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The role of attractive forces in viscous liquids | | Ludovic Berthier
; Gilles Tarjus
; | | Date: |
2 Mar 2011 | | Abstract: | We present evidence from computer simulation that the slowdown of relaxation
of a standard Lennard-Jones glass-forming liquid and that of its reduction to a
model with truncated pair potentials without attractive tails is quantitatively
and qualitatively different in the viscous regime. The pair structure of the
two models is however very similar. This finding, which appears to contradict
the common view that the physics of dense liquids is dominated by the steep
repulsive forces between atoms, is characterized in detail, and its
consequences are explored. Beyond the role of attractive forces themselves, a
key aspect in explaining the differences in the dynamical behavior of the two
models is the truncation of the interaction potentials beyond a cutoff at
typical interatomic distance. This leads us to question the ability of the
jamming scenario to describe the physics of glass-forming liquids and polymers. | | Source: | arXiv, 1103.0432 | | Services: | Forum | Review | PDF | Favorites | |
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