Subdiffusion and the cage effect studied near the colloidal glass transition

Details Subdiffusion and the cage effect studied near the colloidal glass transition Subdiffusion and the cage effect studied near the colloidal glass transition

2001-11-05

arxiv.org/abs/cond-mat/0111073v1

Chemical Physics_284_, 361-367 (2002)

Physics

Condensed Matter

Disordered Systems and Neural Networks

submitted to Chemical Physics, special issue on "Strange Kinetics"

Scientific paper

10.1016/S0301-0104(02)00667-5

The dynamics of a glass-forming material slow greatly near the glass transition, and molecular motion becomes inhibited. We use confocal microscopy to investigate the motion of colloidal particles near the colloidal glass transition. As the concentration in a dense colloidal suspension is increased, particles become confined in transient cages formed by their neighbors. This prevents them from diffusing freely throughout the sample. We quantify the properties of these cages by measuring temporal anticorrelations of the particles' displacements. The local cage properties are related to the subdiffusive rise of the mean square displacement: over a broad range of time scales, the mean square displacement grows slower than linearly in time.

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