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  • Title: Connecting short and long time dynamics in hard-sphere-like colloidal glasses.
    Author: Pastore R, Pica Ciamarra M, Pesce G, Sasso A.
    Journal: Soft Matter; 2015 Jan 21; 11(3):622-6. PubMed ID: 25435455.
    Abstract:
    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.
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