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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 (3), 29—40.
DOI: 10.18083/LCAppl.2017.3.29

Structural and Thermodynamic Properties of the Interfacial Area of Non-Ionic Micelles in Solutions of Ethoxylated Alkylpolyethers

V. S. Kuznetsov1, N. V. Usol'tseva1, V. P. Zherdev2, L. N. Zhukova1, N. V. Zharnikova1, A. I. Smirnova1

Author affiliations
1Ivanovo State University, Nanomaterials Research Institute,
39 Ermak St., Ivanovo, 153025, Russia
2Ivanovo State Polytechnic University,
8 March St., 20, Ivanovo, 153037, Russia

For spherical micelles in solutions of nonionic surface-active substances, a semiempirical method for calculating interfacial tension is proposed. The method is based on the comparison of the change in the size of micelle nuclei to a transition from one homologue to another, the use of the experimental isotherms of the surface tension of solutions and the corresponding Laplace equation. Dimensions of micelles nuclei, interphase layer and other structural parameters are calculated based on the concept of hydrophilic-lipophilic balance. The method is applied to micelles of two homologous series of ethoxylated polyethers – alkyl ethers of tetraethylene glycol C6EmH and hexyl esters of polyethylene glycol C6EmH. It is shown that the studied homologous series CmE4H and C6EmH are differently arranged with respect to the sizes of the micelles nuclei, critical micellar concentrations, aggregation numbers and interfacial tension. The dimensional dependences of the last in homological series have an asymptotic character.

Keywords: semiempirical method, spherical micelles, ethoxylated polyethers, interfacial tension, Laplace equation, hydrophilic-lipophilic balance, numbers of aggregation

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