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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Rus Eng


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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2017, 17 (4), 67—72.
DOI: 10.18083/LCAppl.2017.4.67

Dynamic and Static Light Scattering at Phase Transitions in Liquid Crystal Confined Into Porous Polymer Film

S. V. Pasechnik1, G. I. Maksimochkin1, D. V. Shmeliova1, A. O. Zhirkov2, S. Kralj3, O. A. Semina1

Author affiliations
1Problem Laboratory of Molecular Acoustics, Moscow Technological University,
20 Sromynka St., Moscow, 107996, Russia
2Laboratory of ultra-high-speed optoelectronics and information processing, Lebedev Physical Institute,
53 Leninsky Pr., Moscow, 119991, Russia
3Faculty of Natural Sciences and Mathematics, University of Maribor,
160 Koroska, Maribor 2000, Slovenia

Autocorrelation function g2(τ) and intensity (I) of the depolarized scattered light were obtained at the study of a dynamic light scattering from the composite liquid crystal (LC) material, consisting of porous polyethylenterephthalate (PET) film filled with oсtylcyanobiphenyl (8CB). The simultaneous analysis of these parameters made possible to extract the temperatures TIN and TNA of the isotropic liquid – nematic (N–I) and nematic – smectic A (N-SmA) phase transitions in LC samples confined into cylindrical pores of diameters in the range of 0.02 … 2 μm. The dependences of TIN and TNA on the pore diameter were obtained and compared with the theoretical predictions. It was shown that simultaneous investigations of dynamic and static light scattering can be considered as a perspective approach for a study of phase transitions in LCs at strong confinement, which is typical for composite LC materials.

Keywords: liquid crystals, porous films, phase transitions, dynamic light scattering, static light scattering

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