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Interparticle attraction controls flow heterogeneity in calcite gels
Teresa Liberto1, Marie Le Merrer2, Sébastien Manneville3
1Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, Villeurbanne, France. catherine.barentin@univ-lyon1.fr and Institute of Materials Technology, Building Physics and Construction Ecology, Faculty of Civil Engineering, Vienna University of Technology, Karlsplatz 13, 1040 Vienna, Austria.
Soft Matter
|September 14, 2020
Summary
Researchers linked attractive forces in colloidal gels to shear bands and stress fluctuations for the first time. This study advances understanding of gel flow behavior and particle interactions.
Area of Science:
- Colloid and Interface Science
- Rheology
- Soft Matter Physics
Background:
- Colloidal gels exhibit complex flow behaviors.
- Understanding the relationship between interparticle forces and macroscopic properties is crucial.
Purpose of the Study:
- To investigate the flow behavior of colloidal calcite gels.
- To establish a direct link between attractive interparticle forces and shear banding.
- To explore stress fluctuations in colloidal gels.
Main Methods:
- Coupling of rheometry and ultrasonic velocimetry for simultaneous measurements.
- Experimental study of calcite particle gels in water.
- Tuning interparticle attraction strength via physico-chemical methods.
Main Results:
- Demonstrated a direct connection between attractive interactions and shear band formation in colloidal gels.
- Observed and characterized stress fluctuations correlated with attractive forces.
- Provided the first experimental evidence of this link in colloidal gels.
Conclusions:
- Attractive interparticle forces are a key determinant of shear banding in colloidal gels.
- The findings offer new insights into the microrheology and yielding of soft materials.
- This work paves the way for controlling gel properties through interparticle interactions.
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