Thermodynamic scaling of diffusion in supercooled Lennard-Jones liquids

The Journal of Physical Chemistry. B
D Coslovich, C M Roland

Abstract

The manner in which the intermolecular potential u(r) governs structural relaxation in liquids is a long standing problem in condensed matter physics. Herein, we show, in agreement with recent experimental results, that diffusion coefficients for simulated Lennard-Jones m-6 liquids (8 < or = m < or = 36) in normal and moderately supercooled states are a unique function of the variable rhogamma/T, where rho is density and T is temperature. The scaling exponent gamma is a material specific constant whose magnitude is related to the steepness of the repulsive part of u(r), evaluated around the distance of closest approach between particles probed in the supercooled regime. Approximations of u(r) in terms of inverse power laws are also discussed.

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Citations

Sep 29, 2011·The European Physical Journal. E, Soft Matter·L Berthier, G Tarjus
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Feb 2, 2011·The Journal of Chemical Physics·Sebastian PawlusAndrzej Grzybowski
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