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Glassy relaxation slows down by increasing mobility

Mandal, Suvendu and Franosch, Thomas and Voigtmann, Thomas (2018) Glassy relaxation slows down by increasing mobility. Soft Matter, 14, pp. 9153-9158. Royal Society of Chemistry. DOI: 10.1039/C8SM01581C ISSN 1744-683X

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Abstract

We find a striking trend reversal in the relaxation dynamics of mixtures with strong dynamical asymmetry. Simulations by both Brownian and Newtonian dynamics reveal that in mixtures of fast and slow hard spheres, above a critical density, the dynamics becomes slower upon increasing the mobility of the fast particles. Below that density, the same increase in mobility speeds up the dynamics. The critical density itself can be identified with the glass transition of the mode-coupling theory that does not depend on the dynamical asymmetry. The asymptotic dynamics close to the critical density is universal, but strong pre-asymptotic effects prevail in particular when the dynamical asymmetry also involves size asymmetry. Our observations reconcile earlier findings, where a strong dependence on kinetic parameters was found for the glassy dynamics, with the paradigm that the glass transition is determined by the properties of configuration space alone.

Item URL in elib:https://elib.dlr.de/123551/
Document Type:Article
Title:Glassy relaxation slows down by increasing mobility
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mandal, SuvenduUniversität Düsseldorfhttps://orcid.org/0000-0002-2798-2839
Franosch, ThomasUniversität Innsbruckhttps://orcid.org/0000-0002-6204-7192
Voigtmann, Thomasthomas.voigtmann (at) dlr.dehttps://orcid.org/0000-0002-1261-9295
Date:22 November 2018
Journal or Publication Title:Soft Matter
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:14
DOI :10.1039/C8SM01581C
Page Range:pp. 9153-9158
Publisher:Royal Society of Chemistry
ISSN:1744-683X
Status:Published
Keywords:glass transition; binary mixtures; diffusion coefficients
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialforschung und Mikrogravitation (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:22 Nov 2018 15:13
Last Modified:06 Sep 2019 15:20

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