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Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering

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X-ray photon correlation spectroscopy during homogenous shear flow.

Wesley R Burghardt¹, Marcin Sikorski, Alec R Sandy

¹Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, USA. w-burghardt@northwestern.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 3, 2012

Summary

We used x-ray photon correlation spectroscopy to study colloidal particle dynamics under shear flow. Shear flow significantly impacts particle movement, but specific measurement directions allow for the study of diffusion.

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Area of Science:

Soft matter physics
Colloidal science
Rheology

Background:

Understanding particle dynamics in flowing systems is crucial for various applications.
Homogeneous shear flow significantly alters the behavior of colloidal dispersions.
X-ray photon correlation spectroscopy (XPCS) is a powerful tool for probing dynamics at the nanoscale.

Purpose of the Study:

To investigate advective and diffusive dynamics of colloidal particles under homogeneous shear flow.
To quantify the impact of shear flow on particle motion using XPCS.
To develop theoretical models for predicting correlation functions under shear.

Main Methods:

Utilizing x-ray photon correlation spectroscopy (XPCS) with homodyne detection.
Employing a rotating-disk shear cell to apply homogeneous shear flow to colloidal dispersions.
Analyzing intensity autocorrelation functions from scattering data.

Main Results:

Intensity autocorrelation functions are sensitive to velocity variations across the scattering volume when the scattering vector is parallel to the flow.
Theoretical models quantitatively predict the dependence of correlation functions on scattering vector and shear rate.
Shear deformation typically dominates the decay of the intensity correlation function.

Conclusions:

XPCS measurements can effectively probe advective and diffusive dynamics in sheared colloidal systems.
Specific measurement geometries (perpendicular to flow) allow for diffusion studies below a critical shear rate.
Careful consideration of scattering geometry and shear rate is necessary to isolate diffusive dynamics from shear effects.