Non-Gaussian nature of glassy dynamics by cage to cage motion

Journal Article · Mon Jan 15 00:00:00 EST 2007 · Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

DOI:https://doi.org/10.1103/PHYSREVE.75.011504· OSTI ID:21072272

Vorselaars, Bart; Lyulin, Alexey V; Michels, M A. J. ^[1]; Karatasos, K ^[2]

---

1. Group Polymer Physics, Eindhoven Polymer Laboratories and Dutch Polymer Institute, Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven (Netherlands)
2. Chemical Engineering Department, Aristotle Univerisity of Thessaloniki, 54124 Thessaloniki (Greece)

A model based on a single Brownian particle moving in a periodic effective field is used to understand the non-Gaussian dynamics in glassy systems of cage escape and subsequent recaging, often thought to be caused by a heterogeneous glass structure. The results are compared to molecular-dynamics simulations of systems with varying complexity: quasi-two-dimensional colloidlike particles, atactic polystyrene, and a dendritic glass. The model nicely describes generic features of all three topologically different systems, in particular around the maximum of the non-Gaussian parameter. This maximum is a measure for the average distance between cages.

• OSTI ID: 21072272
• Journal Information: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Vol. 75, Issue 1; Other Information: DOI: 10.1103/PhysRevE.75.011504; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-651X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BROWNIAN MOVEMENT
COLLOIDS
COMPUTERIZED SIMULATION
DENDRITES
GLASS
MOLECULAR DYNAMICS METHOD
PERIODICITY
POLYSTYRENE