Size-Dependent Localization in Polydisperse Colloidal Glasses

Size-Dependent Localization in Polydisperse Colloidal Glasses We have investigated concentrated suspensions of polydisperse hard spheres and have determined the dynamics and sizes of individual particles using confocal microscopy. With increasing concentration, the dynamics of the small and large particles start to differ. The large particles exhibit slower dynamics and stronger localization. Moreover, as the particle size increases, the local volume fraction ϕloc also increases. In the glass state, the localization length significantly decreases beyond ϕloc≈0.67. This suggests a link between local crowding and dynamical heterogeneities. However dynamical arrest of subpopulations seems not directly linked to a large value of ϕloc, indicating the importance of collective effects. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Size-Dependent Localization in Polydisperse Colloidal Glasses

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Size-Dependent Localization in Polydisperse Colloidal Glasses

Abstract

We have investigated concentrated suspensions of polydisperse hard spheres and have determined the dynamics and sizes of individual particles using confocal microscopy. With increasing concentration, the dynamics of the small and large particles start to differ. The large particles exhibit slower dynamics and stronger localization. Moreover, as the particle size increases, the local volume fraction ϕloc also increases. In the glass state, the localization length significantly decreases beyond ϕloc≈0.67. This suggests a link between local crowding and dynamical heterogeneities. However dynamical arrest of subpopulations seems not directly linked to a large value of ϕloc, indicating the importance of collective effects.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
0031-9007
eISSN
1079-7114
D.O.I.
10.1103/PhysRevLett.119.048003
Publisher site
See Article on Publisher Site

Abstract

We have investigated concentrated suspensions of polydisperse hard spheres and have determined the dynamics and sizes of individual particles using confocal microscopy. With increasing concentration, the dynamics of the small and large particles start to differ. The large particles exhibit slower dynamics and stronger localization. Moreover, as the particle size increases, the local volume fraction ϕloc also increases. In the glass state, the localization length significantly decreases beyond ϕloc≈0.67. This suggests a link between local crowding and dynamical heterogeneities. However dynamical arrest of subpopulations seems not directly linked to a large value of ϕloc, indicating the importance of collective effects.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Jul 28, 2017

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