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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., 2010, 1, 44—54.

Structural Transition in Polymer Dispersed Liquid Crystals Prepared Under Magnetic Field

A. M. Parshin1,2, V. G. Nazarov2, V. A. Gunyakov1,2, V. Ya. Zyryanov1,2,3, V. F. Shabanov1,2,3

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
3M. F. Reshetnev Siberian State Aerospace University
Krasnoyarsk, 660014, 31 Krasnoyarsky rabochy prospect, Russia

The structural transition within the nematic liquid crystal droplets of 4-n-pentyl-4'-cyanobiphenyl (5CB) and 4-n-pentyl-4'-cyanophenyl-cyclohexane (5PCH]) encapsulated in polyvinylbutyral matrix under magnetic field is reviewed. The nematic 5CB droplets formed under magnetic field H* < 4 кOe as well as the 5PCN droplets formed under H* < 5 кOe possess the classical bipolar structure. If H* > 4 kOe, the uniform and radial structures are observed also in ensemble of the 5CB droplets. A tendency to align the bipolar axes along the field is revealed within the 5PCN droplets formed under H* > 5 kOe. The radial structures inside the 5PCN droplets are absent. The spontaneous cyclic transition between the bipolar director configuration and homogenous structure can occur within the droplets in the temperature ranges t = (24 ÷ 34)oС for 5CB as well as t = (32 ÷ 54) oС for 5PCN. Moreover the second variant of structural transition: bipolar configuration – radial one is discussed.

Keywords: polymer dispersed liquid crystal, nematic droplet, director configuration, magnetic field, structural transition

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