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Quantifying Cytoskeleton Dynamics Using Differential Dynamic Microscopy
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Characterising shear-induced dynamics in flowing complex fluids using differential dynamic microscopy.

James A Richards1, Vincent A Martinez1, Jochen Arlt1

  • 1Edinburgh Complex Fluids Partnership and School of Physics and Astronomy, James Clerk Maxwell Building, Peter Guthrie Tait Road, King's Buildings, Edinburgh, EH9 3FD, UK. james.a.richards@ed.ac.uk.

Soft Matter
|September 24, 2021
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Summary
This summary is machine-generated.

This study uses differential dynamic microscopy (DDM) to observe complex fluid yielding without particle tracking. It reveals yielding occurs in two steps: droplet mobilization and then shear localization, offering insights into material behavior.

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Area of Science:

  • Rheology
  • Soft Matter Physics
  • Complex Fluids

Background:

  • Understanding the bulk rheological response of complex fluids is crucial for industrial applications.
  • Directly observing microscopic dynamics in concentrated, industrially relevant samples is often challenging.
  • Differential Dynamic Microscopy (DDM) offers a particle-resolution-free approach to study fluid dynamics.

Purpose of the Study:

  • To adapt and apply Differential Dynamic Microscopy (DDM) to characterize the yielding behavior of highly concentrated complex fluids under flow.
  • To correlate microscopic dynamics with macroscopic rheological properties during yielding.
  • To investigate the yielding mechanism of a silicone oil emulsion using both oscillatory and steady shear flow.

Main Methods:

  • Adaptation of Differential Dynamic Microscopy (DDM) for flowing, highly concentrated samples without requiring particle resolution.
  • Utilizing a novel
  • echo-DDM
  • analysis for oscillatory flow investigations.
  • Employing
  • flow-DDM
  • for steady shear flow characterization.
  • Combining microscopic observations with bulk rheological measurements.

Main Results:

  • The study successfully characterized the yielding of a silicone oil emulsion at both microscopic and bulk levels.
  • Two distinct steps were identified in the transition from solid-like to liquid-like behavior: droplet mobilization and subsequent shear localization.
  • Droplet mobilization was linked to the limit of linear visco-elasticity, preceding macroscopic yielding.

Conclusions:

  • The developed DDM techniques provide valuable insights into the yielding mechanisms of challenging complex fluids.
  • Microscopic dynamics, specifically shear-induced droplet rearrangements and flow velocity, are key indicators of yielding.
  • This approach enables a deeper understanding of complex fluid behavior under various flow conditions.