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Elastic flow instability in nanotube suspensions
S Lin-Gibson1, J A Pathak, E A Grulke
1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Physical Review Letters
|March 6, 2004
Summary
Flow-induced clustering in colloidal nanotubes causes an elastic instability. This phenomenon, observed in complex fluids, relates to the formation of elastic aggregates aligned with flow.
Area of Science:
- Colloidal science
- Fluid dynamics
- Materials science
Background:
- Non-Brownian colloidal suspensions exhibit complex flow behaviors.
- Understanding flow-induced structures is crucial for predicting material properties.
Purpose of the Study:
- To investigate the elastic instability in semidilute non-Brownian colloidal nanotubes.
- To correlate rheological properties with structural evolution under shear.
Main Methods:
- Rheo-optical measurements were employed to study the suspension.
- Simulations of mechanical flocculation in sheared fiber suspensions were conducted.
- Structural evolution was characterized based on confinement and shear stress.
Main Results:
- Flow-induced clustering leads to a significant elastic instability.
- Transient rheology is directly linked to the formation of elastic vorticity-aligned aggregates.
- The observed instability is prevalent in various complex fluid systems.
Conclusions:
- Elastic instability is a key feature of flow-induced clustering in these nanotube suspensions.
- The findings provide insights into the behavior of complex fluids under shear.
- This study highlights the importance of structural evolution in determining fluid elasticity.