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Cooperative jump motions in colloidal glass

Sanyal, Subrata and Sood, Ajay K (1997) Cooperative jump motions in colloidal glass. In: Progress Of Theoretical Physics Supplement, 126 . pp. 163-170.

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We report Brownian dynamics simulation results on binary colloidal mixtures of particles of two different diameters interacting via a repulsive DLVO potential. As the effective temperature is lowered by reducing charged impurity concentration, a transition from liquid to crystal at a total volume fraction phi of 0.2 and to glassy state at phi = 0.3 are observed. The mean squared displacements show a marked subdiffusive behavior at intermediate and long times below a certain temperature. The particle motion in supercooled liquid with phi = 0.3 is strongly cooperative as revealed by mean squared displacements, self-part of van-Hove density correlation functions and non-Gaussian parameter. Interestingly, a few particles exhibit cooperative hop and subsequent hop-back motion at temperatures very close to the glass transition.

Item Type: Journal Article
Publication: Progress Of Theoretical Physics Supplement
Publisher: Kyoto University
Additional Information: Copyright of this article belongs to Progress of Theoretical Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 Mar 2009 05:28
Last Modified: 19 Sep 2010 05:25
URI: http://eprints.iisc.ac.in/id/eprint/18777

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