Disentangling density and temperature effects in the viscous slowing down of glassforming liquids

Details Disentangling density and temperature effects in the viscous slowing down of glassforming liquids Disentangling density and temperature effects in the viscous slowing down of glassforming liquids

2003-09-25

arxiv.org/abs/cond-mat/0309579v2

J. Chem. Phys. 120, 6135 (2004)

Physics

Condensed Matter

Soft Condensed Matter

RevTeX4, 8 pages, 8 eps figures

Scientific paper

10.1063/1.1649732

We present a consistent picture of the respective role of density and temperature in the viscous slowing down of glassforming liquids and polymers. Specifically, based in part upon a new analysis of simulation and experimental data on liquid ortho-terphenyl, we conclude that a zeroth-order description of the approach to the glass transition should be formulated in terms of a temperature-driven super-Arrhenius activated behavior rather than a density-driven congestion or jamming phenomenon. The density plays a role at a quantitative level, but its effect on the viscosity and the structural relaxation time can be simply described via a single parameter, an effective interaction energy that is characteristic of the high temperature liquid regime; as a result, density does not affect the ``fragility'' of the glassforming system.

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