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Shear-induced transitions in colloidal and polymeric liquids
1A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29, Leninsky Prospect, 119991 Moscow, Russia.
Advances in Colloid and Interface Science
|February 28, 2021
Summary
Shear-induced transformations in complex liquids create inhomogeneities, leading to phase separation and unique structures like liquid crystals. These phenomena are observed in polymers and dispersions, influenced by flow instabilities.
Area of Science:
- Rheology
- Complex Fluids
- Materials Science
Background:
- Complex liquids exhibit shear-induced structure transformations.
- Understanding these transformations is crucial for material processing and performance.
Purpose of the Study:
- To review current studies on shear-induced structure transformation in complex liquids.
- To discuss experimental data from polymeric liquids and dispersions.
- To analyze the underlying mechanisms and rheological models.
Main Methods:
- Review of experimental data from polymeric liquids (melts, blends, solutions).
- Analysis of data from various dispersions (colloidal solutions, suspensions, emulsions).
- Discussion based on constitutive molecular and phenomenological rheological models.
Main Results:
- Shearing creates inhomogeneities, potentially leading to phase separation.
- Deformation-driven orientation of polymers and micelles induces phase transitions and liquid-crystal states.
- Self-assembly effects and regular structure formation are observed under specific flow conditions.
Conclusions:
- Shear flow significantly alters the structure of complex liquids.
- Flow instabilities and two-value points on flow curves are linked to structure formation.
- Rheological models provide insights into these complex phenomena.
Keywords:
Flow curvesLiquid crystal statePolymersSelf-assemblyShear rateShear-induced phase transitionsSolutionsSuspensionsViscosityWorm-like micellesMore Related Videos
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