Effects of UV Radiation on Helical Twisting in Cholesteric Systems Containing Photosensitive Azoxy Nematics

M.I. Serbina; N.A. Kasian; L.N. Lisetski

doi:10.15407/ujpe57.2.235

Effects of UV Radiation on Helical Twisting in Cholesteric Systems Containing Photosensitive Azoxy Nematics

Authors

M.I. Serbina Institute for Scintillation Materials, Nat. Acad. of Sci of Ukraine
N.A. Kasian Institute for Scintillation Materials, Nat. Acad. of Sci. of Ukraine
L.N. Lisetski Institute for Scintillation Materials, Nat. Acad. of Sci. of Ukraine

DOI:

https://doi.org/10.15407/ujpe57.2.235

Keywords:

Abstract

For cholesteric liquid crystal systems containing photosensitive nematic ZhK-440 and a mixture of cholesterol derivatives, the changes in helical twisting induced by UV radiation are studied. The UV-induced shift of the selective reflection maximum λ_maxis shown to depend on the concentration of the nematic component. For low concentrations of ZhK-440, λ_max increases, which correlates with the corresponding temperature-induced changes. For higher azoxy nematic concentrations, λ_max decreases, regardless of the temperature behavior of the system. To explain the experimental data, a theoretical description is proposed on the basis of the development of molecular models of helical twisting. Good agreement was obtained between calculated and measured values of the UV-induced shift as a function of the azoxy nematic concentration, with two extrema and an inversion point. The extra twisting arises from the cholesteric mesophase-induced orientation of short molecular axes of cis-isomers formed as a result of irradiation.

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Published

2012-02-15

How to Cite

Serbina, M., Kasian, N., & Lisetski, L. (2012). Effects of UV Radiation on Helical Twisting in Cholesteric Systems Containing Photosensitive Azoxy Nematics. Ukrainian Journal of Physics, 57(2), 235. https://doi.org/10.15407/ujpe57.2.235

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Issue

Vol. 57 No. 2 (2012)

Section

Atoms and molecules

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