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Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Large-Scale Bundle Ordering in Sterically Stabilized Latices
1Department of Chemical Engineering, K. U. Leuven, de Croylaan 46, Heverlee, B-3001, Belgium
Journal of Colloid and Interface Science
|March 2, 1999
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.
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.
- 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.
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