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Amphiphilic Langmuir-Blodgett Films as a New Tool for Inducing Alignment Transition in Nematics

L. Komitova Physics Department , Chalmers University of Technology , S-41296 , Güteborg , SwedenB. Steblera Physics Department , Chalmers University of Technology , S-41296 , Güteborg , SwedenGabriella Gabriellib Chemistry Department , University of Florence , 1-50121 , Firenze , ItalyM. Puggellib Chemistry Department , University of Florence , 1-50121 , Firenze , ItalyAmelia Carolina Sparavignac Physics Department , Polytechnic of Turin , 1-10129 , Torino , ItalyA. Strigazzic Physics Department , Polytechnic of Turin , 1-10129 , Torino , Italy

Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystalsjournal1994en

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Annotatsiya

Abstract Mono- or multilayers of egg lecithin, distearoylphosphatidylcholine lecithin (DSPC-L), dimiristoyl-phosphatidylcholine lecithin (DMPC-L) and stearic acid (SA) deposited by Langmuir-Blodgett technique were used as aligning films in a nematic liquid crystal cell for obtaining a uniform homeotropic orientation and a temperature driven surface transition close to the clearing point. An excellent homeotropic alignment of the liquid crystal was obtained when a monolayer of DMPC-L, DSPC-L or SA was used. In these cases, a sharp and reversible transition from the homeotropic orientation to a set of circular domains, where the liquid crystal molecules have a degenerate quasi-planar alignment, was observed a few tenths of a degree below the nematic-isotropic phase transition.

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Mavzular

Liquid Crystal Research Advancements Lipid Membrane Structure and Behavior Surfactants and Colloidal Systems

Identifikatorlar

DOI: 10.1080/10587259408037764

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