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Helical twisting in nemato-cholesteric systems based on cholesterol derivatives and photosensitive azoxy compounds

  • Liquid Crystals
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Abstract

For cholesteric liquid crystal systems containing photosensitive nematic ZhK-440 and a mixture of cholesterol derivatives, changes in helical twisting induced by UV radiation were studied. The UV-induced shift of selective reflection maximum λmax was shown to depend upon concentration of the nematic component. For low concentrations of ZhK-440, λmax increases, which correlates with corresponding changes with increasing temperature. For higher concentrations, λmax decreases, regardless of the temperature behavior of the system. A theoretical description of the available experimental data is proposed on the basis of development of molecular models of helical twisting, including an assumed possibility of ordered orientation of short molecular axes of cis-isomers formed as a result of UV irradiation, which is determined by the sense of the cholesteric helix already present in the system.

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Authors and Affiliations

  1. Institute for Scintillation Materials, STC “Institute for Single Crystals”, NAS of Ukraine, Kharkov, Ukraine

    M. I. Serbina, N. A. Kasian & L. N. Lisetski

Authors
  1. M. I. Serbina
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  2. N. A. Kasian
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  3. L. N. Lisetski
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Correspondence to L. N. Lisetski.

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Original Russian Text © M.I. Serbina, N.A. Kasian, L.N. Lisetski, 2013, published in Kristallografiya, 2013, Vol. 58, No. 1, pp. 140–145.

The article is translated by the authors.

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Serbina, M.I., Kasian, N.A. & Lisetski, L.N. Helical twisting in nemato-cholesteric systems based on cholesterol derivatives and photosensitive azoxy compounds. Crystallogr. Rep. 58, 155–159 (2013). https://doi.org/10.1134/S1063774512060119

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  • DOI: https://doi.org/10.1134/S1063774512060119

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