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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Abstract
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/ | |||||||||||||||||||||
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Document Type: | Article | |||||||||||||||||||||
Title: | Binary colloidal glasses: linear viscoelasticity and its link to the microscopic structure and dynamics | |||||||||||||||||||||
Authors: |
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Date: | March 2019 | |||||||||||||||||||||
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: | 15 | |||||||||||||||||||||
DOI: | 10.1039/C8SM01349G | |||||||||||||||||||||
Page Range: | pp. 2232-2244 | |||||||||||||||||||||
Publisher: | Royal Society of Chemistry | |||||||||||||||||||||
ISSN: | 1744-683X | |||||||||||||||||||||
Status: | Published | |||||||||||||||||||||
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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