzed, confirming the existence of rapid sporadic events responsible for the structural relaxation of significant regions of the sample, and complementing prior observations of dynamical heterogeneity. The emergence of relatively compact clusters of mobility allows the dynamics to transition between the large periods of local confinement within its potential energy surface, in good agreement with the picture envisioned long ago by Adam and Gibbs and Goldstein.Comment: 4 pages, 5 figure

Topics: Condensed Matter - Soft Condensed Matter, Physics - Chemical Physics
Year: 2011
DOI identifier: 10.1103/PhysRevLett.107.065704
OAI identifier: oai:arXiv.org:1103.1094
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