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Related Experiment Videos

Interplay between shear flow and elastic deformations in liquid crystals.

D Marenduzzo1, E Orlandini, J M Yeomans

  • 1Department of Physics, Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, England. davide@thphys.ox.ac.uk

The Journal of Chemical Physics
|July 21, 2004
PubMed
Summary

This study explores liquid crystal shear flow, revealing non-Newtonian velocity profiles and distinct director orientations due to elastic deformations. It also details shear-induced unwinding in cholesterics and affects shear banding in nematics.

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Area of Science:

  • Physics
  • Materials Science

Background:

  • Liquid crystals exhibit complex flow behaviors influenced by elastic deformations.
  • Understanding these behaviors is crucial for advanced material applications.

Purpose of the Study:

  • To investigate shear flow in liquid crystal cells with elastic deformations.
  • To analyze the impact of shear on different liquid crystal phases and structures.

Main Methods:

  • Utilized a lattice Boltzmann scheme to solve the 3D Beris-Edwards equations.
  • Simulated twisted nematic, hybrid aligned nematic, and cholesteric liquid crystal cells.

Main Results:

  • Observed non-Newtonian velocity profiles due to backflow in nematic cells.
  • Identified distinct director orientation regions and secondary flow in cholesterics.

Related Experiment Videos

  • Documented shear-induced unwinding and twist in cholesteric and nematic phases, respectively.

    • Conclusions:

    • Elastic deformations significantly alter shear flow dynamics in liquid crystals.
    • Shear can induce structural transitions like unwinding and twisting.
    • Coupling between shear and elasticity impacts shear banding phenomena.