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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents



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ID: 57870.0, MPI für Polymerforschung / MPI Polymerforschung
The breakdown of the Stokes-Einstein relation in supercooled binary liquids
Authors:Bordat, P.; Affouard, F.; Descamps, M.; Müller-Plathe, Florian
Language:English
Date of Publication (YYYY-MM-DD):2003-08-20
Title of Journal:Journal of Physics-Condensed Matter
Journal Abbrev.:J. Phys.-Condens. Matter
Volume:15
Issue / Number:32
Start Page:5397
End Page:5407
Review Status:not specified
Audience:Not Specified
Abstract / Description:Using reverse non-equilibrium molecular dynamics simulations, we report the calculation of the shear viscosity and the tracer diffusion coefficient of a binary Lennard-Jones mixture that is known as a model glass-former. Several remarkable temperatures are well reproduced in our calculations, i.e. TS (the onset of slow dynamics), Tc (the critical temperature predicted by the mode-coupling theory) and TK (the Kauzmann temperature). A breakdown of the Stokes-Einstein relation is found at temperature TS. We propose that, at low temperatures below TS, the size of single-particle positional fluctuations between particle-hopping events corresponds to the length measured by the Stokes-Einstein relation, which is equated to the hydrodynamic radius of particles at high temperatures.
Comment of the Author/Creator:Date: 2003, AUG 20
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Univ Lille 1, Lab Dynam & Struct Mat Mol, UMR 8024, F-59655 Villeneuve Dascq, France.
Identifiers:ISI:000185420400006 [ID No:1]
ISSN:0953-8984 [ID No:2]
LOCALID:P-03-214
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