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    Alignment by Langmuir/Schaefer monolayers of bent-core liquid crystals

    Year: 2011

    Journal: Soft Matter, 2011, 7 (19), 9043-9050, 20131009

    Authors: Wilder Iglesias, Timothy J. Smith, Prem B. Basnet, Sharon R. Stefanovic, Carsten Tschierske, Daniel J. Lacks, Antal Jákli, Elizabeth K. Mann

    Organizations: Liquid Crystal Institute, Kent State University, Kent, USA; Chemical Engineering, Case Western Reserve University, Cleveland, USA; Physics Department, Kent State University, Kent, USA; Institute of Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Halle, Germany

    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.