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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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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2015, 15 (1), 81—90. |
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Sorption Redistribution of Hydrocarbons and Alcohols in the Gas – Supramolecular Liquid Crystal 4-(2-Hydroxyethyloxy)-4'-Cyanoazoxybenzene System
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D. A. Tugareva1, L. A. Onuchak1, T. S. Kapralova1, Yu. G. Kuraeva1, S. A. Kuvshinova2, V. A. Burmistrov2
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Author affiliations
1Samara State University,
1 Ak. Pavlov St., Samara, 443011, Russia
E-mail: onuchak@samsu.ru
2Ivanovo State University of Chemistry and Technology,
7 Sheremetevsky Ave., Ivanovo, 153000, Russia
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Abstract
The method of inverse gas chromatography was used to study the thermodynamic characteristics of the sorption redistribution of hydrocarbons (n-alkanes С10–С14, terpenes С10Н16, xylene isomers) and alcohols (alkanols and izo-alkanols С4–С7) in the gas – supramolecular nematic liquid crystal 4-(2-hydroxyethoxy)-4'-cyanoazoxybenzene (HEOCAB) system. It was established that the synthesized HEOCAB is a mixture of isomers with different melting points. Low-temperature mixed nematic phase contains solid particles inclusions in the range 113–135 °C and possesses a high selectivity towards para- and meta-xylene (αp/m = 1,164, 115 °C). In the high-homogeneous nematic phase (135–175 °C) the values of αp/m decrease sharply due to the reduced degree of association of the mesogenic molecules and fall of the order parameter.
Keywords: supramolecular liquid crystal, nonmesogenic substance, thermodynamics of sorption, gas-liquid chromatography, selectivity
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