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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Spatiotemporal stress and structure evolution in dynamically sheared polymer-like micellar solutions.

A Kate Gurnon1, Carlos R Lopez-Barron, Aaron P R Eberle

  • 1Center for Neutron Science, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE, USA. wagnernj@udel.edu.

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|March 27, 2014
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Researchers developed a new method combining neutron scattering and rheometry to study soft material flow. This reveals complex microstructural changes during shear banding, offering insights into non-equilibrium thermodynamics.

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Area of Science:

  • Soft matter science
  • Non-equilibrium thermodynamics
  • Polymer physics

Background:

  • Understanding the relationship between microstructure and rheology in soft materials is a key challenge.
  • Soft materials exhibit complex, nonlinear flow behaviors crucial for various applications.

Purpose of the Study:

  • To develop a novel experimental method for investigating the spatiotemporal evolution of microstructure in soft materials under shear.
  • To quantitatively connect deformation fields, local microstructure, and macroscopic rheological properties.

Main Methods:

  • Simultaneous application of small-angle neutron scattering (SANS) and nonlinear oscillatory shear rheometry.
  • Investigation of polymer-like micellar (PLM) solutions to probe microstructure dynamics.

Main Results:

  • Demonstrated the ability of nonlinear oscillatory shear methods to create and study metastable material states.
  • Identified a precursory state to shear banding and a low-viscosity, disentangled state with inhomogeneous microstructure at high shear rates.

Conclusions:

  • The study provides new experimental evidence elucidating the complexities of shear banding in complex fluids.
  • The findings offer valuable data for quantitatively testing theories of non-equilibrium soft matter dynamics.