Nonperturbative effect of attractive forces in viscous liquids

Details Nonperturbative effect of attractive forces in viscous liquids Nonperturbative effect of attractive forces in viscous liquids

2009-07-14

arxiv.org/abs/0907.2343v1

Phys. Rev. Lett. 103, 170601 (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.103.170601

We study the role of the attractive intermolecular forces in the viscous regime of a simple glass-forming liquid by using computer simulations. To this end, we compare the structure and the dynamics of a standard Lennard-Jones glass-forming liquid model with and without the attractive tail of the interaction potentials. The viscous slowing down of the two systems are found to be quantitatively and qualitatively different over a broad density range, whereas the static pair correlations remain close. The common assumption that the behaviour of dense nonassociated liquids is determined by the short-ranged repulsive part of the intermolecular potentials dramatically breaks down for the relaxation in the viscous liquid regime.

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