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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Active microrheology of smectic membranes.

Zhiyuan Qi1,2, Kyle Ferguson1,2, Yancey Sechrest1

  • 1Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.

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Researchers studied fluid membrane hydrodynamics using active microrheology. They observed unexpected flow fields, attributing the discrepancy to air coupling with the membrane.

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Area of Science:

  • Fluid dynamics
  • Soft matter physics
  • Materials science

Background:

  • Thin fluid membranes are crucial models for quasi-two-dimensional fluids and biological membranes.
  • Understanding their hydrodynamic behavior is essential for various scientific and engineering applications.

Purpose of the Study:

  • To investigate the hydrodynamics of thin fluid membranes using active microrheology.
  • To analyze the flow fields generated by an oscillating post within a liquid crystal film.

Main Methods:

  • Active microrheology was employed using small tracer particles.
  • An oscillating rigid post was inserted into a freely suspended smectic liquid crystal film surrounded by air.
  • Velocities were measured at varying distances from the post's meniscus.

Main Results:

  • Highly anisotropic flow fields were observed around the oscillating post.
  • Measured velocities exceeded predictions from models of a finite-extent disklike inclusion.
  • A discrepancy was noted at distances beyond a few Saffman lengths from the meniscus.

Conclusions:

  • The observed flow discrepancy is attributed to the coupling between the fluid membrane and the displaced air.
  • This interaction significantly influences the hydrodynamics of thin fluid membranes in air.