Cooperative jump motions in colloidal glass

Sanyal, Subrata ; Sood, Ajay K. (1997) Cooperative jump motions in colloidal glass Progress of Theoretical Physics - Supplement, 126 . pp. 163-170. ISSN 0375-9687

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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 φ of 0.2 and to glassy state at φ= 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 φ= 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:Article
Source:Copyright of this article belongs to Progress of Theoretical Physics.
ID Code:50291
Deposited On:22 Jul 2011 13:49
Last Modified:22 Jul 2011 13:49

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