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Surface modes at the nematic-isotropic interface.

V Popa-Nita1, T J Sluckin

  • 1Faculty of Physics, University of Bucharest, P.O. Box MG-11, Bucharest 76900, Romania.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 22, 2002
PubMed
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We studied surface modes at the nematic-isotropic interface using generalized dynamical Landau-de Gennes theory. Order parameter relaxation dominates at short wavelengths, while viscous damping is key at long wavelengths.

Area of Science:

  • Soft Matter Physics
  • Liquid Crystals
  • Interface Dynamics

Background:

  • Nematic-isotropic interfaces are crucial in liquid crystal phenomena.
  • Understanding surface modes is key to controlling liquid crystal behavior.
  • Existing theories may not fully capture the dynamics across different length scales.

Purpose of the Study:

  • To investigate surface modes at the nematic-isotropic interface.
  • To analyze the influence of order parameter relaxation and viscous damping.
  • To characterize the crossover between different dynamic regimes.

Main Methods:

  • Application of generalized dynamical Landau-de Gennes theory.
  • Modeling an isothermal, infinite, unbounded nematic-isotropic system.

Related Experiment Videos

  • Derivation and analysis of a generalized dispersion relation.

    • Main Results:

    • Identified distinct behaviors in short and long wavelength limits.
    • Order parameter relaxation dominates at short wavelengths.
    • Viscous damping becomes significant at long wavelengths.

    Conclusions:

    • The study provides a comprehensive analysis of surface modes at the nematic-isotropic interface.
    • It elucidates the transition from relaxation-dominated to damping-dominated regimes.
    • The findings offer insights into the behavior of liquid crystals like 8CB.