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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Rus Eng


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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2009, 3, 80—88.

Magnetic Field Influence on an Alignment of Nematic onto Polymer Surface

A. M. Parshin1,2, V. A. Gunyakov1,2, V. Ya. Zyryanov1,3, V. F. Shabanov1,3

Author affiliations
1Kirensky Institute of Physics, Krasnoyarsk Scientific Centre, SB RAS
Krasnoyarsk 660036, Akademgorodok 50, Russia. 
2Siberian Federal University,
Krasnoyarsk 660041, 79 Svobodny prospect, Russia
3Siberian State Aerospace University
Krasnoyarsk, 660014, 31 Krasnoyarsky rabochy prospect, Russia

The interaction of a 4-n-pentyl-4'-cyanobiphenyl nematic liquid crystal with a polyvinyl butyral surface, cured with phase separation under magnetic field was investigated. From the measurement of polarized components of optical transmission of nematic matrix doped by dichroic dye the azimuthal cohesion energy of liquid crystal with polymer surface was obtained. From the threshold field of the Freedericksz transition the polar cohesion energy was found. This parameter is at least twice higher than the azimuthal one. The analysis of molecular interaction liquid crystal – polymer showed that azimuthal cohesion of nematics is due to the short-range inductive polar forces while the long-range dispersive forces are responsible for their polar cohesion with the polymer surface.

Keywords: nematic liquid crystal, polymer film, cohesion energy, Freedericksz transition, magnetic field

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