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Surface ordering transitions at a liquid crystal-solid interface above the isotropic smectic-A transition.

T Jin1, G P Crawford, R J Crawford

  • 1Department of Physics, Kent State University, Kent, Ohio 44242, USA.

Physical Review Letters
|February 7, 2003
PubMed
Summary

Surface confinement influences liquid crystal orientational order, depending on surfactant length and surface coverage. These findings are explained by a model of surface-induced layering and molecular diffusion.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Soft Matter Physics

Background:

  • Confining surfaces can induce orientational order in liquid crystals above phase transitions.
  • Understanding surface-induced effects is crucial for designing advanced materials and devices.

Purpose of the Study:

  • To quantify the orientational order induced by cylindrical surfaces in liquid crystals.
  • To investigate the dependence of this order on molecular and surface parameters.
  • To explain observed order transitions using a theoretical model.

Main Methods:

  • Deuteron nuclear magnetic resonance (NMR) spectroscopy was used to monitor linesplitting and linewidth.
  • Measurements were conducted above the smectic-A to isotropic phase transition.
  • A simplified model incorporating surface-induced layering and molecular self-diffusion was employed.

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Main Results:

  • Orientational order was found to be strongly dependent on surfactant coupling molecule length and surface coverage.
  • The type of liquid crystal also significantly influenced the degree of orientational order.
  • Continuous and stepwise growth of orientational order, along with surface-induced transitions in the isotropic phase, were observed.

Conclusions:

  • Surface confinement plays a critical role in dictating liquid crystal orientational order.
  • The observed phenomena can be effectively explained by a model considering surface-induced layering and molecular diffusion.
  • This research provides insights into the fundamental interactions at liquid crystal-surface interfaces.