Slow dynamics and aging in colloidal gels studied by x-ray photon correlation spectroscopy. 2007

Andrei Fluerasu, and Abdellatif Moussaïd, and Anders Madsen, and Andrew Schofield
European Synchrotron Radiation Facility, Boîte Postale 220, F-38043 Grenoble, France.

Slow, nonequilibrium dynamics during delayed sedimentation in a colloidal depletion gel was studied by x-ray photon correlation spectroscopy. The intermediate scattering functions change during the process from stretched to compressed exponential decays, indicating a jamming transition toward full aging. A complex aging behavior follows this process; it is proposed that large-scale network deformations trigger an unjamming, leading to the final collapse of the gel.

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