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Interplay between Shear Loading and Structural Aging in a Physical Gelatin Gel

Abstract : We show that the aging of the mechanical relaxation of a gelatin gel exhibits the same scaling phenomenology as polymer and colloidal glasses. In addition, 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 -> helix) local events whose dynamics gradually slows down as aging increases geometric frustration.
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Submitted on : Monday, December 7, 2015 - 5:28:52 PM
Last modification on : Saturday, January 15, 2022 - 3:44:22 AM

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Olivier Ronsin, C. Caroli, Tristan Baumberger. Interplay between Shear Loading and Structural Aging in a Physical Gelatin Gel. Physical Review Letters, American Physical Society, 2009, 103 (13), pp.138302. ⟨10.1103/PhysRevLett.103.138302⟩. ⟨hal-01239423⟩

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