Density scaling of the diffusion coefficient at various pressures in viscous liquids

Details Density scaling of the diffusion coefficient at various pressures in viscous liquids Density scaling of the diffusion coefficient at various pressures in viscous liquids

2009-03-06

arxiv.org/abs/0903.1307v2

Phys. Rev. E 79, 032501 (2009)

Physics

Condensed Matter

Soft Condensed Matter

Accepted for publication in Phys. Rev. E (2009) Minor typos corrected in the 2nd version

Scientific paper

10.1103/PhysRevE.79.032501

Fundamental thermodynamics and an earlier elastic solid-state point defect model [P. Varotsos and K. Alexopoulos, Phys. Rev B 15, 4111 (1977); 18, 2683 (1978)] are employed to formulate an analytical second-order polynomial function describing the density scaling of the diffusion coefficient in viscous liquids. The function parameters are merely determined by the scaling exponent, which is directly connected with the Gruneisen constant. Density scaling diffusion coefficient isotherms obtained at different pressures collapse on a unique master curve, in agreement with recent computer simulation results of Lennard-Jones viscous liquids, [D. Coslovich and C.M. Roland, J. Phys. Chem. B 112, 1329 (2008)].

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