Dynamics of internal stresses and scaling of strain recovery in an aging colloidal gel

Dynamics of internal stresses and scaling of strain recovery in an aging colloidal gel

We monitor the relaxation of internal stresses in a fractal colloidal gel on cessation of flow and find a weak power-law decay, sigmai approximately t(-alpha) over five decades of time where alpha approximately 0.07. The system exhibits physical aging of the elastic modulus, G' approximately tb...

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Veröffentlicht in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2009-07, Vol.80 (1 Pt 1), p.010404-010404, Article 010404
Hauptverfasser: Negi, Ajay Singh, Osuji, Chinedum O
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Osuji, Chinedum O
description We monitor the relaxation of internal stresses in a fractal colloidal gel on cessation of flow and find a weak power-law decay, sigmai approximately t(-alpha) over five decades of time where alpha approximately 0.07. The system exhibits physical aging of the elastic modulus, G' approximately tbeta, with beta approximately alpha . Imposition of zero stress after waiting time tw results in strain recovery as the system relaxes without constraint. Remarkably, recoveries at different tw can be shifted to construct a master curve where data are scaled vertically by 1/sigmai(tw) and plotted horizontally as (t-tw)/twmu, where mu is approximately 1.25, indicative of a superaging response.
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title Dynamics of internal stresses and scaling of strain recovery in an aging colloidal gel
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