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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Microstructural Rearrangements and their Rheological Implications in a Model Thixotropic Elastoviscoplastic Fluid
Safa Jamali1, Gareth H McKinley2, Robert C Armstrong1
1Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|February 11, 2017
Summary
This study reveals how attractive particulate gels change microstructurally under flow, linking these changes to macroscopic properties like shear stress and strain-hardening. Understanding these microstructural dynamics is key to predicting gel behavior.
Area of Science:
- Materials Science
- Rheology
- Soft Matter Physics
Background:
- Attractive particulate gels exhibit complex rheological behavior under shear flow.
- Understanding the microstructural evolution is crucial for predicting macroscopic properties.
Purpose of the Study:
- To identify the sequence of microstructural changes in attractive particulate gels during shear flow.
- To correlate these microstructural changes with macroscopic rheological properties.
Main Methods:
- Utilized dissipative particle dynamics simulations.
- Monitored shear-driven evolution of a fabric tensor.
- Decomposed the fabric tensor into isotropic and nonisotropic components.
Main Results:
- The average coordination number directly correlates with the shear stress versus shear rate flow curve.
- Nonisotropic local particle rearrangements drive stress overshoots and strain-hardening.
- Microstructural localization, including shear banding, occurs at larger times and scales.
Conclusions:
- Established a link between microstructural evolution and macroscopic rheology in attractive particulate gels.
- Demonstrated the role of local particle rearrangements in flow-induced phenomena.
- Provided insights into shear banding and flow-induced structure formation.
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