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Relaxation dynamics in dense binary colloidal mixtures: Brownian dynamics simulations

Sanyal, Subrata and Sood, Ajay K (1998) Relaxation dynamics in dense binary colloidal mixtures: Brownian dynamics simulations. In: Physical Review E, 57 (01). pp. 908-923.

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Official URL: http://prola.aps.org/abstract/PRE/v57/i1/p908_1


Brownian dynamics simulations have been carried out on a binary colloidal mixture of particles of two different diameters interacting via a Derjaguin-Landau-Verway-Overbeek potential. As the screening length is increased a transition from liquid to crystal (at a volume fraction φ=0.2) or a glassy state (at φ=0.3) is observed. Below a certain effective temperature T⋆, the temporal evolution of the mean-squared displacements shows a marked subdiffusive behavior at intermediate and long times. The supercooled liquid with φ=0.3 shows a staircase profile indicating strongly cooperative jump motion which is corroborated by the behavior of van Hove self-correlation functions and the non-Gaussian parameter. The van Hove distinct correlation function, in the β relaxation regime, shows a factorization property in accordance with the mode-coupling theory predictions. The most interesting result is the observation of cooperative hop and subsequent hop-back motion at temperatures close to the glass transition.

Item Type: Journal Article
Publication: Physical Review E
Publisher: American Physical Society
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 29 Dec 2009 10:46
Last Modified: 19 Sep 2010 05:26
URI: http://eprints.iisc.ac.in/id/eprint/19123

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