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Article
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
Abstract

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.

Keywords
  • Langmuir-Blodgett-Films,
  • Banana-Shaped Compounds,
  • Molecular-Dynamics,
  • Optical-Properties,
  • Achiral Molecules,
  • Brewster-Angle,
  • Smectic Phase,
  • Water-Surface,
  • Systems,
  • Visualization
Disciplines
Publication Date
August 11, 2011
Publisher Statement
Available on publisher's site at http://dx.doi.org/10.1039/c1sm05546a
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)
Available at: http://works.bepress.com/antal_jakli/33/