Aging of a colloidal “Wigner” glass

We study the aging of a colloidal glass, which is obtained for extremely low volume fractions due to strong electrostatic repulsions, leading to the formation of a “Wigner glass”. During the aging, a new crossover between a complete and incomplete decay of the correlation function is observed, accom...

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Bibliographic Details
Published in:Europhysics letters 1999-01, Vol.45 (1), p.52-57
Main Authors: Bonn, D., Tanaka, H., Wegdam, G., Kellay, H., Meunier, J.
Format: Article
Language:English
Subjects:
61.20.Lc
64.70.Pf
Physics
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Summary:We study the aging of a colloidal glass, which is obtained for extremely low volume fractions due to strong electrostatic repulsions, leading to the formation of a “Wigner glass”. During the aging, a new crossover between a complete and incomplete decay of the correlation function is observed, accompanied by an increase in the non-ergodicity parameter. The dynamics can be described as a cage-diffusion process. For short times, the escape of the particles from “cages” formed by neighbouring particles dominates; for long times the particles cannot escape anymore and the system becomes strongly non-ergodic.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i1999-00130-3