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Rheological aging and rejuvenation in microgel pastes

Cloitre1, Borrega, Leibler

  • 1Laboratoire CNRS-ATOFINA, 95, rue Danton, 92303 Levallois-Perret, France.

Physical Review Letters
|November 18, 2000
PubMed
Summary

Concentrated microgel suspensions exhibit history-dependent rheological behavior, showing aging and rejuvenation effects similar to glassy systems. Stress amplitude influences memory and the slow evolution of these soft materials.

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Area of Science:

  • Materials Science
  • Rheology
  • Soft Matter Physics

Background:

  • Concentrated suspensions of soft deformable microgels are complex fluids.
  • Understanding their rheological behavior is crucial for various applications.

Purpose of the Study:

  • To experimentally investigate the rheological properties of concentrated microgel suspensions below their yield point.
  • To analyze history-dependent effects and their underlying mechanisms.

Main Methods:

  • Experimental rheological measurements were performed on concentrated microgel suspensions.
  • The study focused on the behavior below the yield point.

Main Results:

  • History-dependent effects, including aging and rejuvenation, were observed.

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  • These phenomena are analogous to those found in glassy systems.
  • Stress amplitude was identified as a key factor controlling long-time memory and suspension evolution.

    • Conclusions:

    • Microgel suspensions exhibit complex, time-dependent rheological behavior.
    • Aging and rejuvenation are significant in these soft materials.
    • Stress amplitude plays a critical role in dictating the dynamic evolution of microgel suspensions.