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Alignment by Langmuir/Schaefer Monolayers of Bent-Core Liquid Crystals
Soft Matter (2011)
  • Wilder Iglesias, Kent State University - Kent Campus
  • Timothy J. Smith
  • Prem B. Basnet, Kent State University - Kent Campus
  • Sharon R. Stefanovic, Kent State University - Kent Campus
  • Carsten Tschierske
  • Daniel J. Lacks
  • Antal Jakli, Kent State University - Kent Campus
  • Elizabeth K. Mann

Langmuir films of bent-core molecules at the air/water interface are transferred onto a solid surface by the inverse-Langmuir-Schaefer (ILS) technique. Previous work by the authors demonstrated that ILS films of a symmetric bent-core molecule can serve as effective planar alignment layers for a nematic bent-core liquid crystal cell, but the Langmuir films were unstable and formed multilayers at very low pressures. Here, films of bent-core molecules with one hydrophilic end connected to the bent core by a short aliphatic chain are tested as alignment layers. The hydrophilic group led to much more stable Langmuir films, and also to a molecular tilt at the surface which could be controlled by molecular area. This interpretation of the molecular behavior was supported by a combination of atomically accurate molecular dynamics simulations of up to 36 bent core molecules at a water surface and by the continuous variation of tilt induced by ILS films in a rod-like liquid crystal cell. The ILS films were then tested as alignment layers for a bent-core nematic: highly-compressed films induced perpendicular alignment, which provides a significant step towards their practical application.

  • Langmuir-Blodgett-Films,
  • Banana-Shaped Compounds,
  • Molecular-Dynamics,
  • Optical-Properties,
  • Achiral Molecules,
  • Brewster-Angle,
  • Smectic Phase,
  • Water-Surface,
  • Systems,
  • Visualization
Publication Date
August 11, 2011
Publisher Statement
Available on publisher's site at
Citation Information
Wilder Iglesias, Timothy J. Smith, Prem B. Basnet, Sharon R. Stefanovic, et al.. "Alignment by Langmuir/Schaefer Monolayers of Bent-Core Liquid Crystals" Soft Matter Vol. 7 Iss. 19 (2011)
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