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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Manuel Greschek1, Martin Schoen

  • 1Stranski-Laboratorium für Physikalische und Theoretische Chemie, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany. manuel.greschek@tu-berlin.de

The Journal of Chemical Physics
|December 2, 2011
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Summary

Prewetting transitions in liquid crystals are influenced by substrate interactions. Degenerate anchoring promotes these transitions by increasing molecular orientational entropy, leading to earlier prewetting compared to monostable anchoring.

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Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Liquid crystals exhibit complex phase behavior at interfaces.
  • Understanding interfacial phenomena like prewetting is crucial for materials design.

Purpose of the Study:

  • To investigate prewetting transitions in a model liquid crystal system.
  • To explore the influence of fluid-substrate attraction range and substrate anchoring on these transitions.

Main Methods:

  • Grand canonical ensemble Monte Carlo simulations were employed.
  • Lennard-Jones potentials modeled liquid crystal interactions.
  • Yukawa potential described fluid-substrate attraction.
  • Analysis of grand-potential density and nematic order parameter.

Main Results:

  • Observed discontinuous prewetting, wetting, and isotropic-nematic phase transitions.
  • Prewetting occurred at lower chemical potentials with degenerate anchoring compared to monostable anchoring.
  • Transition behavior was dependent on fluid-substrate attraction range and anchoring type.

Conclusions:

  • Prewetting transitions are significantly driven by orientational entropy.
  • Degenerate anchoring enhances prewetting due to a greater diversity of molecular configurations.
  • Simulations provide detailed structural insights into the interfacial phases.