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

• Published in: Soft matter Vol. 7; no. 19; pp. 9043 - 9050
• Main Authors: Iglesias, Wilder, Smith, Timothy J., Basnet, Prem B., Stefanovic, Sharon R., Tschierske, Carsten, Lacks, Daniel J., Jákli, Antal, Mann, Elizabeth K.
• Format: Journal Article
• Language: English
• Published: 01.01.2011
• Subjects: Alignment; Camber; Langmuir-Blodgett films; Liquid crystals; Low pressure; Multilayers; Nematic; Tilt
• ISSN: 1744-683X; 1744-6848
• DOI: 10.1039/c1sm05546a

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.