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Orientational structures in cholesteric droplets with homeotropic surface anchoring.

Mikhail N Krakhalev1, Vladimir Yu Rudyak2, Oxana O Prishchepa1

  • 1Kirensky Institute of Physics, Federal Research Center - Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russia and Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russia.

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Summary

Cholesteric droplet structures were studied using experiments and simulations. Researchers identified novel toron-like and layer-like structures, explaining their stability based on the helicity parameter and free energy.

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Area of Science:

  • Liquid crystals
  • Materials science
  • Soft matter physics

Background:

  • Cholesteric liquid crystals exhibit unique orientational structures.
  • Surface anchoring conditions significantly influence these structures.
  • Understanding structure formation is crucial for applications.

Purpose of the Study:

  • To investigate the impact of the helicity parameter on orientational structures in cholesteric droplets.
  • To identify and characterize topological defects and director configurations.
  • To map the stability ranges of observed structures.

Main Methods:

  • Experimental studies using polarized microscopy.
  • Computational simulations of liquid crystal behavior.
  • Comparison of experimental textures with simulated results.

Main Results:

  • Observed a sequence of distinct orientational structures.
  • Identified toron-like and low-symmetry intermediate layer-like structures.
  • Detailed analysis of director configurations and topological defects.

Conclusions:

  • The helicity parameter dictates the observed structures in cholesteric droplets.
  • Free energy terms explain the stability of these structures.
  • A comprehensive diagram summarizes structure stability ranges.