Origin of the slow dynamics and the aging of a soft glass

Physics – Condensed Matter – Soft Condensed Matter

Scientific paper

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published in PRL 97, 238301, 2006

Scientific paper

10.1103/PhysRevLett.97.238301

We study by light microscopy a soft glass consisting of a compact arrangement of polydisperse elastic spheres. We show that its slow and non-stationary dynamics results from the unavoidable small fluctuations of temperature, which induce intermittent local mechanical shear in the sample, because of thermal expansion and contraction. Temperature-induced shear provokes both reversible and irreversible rearrangements whose amplitude decreases with time, leading to an exponential slowing down of the dynamics with sample age.

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