Rejuvenation and overaging in a colloidal glass under shear
Virgile Viasnoff, Francois Lequeux (ESPCI, LPM, 10 rue Vauquelin, France)
TL;DR
This study investigates how shear affects the microscopic dynamics of a colloidal glass, showing that high shear rejuvenates while moderate shear causes overaging, analyzed through the Bouchaud's trap model.
Contribution
It demonstrates the dual effects of shear on colloidal glasses and applies Bouchaud's trap model to interpret these phenomena.
Findings
High shear rejuvenates the colloidal glass.
Moderate shear causes overaging.
Shear modifies relaxation dynamics as analyzed by the trap model.
Abstract
We report the modifications of the microscopic dynamics of a colloidal glass submitted to shear. We use multispeckle diffusing wave spectroscopy to monitor the evolution of the spontaneous slow relaxation processes after the sample have been submitted to various straining. We show that high shear rejuvenates the system and accelerates its dynamics whereas moderate shear overage the system. We analyze this phenomena within the frame of the Bouchaud's trap model.
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