Cooperative strings and glassy dynamics in various confined geometries

Maxence Arutkin (1) , Elie Raphaël (1) , James A Forrest (2) , Thomas Salez (3)

1 Gulliver (UMR 7083)
2 Perimeter Institute for Theoretical Physics [Waterloo]
3 LOMA - Laboratoire Ondes et Matière d'Aquitaine

Previously, we developed a minimal model based on random cooperative strings for the relaxation of supercooled liquids in the bulk and near free interfaces, and we recovered some key experimental observations. In this article, after recalling the main ingredients of the cooperative string model, we study the effective glass transition and surface mobility of various experimentally-relevant confined geometries: freestanding films, supported films, spherical particles, and cylindrical particles, with free interfaces and/or passive substrates. Finally, we introduce a novel way to account for a purely attractive substrate, and explore the impact of the latter in the previous geometries.

Domaines: Matière Molle [cond-mat.soft]; Science des matériaux [cond-mat.mtrl-sci]; Mécanique statistique [cond-mat.stat-mech]; Systèmes désordonnés et réseaux de neurones [cond-mat.dis-nn]; Dynamique des Fluides [physics.flu-dyn]; Mécanique des solides [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Maxence Arutkin, Elie Raphaël, James A Forrest, Thomas Salez. Cooperative strings and glassy dynamics in various confined geometries. Physical Review E , 2020, 101, pp.032122. ⟨hal-02383221⟩