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Abstract: Shear localization in an aqueous clay suspension of Laponite is investigatedthrough dynamic light scattering, which provides access both to the dynamics ofthe system (homodyne mode) and to the local velocity profile (heterodyne mode).When the shear bands form, a relaxation of the dynamics typical of a gel phaseis observed in the unsheared band soon after flow stop, suggesting that anarrested dynamics is present during the shear localization regime. Periodicoscillations of the flow behavior, typical of a stick-slip phenomenon, are alsoobserved when shear localization occurs. Both results are discussed in thelight of various theoretical models for soft glassy materials.



Autor: F. Ianni, R. Di Leonardo, S. Gentilini, G. Ruocco

Fuente: https://arxiv.org/







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