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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., 2010, 1, 68—78.





Adsorption of Organic Substances on Carbon Blacks, Modified by Monolayers of Polar Anisometric Molecules



S. Yu. Kudryashov, M. Yu. Pavlov, K. A. Kopytin, L. A. Onuchak

Author affiliations
Samara State University, Department of general chemistry and chromatography
443011 Samara, street of Academician Pavlova, 1
E-mail: kstasu@mail.ru,
onuchak@ssu.samara.ru

Abstract
Thermodynamic characteristics of adsorption of organic compounds on carbon adsorbent Carbopack Y (CpY) before and after drawing a monomolecular layer of tetrakis(dodecanoyloxy)hydroquinone (TDHQ) on its surface are measured by gas chromatographic method. Adsorption properties of CpY / TDHQ and graphitized thermal carbon black modified by nematic crown-ether are compared. It is shown that drawing of monolayers of polar modifiers on a carbon substrate leads to occurrence of specific intermolecular interactions «polar adsorbat – adsorbent». Isomeric xylens are selectively adsorbed on the considered modified adsorbents. The sequence, in which Henry's constants increase (meta- → para- → ortho-), testifies that molecules of the modifiers form orientation ordered monolayers on carbon substrates.

Keywords: gas-solid chromatography, modified carbon adsorbents, "adsorbat – adsorbent" interactions





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