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Prog. Theor. Phys. Supplement No.126 (1997) pp. 163-170

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Cooperative Jump Motions in Colloidal Glass

Subrata Sanyal1,* and Ajay K. Sood2

1Department of Chemical Engineering, University of California, Santa Barbara California 93106-5080, USA
2Department of Physics, Indian Institute of Science, Bangalore 560 012, India

Abstract:

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.


URL : http://ptp.ipap.jp/link?PTPS/126/163/
DOI : 10.1143/PTPS.126.163


*Author for correspondence. E-mail: subrata@navier.chemengr.ucsb.edu

[ Full Text PDF : FREE ACCESS (439K) ] Citation:

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