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Micro-rheology experiments reveal two shear thinning regimes in worm-like micellar fluids. A novel regime at low Weissenberg numbers suggests unique fluid dynamics and length scales.

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Area of Science:

  • Soft Matter Physics
  • Rheology
  • Colloid Science

Background:

  • Viscoelastic worm-like micellar fluids exhibit complex flow behavior.
  • Macroscopic rheological studies provide insights into bulk fluid properties.
  • Understanding micro-scale fluid dynamics is crucial for complex fluids.

Purpose of the Study:

  • To investigate the micro-rheological behavior of worm-like micellar fluids.
  • To identify and characterize shear thinning regimes at the micro-scale.
  • To compare micro-rheological findings with macroscopic rheological data.

Main Methods:

  • Micro-rheological experiments using a colloidal bead probe.
  • Driving the bead through a viscoelastic worm-like micellar fluid.
  • Analysis of bead motion to determine fluid shear thinning behavior.

Main Results:

  • Observed two distinct shear thinning regimes with Newtonian-like plateaus.
  • Shear thinning at high velocities aligns with macroscopic rheology.
  • A novel shear thinning regime at low Weissenberg numbers (few percent) lacks macroscopic analogs.

Conclusions:

  • The study identifies two shear thinning processes linked to different fluid length scales.
  • A simple model explains observed behavior and oscillations, suggesting micro-shear systems are far from equilibrium.
  • Evidence suggests a micro-scale length (few micrometers) influencing fluid dynamics, though its nature is undetermined.