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Related Experiment Videos

Surface extrapolation length and director structures in confined nematics

Priezjev1, Pelcovits

  • 1Department of Physics, Brown University, Providence, Rhode Island 02912, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|December 2, 2000
PubMed
Summary

Simulations reveal cooling rate impacts nematic liquid crystal structures in cylinders. A fast cooling rate prevents planar states, favoring escaped radial structures by overcoming energy barriers and accounting for temperature-dependent surface extrapolation length.

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Area of Science:

  • Physics
  • Materials Science

Background:

  • Nematic liquid crystals exhibit complex behaviors when confined.
  • Elastic theory provides a framework for understanding liquid crystal phases.
  • Surface anchoring conditions significantly influence confined systems.

Purpose of the Study:

  • To investigate the Lebwohl-Lasher model of nematic liquid crystals in cylindrical cavities.
  • To reconcile simulation results with predictions from elastic theory.
  • To understand the role of cooling rate on director structure formation.

Main Methods:

  • Monte Carlo simulations were employed.
  • The Lebwohl-Lasher model was used for nematic liquid crystals.
  • Temperature dependence of the bulk to surface coupling ratio (K/W) was measured.

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Main Results:

  • The ratio of bulk to surface couplings (K/W) is not always equal to the elastic theory parameter.
  • Cooling rate critically affects the final director structure due to free energy barriers.
  • A fast cooling rate promotes escaped radial structures over metastable planar states.

Conclusions:

  • Elastic theory requires careful consideration of temperature-dependent parameters like K/W.
  • Cooling protocols are essential for controlling the final director structure in confined nematic liquid crystals.
  • Escaped radial structures can be achieved by optimizing cooling rates and system size.