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Related Experiment Video

Updated: May 2, 2026

Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering
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Measuring material microstructure under flow using 1-2 plane flow-small angle neutron scattering.

A Kate Gurnon1, P Douglas Godfrin1, Norman J Wagner2

  • 1Center for Neutron Science, Department of Chemical and Biomolecular Engineering, University of Delaware.

Journal of Visualized Experiments : Jove
|February 25, 2014
PubMed
Summary
This summary is machine-generated.

A novel small-angle neutron scattering (SANS) shear cell enables detailed microstructure analysis of complex fluids under shear flow. This advancement allows for studying flow instabilities like shear banding with unprecedented spatial and temporal resolution.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Neutron Scattering Techniques

Background:

  • Studying complex fluids under shear flow is crucial for understanding their rheology and microstructure.
  • Existing sample environments have limitations in resolving microstructural changes during shear.

Purpose of the Study:

  • To present a new small-angle neutron scattering (SANS) sample environment optimized for complex fluids under simple shear flow.
  • To enable detailed investigation of microstructural evolution and flow instabilities.

Main Methods:

  • A sealed, rotating concentric cylinder Couette geometry aligned with the neutron beam.
  • Utilizing a narrow neutron beam aperture for spatially resolved measurements along the velocity gradient.
  • Time-resolved detection synchronized with shear motion for dynamic experiments.

Main Results:

  • Demonstrated the capability to study shear banding in wormlike micelle solutions.
  • Highlighted the importance of spatial resolution for investigating phenomena in the 1-2 plane of shear.
  • Showcased the potential for time-resolved experiments like flow start-up and oscillatory shear.

Conclusions:

  • The developed SANS shear cell is a valuable tool for probing complex fluid microstructures under flow.
  • The design facilitates the study of flow instabilities and dynamic processes.
  • Future improvements and supplementary experiments are proposed for broader applications.