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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2008, 3, 39—44.
Photoinduced Phase Transition Smectic A – Cholesteric in Liquid Crystal Matrices Containing Provitamin D
L. N. Zavora1, N. A. Kasyan1, L. N. Lisetski1, V. D. Panikarskaya1, I. P. Terenetskaya2,
T. N. Orlova2, S. I. Torgova3
Author affiliations 1SSI “Institute for Single Crystals”. NAS of Ukraine. 60 Lenin Ave, Kharkov, 61001, Ukraine. email@example.com
2Institute of Physics. Nauky av. 46, Kyiv 680028, Ukraine
3Institute of Physics RAS, 123995, GSP-5, Moscow D-242, B. Gruzinskaya st., 10-1, Russia
Abstract UV-irradiation of liquid crystal mixtures based on cholesterol esters, which contain provitamin D as a non-mesogenic component and form, alongside with the cholesteric phase, smectic A-phase at lower temperatures, can lead to a photoinduced smectic A – cholesteric transition, with a corresponding appearance of visible color upon absorption of a certain dose of UV radiation. The presence of a biological component (provitamin D) makes this system a promising material for bioequivalent UV-dosimetry. Physico-chemical principles governing the process are discussed, which determine the effects of the mixture composition on the sensitivity of the sensor material.