Molecular organization in two-dimensional films of liquid crystalline mixtures III. Langmuir films of binary mixtures of liquid crystal materials with terminal CN o r NCS group |
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Authors: | Tomasz Martynski Robert Hertmanowski Danuta Bauman |
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Affiliation: | 1. Departamento de Física , Universidade Estadual de Londrina , Campus Universitário , 86051‐990 ‐ Londrina, Paraná, Brazil;2. Departamento de Física , Universidade Estadual de Maringá Avenida Colombo , 5790 ‐ 87020‐900 ‐ Maringá, Paraná, Brazil |
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Abstract: | Langmuir films of binary mixtures of the following liquid crystal materials: 4-octyl-4′-cyanobiphenyl (8CB) or 4-pentyl-4″-cyano-p-terphenyl (5CT) with 4-(trans-4'-octylcyclohexyl)isothiocyanatobenzene (8CHBT), trans-4-octyl(4′-cyanophenyl)cyclohexane (8PCH) or 4-octyl4′-isothiocyanatobiphenyl (8BT) were investigated. Surface pressure-mean molecular area isotherms were recorded at various mixture compositions. It was found that only liquid crystal materials for which the molecules have a terminal -CN group are able to form a stable monolayer at the air-water interface. Moreover, information about the miscibility or the phase separation of the two components in the mixures was obtained by using the excess area criterion and surface phase rules. |
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Keywords: | blue phase liquid crystal oxadiazole |
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