Bipolar-homogeneous structural phase transition in nematic droplets formed in the polymer matrix in a magnetic field

Тип публикации: статья из журнала

Год издания: 2009

Идентификатор DOI: 10.1134/S1063774509070098

Ключевые слова: Bipolar configuration, Bipolar structure, Cyanobiphenyls, Homogeneous structure, Mutual transformations, Nematic director, Nematic droplets, Order parameter, Poly(vinyl butyral), Structural phase transition, Temperature range, Thermal fluctuations, Crystal structure, Drop formation, Liquid crystals, Magnetic fields, Nematic liquid crystals, Phase transitions

Аннотация: The phase transition from the bipolar structure to the homogeneous structure in droplets formed from the nematic liquid crystal 4-n-pentyl-4'-cyanobiphenyl in poly(vinyl butyral) in the presence of a magnetic field has been investigated. The phase transition is associated with the expansion of the regions with a tilted orientation of the director in the vicinity of defects (the disappearance of boojums) and with the alignment of the nematic director lines in the bulk of the droplet in the direction of the magnetic field. In the temperature range T = 24-34A degrees C, cyclic mutual transformations between the bipolar configuration of the nematic director and the homogeneous structure, which have a period of similar to 0.5-3.5 s and result from thermal fluctuations of the order parameter, are observed in droplets 3-15 A mu m in size after the forming field is switched off.

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Издание

Журнал: CRYSTALLOGRAPHY REPORTS

Выпуск журнала: Vol. 54, Is. 7

Номера страниц: 1191-1196

ISSN журнала: 10637745

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Parshin A.M. (Krasnoyarsk Scientific Center,Kirensky Institute of Physics,Russian Academy of Sciences)
  • Zyryanov V.Y. (Krasnoyarsk Scientific Center,Kirensky Institute of Physics,Russian Academy of Sciences)
  • Shabanov V.F. (Krasnoyarsk Scientific Center,Kirensky Institute of Physics,Russian Academy of Sciences)
  • Nazarov V.G. (Siberian Federal University)

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