Interplay between shear loading and structural aging in a physical gel

Details Interplay between shear loading and structural aging in a physical gel Interplay between shear loading and structural aging in a physical gel

2009-05-12

arxiv.org/abs/0905.1775v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We show that the aging of the mechanical relaxation of a gelatin gel exhibits the same scaling phenomenology as polymer and colloidal glasses. Besides, gelatin is known to exhibit logarithmic structural aging (stiffening). We find that stress accelerates this process. However, this effect is definitely irreducible to a mere age shift with respect to natural aging. We suggest that it is interpretable in terms of elastically-aided elementary (coil$\to$helix) local events whose dynamics gradually slows down as aging increases geometric frustration.

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