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Related Experiment Videos

Residual stresses in colloidal gels.

Esmaeel Moghimi1, Alan R Jacob, George Petekidis

  • 1FORTH/IESL and Department of Materials Science and Technology, University of Crete, 71110 Heraklion, Greece. georgp@iesl.forth.gr.

Soft Matter
|October 14, 2017
PubMed
Summary

Internal stresses in colloidal gels depend on shear rate. At high rates, stresses fully relax, but at low rates, residual stresses remain due to attractive forces and incomplete structural recovery.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Rheology

Background:

  • Colloidal gels exhibit complex behavior under shear flow.
  • Understanding internal stresses after flow cessation is crucial for material properties.
  • Attractive forces play a significant role in gel structure and dynamics.

Purpose of the Study:

  • To investigate internal stress relaxation in colloidal gels after steady shear.
  • To determine the influence of shear rate on stress relaxation patterns.
  • To elucidate the role of attractive forces in residual stress formation.

Main Methods:

  • Combined experimental techniques and Brownian Dynamics (BD) simulations.
  • Studied a model colloidal gel with tunable attractions via polymer additives.

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  • Analyzed stress relaxation dynamics at various shear rates post-flow cessation.

    • Main Results:

    • Observed two distinct stress relaxation patterns based on shear rate.
    • High shear rates led to complete stress relaxation, resembling liquid behavior.
    • Low shear rates resulted in partial stress relaxation, indicative of arrested states.
    • Residual stresses scale universally with the balance of shear and attractive forces.
    • BD simulations revealed attractive forces as the primary origin of internal stresses.
    • Particle dynamics showed sub-diffusive displacements within the attraction range, hindering full structural recovery.

    Conclusions:

    • The interplay between shear and attractive forces dictates residual stress amplitude.
    • Internal stresses in colloidal gels are predominantly driven by attractive inter-particle interactions.
    • Incomplete structural anisotropy erasure during shear cessation leads to persistent internal stresses.