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.
Amphiphilic Langmuir-Blodgett films as a new tool for inducing alignment transition in nematics / L., Komitov; B., Stebler; G., Gabrielli; M., Puggelli; Sparavigna, Amelia Carolina; Strigazzi, Alfredo. - In: MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY. SECTION A, MOLECULAR CRYSTALS AND LIQUID CRYSTALS. - ISSN 1058-725X. - 243:1(1994), pp. 107-124. [10.1080/10587259408037764]
Amphiphilic Langmuir-Blodgett films as a new tool for inducing alignment transition in nematics
SPARAVIGNA, Amelia Carolina;STRIGAZZI, Alfredo
1994
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.Pubblicazioni consigliate
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https://hdl.handle.net/11583/1406010
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