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Binary colloidal glasses: linear viscoelasticity and its link to the microscopic structure and dynamics

Sentjabrskaja, Tatjana and Jacob, Alan R. and Egelhaaf, S. U. and Petekidis, G. and Voigtmann, Thomas and Laurati, Marco (2019) Binary colloidal glasses: linear viscoelasticity and its link to the microscopic structure and dynamics. Soft Matter, 15, pp. 2232-2244. Royal Society of Chemistry. doi: 10.1039/C8SM01349G. ISSN 1744-683X.

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We study the relation between the microscopic structure and dynamics and the macroscopic rheological response of glass-forming colloidal suspensions, namely binary colloidal hard-sphere mixtures with large size asymmetry (1 : 5) that span a large range of mixture compositions close to the glass transition. The dynamical shear moduli are measured by oscillatory rheology and the structure and dynamics on the single-particle level by confocal microscopy. The data are compared with Brownian Dynamics simulations and predictions from mode-coupling theory based on the Percus-Yevick approximation. Experiments, simulations and theory consistently observe a strong decrease of the intermediate-frequency mechanical moduli combined with faster dynamics at intermediate mixing ratios and hence a non-monotonic dependence of these parameters but a localization of the large particles which decreases monotonically as the fraction of small particles is increased. We find that the Generalized-Stokes Einstein relation applied to the mean square displacements of the two components leads to a reasonable estimate of the shear moduli of the mixtures and hence links the rheological response to the particle dynamics which in turn reflects the microscopic structure.

Item URL in elib:https://elib.dlr.de/126742/
Document Type:Article
Title:Binary colloidal glasses: linear viscoelasticity and its link to the microscopic structure and dynamics
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sentjabrskaja, TatjanaUniversity of DüsseldorfUNSPECIFIED
Jacob, Alan R.FORTH Heraklion, GreeceUNSPECIFIED
Egelhaaf, S. U.Heinrich-Heine-Universität DüsseldorfUNSPECIFIED
Petekidis, G.FORTH Heraklion, GreeceUNSPECIFIED
Voigtmann, Thomasthomas.voigtmann (at) dlr.dehttps://orcid.org/0000-0002-1261-9295
Laurati, MarcoUniversidad de LeonUNSPECIFIED
Date:March 2019
Journal or Publication Title:Soft Matter
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 2232-2244
Publisher:Royal Society of Chemistry
Keywords:glass transition; binary mixtures; rheology; shear modulus; linear viscoelasticity
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 - Research under Space Conditions
DLR - Research theme (Project):R - Material Design and New Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:11 Mar 2019 10:52
Last Modified:06 Sep 2019 15:20

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