We explore the dynamical and mechanical characteristics of an evolving gel in diffusing wave spectroscopy (DWS) and rheometry, aiming to assess how the gel evolution impacts the creep response of the system. Our gel is formed by inducing the aggregation of thermosensitive colloids by a variation in temperature. We find experimental evidence that the long time evolution of this gel is due to two distinct processes: A coarsening process that involves the incorporation of mobile particles into the network structure and an aging process that triggers intermittent rearrangement events. While coarsening is the main process governing the evolution of the elastic properties of the gel, aging is the process determining structural relaxation. The combination of both processes in addition to stress hardening governs the creep behavior of the gel, a creep behavior that is determined by three distinct contributions: an instantaneous elastic, a delayed elastic, and a loss contribution. The systematic investigation of these contributions in recovery experiments provides evidence that losses and delayed elastic storage have a common origin, both being due to intermittent local structural relaxation events.
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July 2017
Research Article|
July 01 2017
Interplay of coarsening, aging, and stress hardening impacting the creep behavior of a colloidal gel
D. C. E. Calzolari;
D. C. E. Calzolari
Department of Physics, University of Fribourg
, CH-1700 Fribourg, Switzerland
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I. Bischofberger;
I. Bischofberger
a)
Department of Physics, University of Fribourg
, CH-1700 Fribourg, Switzerland
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F. Nazzani;
F. Nazzani
Department of Physics, University of Fribourg
, CH-1700 Fribourg, Switzerland
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a)
Present address: Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
b)
Author to whom correspondence should be addressed; electronic mail: veronique.Trappe@unifr.ch
Journal of Rheology 61, 817–831 (2017)
Article history
Received:
November 15 2016
Accepted:
May 30 2017
Citation
D. C. E. Calzolari, I. Bischofberger, F. Nazzani, V. Trappe; Interplay of coarsening, aging, and stress hardening impacting the creep behavior of a colloidal gel. Journal of Rheology 1 July 2017; 61 (4): 817–831. https://doi.org/10.1122/1.4986465
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