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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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|
|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|
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