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5 - Rheology of Colloidal Glasses and Gels

Published online by Cambridge University Press:  07 April 2021

By
George Petekidis  and
Norman J. Wagner
Edited by
Norman J. Wagner  and
Jan Mewis
Norman J. Wagner
Affiliation:
University of Delaware
Jan Mewis
Affiliation:
KU Leuven, Belgium
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Summary

When the particle concentration and/or the interparticle forces are sufficiently increased, structures with a solid-like response will develop in colloidal systems. This is dealt with in this chapter, mainly for simple systems, comprised of hard or nearly hard spheres with interparticle attractions. Models have been developed for their state diagrams and have been confirmed by a range of experimental techniques. Gel and glass phases can be distinguished. Glasses occur more commonly at sufficiently concentrated suspensions of hard spheres, but also for suspensions of particles with weak attractions. Gelation occurs at lower volume fractions for suspensions with interparticle attractions, which results in either homogeneous (or equilibrium) gels or heterogeneous gels depending on the nature of the forces. The complex rheology of gels and glasses includes nonlinear viscoelasticity, creep, transient start-up shear, yield strain, and stress. Their nonequilibrium nature has significant consequences for their rheology, including time and shear rate effects. Applying shear causes a change in the microstructure, which recovers when the flow is arrested. For glasses this is known as rejuvenation and aging, respectively. Time and shear effects are stronger in gels where more complex microstructures are involved, leading to a more variable, time-dependent, rheological response.

Keywords

glassesgelsrheologydynamic arrestnonergodicthermoreversiblephase separationjamming
Type
Chapter
Information
Theory and Applications of Colloidal Suspension Rheology , pp. 173 - 226
Publisher: Cambridge University Press
Print publication year: 2021

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