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Flow dichroism in critical colloidal fluids.

T A Lenstra1, J K Dhont

  • 1Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 21, 2001
PubMed
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Shear flow distorts near-critical fluid microstructure, causing dichroism. Experiments show unexpected dichroism decrease near the critical point, unlike turbidity, challenging current theories.

Area of Science:

  • Soft Matter Physics
  • Fluid Dynamics
  • Colloid Science

Background:

  • Near-critical fluids exhibit long-range correlations and slow dynamics.
  • Shear flow induces anisotropy in fluid microstructure, leading to observable dichroism.
  • Dichroic behavior serves as a probe for microstructural ordering under shear.

Purpose of the Study:

  • To investigate the dichroic behavior of a colloid-polymer mixture under shear flow.
  • To compare experimental results with theoretical predictions in different regions relative to the critical point.
  • To explore phenomena beyond the mean-field region where existing theories are insufficient.

Main Methods:

  • Static and dynamic dichroism measurements.
  • Turbidity measurements.

Related Experiment Videos

  • Utilized a colloid-polymer mixture (silica spheres and polydimethylsiloxane).

    • Main Results:

    • Experimental data agreed with theory in the mean-field region, far from the critical point.
    • Observed an unexpected decrease in dichroism upon approaching the critical point, in the non-mean-field region.
    • Critical slowing down of shear-induced dichroism was not observed, contrasting with turbidity measurements.

    Conclusions:

    • Current theories adequately describe dichroism in the mean-field region.
    • The behavior of dichroism very close to the critical point deviates from predictions and requires new theoretical frameworks.
    • The absence of critical slowing down in shear-induced dichroism highlights unique dynamics near the critical point.