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Interplay between shear loading and structural aging in a physical gelatin gel.

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  • 1INSP, UPMC Université Paris 06, CNRS UMR 7588, 75015 Paris, France.

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Mechanical relaxation in gelatin gels ages similarly to polymer and colloidal glasses. Applied stress accelerates this aging process, suggesting a mechanism beyond simple time shifts, involving local structural changes.

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Rheology

Background:

  • Gelatin gels exhibit logarithmic structural aging, characterized by stiffening over time.
  • Understanding the aging dynamics of soft materials like gelatin is crucial for predicting their long-term behavior and performance.
  • Previous studies have established similarities between gelatin aging and that of polymer and colloidal glasses.

Purpose of the Study:

  • To investigate the effect of mechanical stress on the aging process of gelatin gels.
  • To determine if stress-induced acceleration of aging can be explained by simple time-shift phenomena.
  • To elucidate the underlying molecular mechanisms responsible for stress-accelerated aging in gelatin.

Main Methods:

  • Mechanical testing of gelatin gels under varying stress conditions.
  • Analysis of mechanical relaxation data to identify aging phenomenology.
  • Comparison of stress-accelerated aging with natural aging processes.

Main Results:

  • The aging of mechanical relaxation in gelatin gels follows the same scaling laws observed in polymer and colloidal glasses.
  • Applied stress significantly accelerates the logarithmic structural aging (stiffening) of gelatin gels.
  • This acceleration is not reducible to a simple age shift, indicating a distinct physical mechanism.

Conclusions:

  • Stress accelerates gelatin gel aging through a mechanism involving elastically aided local events, specifically coil-to-helix transitions.
  • The dynamics of these local events progressively slow down with increasing aging, linked to growing geometric frustration.
  • The findings provide new insights into the aging of biopolymer gels and soft glassy materials under mechanical load.