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Updated: Dec 9, 2025
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Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering
Published on: February 6, 2014
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Highly anisotropic vorticity aligned structures in a shear thickening attractive colloidal system
Chinedum O Osuji1, David A Weitz2
1Department of Chemical Engineering, Yale University, New Haven, CT 06511, USA. chinedum.osuji@yale.edu.
Soft Matter
|September 10, 2020
Summary
Carbon black particles form cylindrical flocs in steady flow. These structures also appear transiently in gels after high shear rate flows, revealing new insights into material behavior.
Area of Science:
- Rheology
- Colloid Science
- Materials Science
Background:
- Carbon black particles are widely used in various industrial applications.
- Understanding particle behavior in complex fluids is crucial for material design.
- Shear thickening fluids exhibit a dramatic increase in viscosity under shear stress.
Purpose of the Study:
- To investigate the formation and behavior of carbon black particle structures in different flow conditions.
- To explore the role of vorticity in particle assembly.
- To understand the transient structures formed in shear-thickened gels.
Main Methods:
- Steady flow rheometry at low shear rates.
- Analysis of transient structures in quenched shear-thickened gels.
- Microscopy and particle imaging techniques (implied).
Main Results:
- Vorticity-aligned cylindrical flocs of carbon black particles are formed under steady flow at low shear rates.
- These cylindrical structures appear as transient features in the flow response of gels.
- The formation of these structures is linked to the quenching of high rate shear thickening flows.
Conclusions:
- Carbon black particle organization into vorticity-aligned cylinders is a key phenomenon in both steady and transient flow conditions.
- The study reveals a connection between low shear rate floc formation and the dynamics of shear-thickened gels.
- These findings contribute to a deeper understanding of microstructure evolution in concentrated colloidal systems.
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