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Related Experiment Videos

Large-Scale Bundle Ordering in Sterically Stabilized Latices.

Vermant1, Raynaud, Mewis

  • 1Department of Chemical Engineering, K. U. Leuven, de Croylaan 46, Heverlee, B-3001, Belgium

Journal of Colloid and Interface Science
|March 2, 1999
PubMed
Summary

Flow-induced bundle-like ordering in concentrated colloidal dispersions significantly reduces viscosity and causes thixotropic behavior. This structure, observed in dense systems, is sensitive to interparticle forces and relaxation times.

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Area of Science:

  • Colloid and Surface Science
  • Rheology
  • Soft Matter Physics

Background:

  • Concentrated colloidal dispersions exhibit complex behavior under shear flow.
  • Understanding flow-induced structures is crucial for predicting material properties.

Purpose of the Study:

  • Investigate flow-induced structures in concentrated, sterically stabilized aqueous latices far from equilibrium.
  • Characterize the bundle-like ordering and its relation to rheological properties.

Main Methods:

  • Time-resolved small-angle light scattering (TR-SAXS)
  • Linear conservative dichroism (LCD) measurements
  • Rheological analysis

Main Results:

  • Observed a novel bundle-like ordering at high stress levels, larger than single-particle strings.

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  • This ordering significantly decreased viscosity and induced structural hysteresis.
  • Thixotropic behavior was explained by the presence of this bundle-like phase.

    • Conclusions:

    • Bundle-like ordering is a key phenomenon in dense colloidal systems under shear.
    • This structure impacts rheology, leading to viscosity reduction and thixotropy.
    • Interparticle forces strongly influence the relaxation dynamics of these structures.