Connecting short and long time dynamics in hard-sphere-like colloidal glasses

Glass-forming materials are characterized by an intermittent motion at the microscopic scale. Particles spend most of their time rattling within the cages formed by their neighbors, and seldom jump to a different cage. In molecular glass formers the temperature dependence of the jump features, such...

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Published inSoft matter Vol. 11; no. 3; pp. 622 - 626
Main Authors Pastore, Raffaele, Pica Ciamarra, Massimo, Pesce, Giuseppe, Sasso, Antonio
Format Journal Article
LanguageEnglish
Published England 21.01.2015
Subjects
Cages
Colloids
Diffusivity
Dynamic tests
Dynamical systems
Dynamics
Glass
Volume fraction
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Summary:Glass-forming materials are characterized by an intermittent motion at the microscopic scale. Particles spend most of their time rattling within the cages formed by their neighbors, and seldom jump to a different cage. In molecular glass formers the temperature dependence of the jump features, such as the average caging time and jump length, characterizes the relaxation processes and allows for a short-time prediction of the diffusivity. Here we experimentally investigate the cage-jump motion of a two-dimensional hard-sphere-like colloidal suspension, where the volume fraction is the relevant parameter controlling the slowing down of the dynamics. We characterize the volume fraction dependence of the cage-jump features and show that, as in molecular systems, they allow for a short time prediction of the diffusivity. We connect the intermittent single particle motion and the macroscopic dynamics in experiments on colloidal glasses.
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ISSN:1744-683X
1744-6848
DOI:10.1039/c4sm02147a