The role of attractive forces in viscous liquids Auteur(s): Berthier L., Tarjus Gilles (Article) Publié: The Journal Of Chemical Physics, vol. 134 p.214503 (2011) Texte intégral en Openaccess : Ref HAL: hal-00600672_v1 Ref Arxiv: 1103.0432 DOI: 10.1063/1.3592709 WoS: 000291402700027 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 73 Citations Résumé: 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. Commentaires: 13 pages, 12 figures Journal: J. Chem. Phys. 134, 214503 (2011) |