Cholesteric LC orientation in spherical capsules of LC composites containing pyrimidine additives

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Год издания: 1996

Ключевые слова: Additives, Droplets, Helix pitch, Near surface potentials, Pyrimidine, Reflection spectra, Spherical capsules, Composite materials, Crystal orientation, Spectrum analysis, Thermal effects, Thermodynamics, Cholesteric liquid crystals

Аннотация: The reflection spectra of cholesteric liquid crystals dispersed in polymer and comprising pyrimidine dopes are investigated in the entire temperature range of the mesophase existence. One or several oxyphenyl substituents in an ortho position implemented into a pyrimidine system induce the second reflection region. The reflection curves for different wavelengths corresponding to regions I and II merge with temperature. Thermodynamically equilibrium states of polymer-dispersed cholesterics under the influence of polar pyrimidine dopes are considered. The pyrimidine effect is modulated by the orientational near-surface potential. The existence of two space regions of a spherical droplet with different helix pitches is validated. The natural helix pitch is retained inside the droplet while a new pyrimidine-induced pitch is formed in a layer close to the droplet surface. The results obtained describe the existence of two reflection regions and the temperature behavior of the helix pitch.

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Издание

Журнал: Proceedings of SPIE - The International Society for Optical Engineering

Выпуск журнала: Vol. 2731

Номера страниц: 186-190

Авторы

  • Vetrov S. (State Technical Univ., Krasnoyarsk, Russia, Russian Federation)
  • Zharkova G. (State Technical Univ., Krasnoyarsk, Russia, Russian Federation)
  • Khachaturyan V. (State Technical Univ., Krasnoyarsk, Russia, Russian Federation)
  • Korets A. (State Technical Univ., Krasnoyarsk, Russia, Russian Federation)
  • Sadreev A. (State Technical Univ., Krasnoyarsk, Russia, Russian Federation)
  • Shabanov V.F. (State Technical Univ., Krasnoyarsk, Russia, Russian Federation)

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