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

S. Vetrov; G. M. Zharkova; V. M. Khachaturyan; A. Korets; A. Sadreev; V. F. Shabanov

doi:10.1117/12.230659

19 January 1996 Cholesteric LC orientation in spherical capsules of LC composites containing pyrimidine additives

S. Vetrov, G. M. Zharkova, V. M. Khachaturyan, A. Korets, A. Sadreev, V. F. Shabanov

Proceedings Volume 2731, International Liquid Crystal Workshop on Surface Phenomena; (1996) https://doi.org/10.1117/12.230659
Event: International Liquid Crystal Workshop: Surface Phenomena, 1995, St. Petersburg, Russian Federation

Abstract

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.

Citation Download Citation

S. Vetrov, G. M. Zharkova, V. M. Khachaturyan, A. Korets, A. Sadreev, and V. F. Shabanov "Cholesteric LC orientation in spherical capsules of LC composites containing pyrimidine additives", Proc. SPIE 2731, International Liquid Crystal Workshop on Surface Phenomena, (19 January 1996); https://doi.org/10.1117/12.230659

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