Nonlinear dynamic response of glass-forming liquids to random pinning Auteur(s): Kob W., Coslovich D. (Article) Publié: Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 90 p.052305 (2014) Texte intégral en Openaccess : Ref HAL: hal-01101053_v1 PMID 25493794 Ref Arxiv: 1403.3519 DOI: 10.1103/PhysRevE.90.052305 WoS: 000345539100004 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 26 Citations Résumé: We use large scale computer simulations of a glass-forming liquid in which a fraction c of the particles has been permanently pinned. We find that the relaxation dynamics shows an exponential dependence on c. This result can be rationalized by assuming that the configurational entropy of the pinned liquid decreases linearly upon increasing of c. This behavior is discussed in the context of thermodynamic theories for the glass transition, notably the Adam-Gibbs picture and the random first order transition theory. For intermediate and low temperatures we find that the slowing down of the dynamics due to the pinning saturates and that the cooperativity decreases with increasing c, results which indicate that in glass-forming liquids there is a dynamic crossover at which the shape of the relaxing entities changes. |