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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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We are pleased to inform that the journal Liquid Crystals and their Application is included in Web of Science (Emerging Sources Citation Index) and Scopus databases.

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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2017, 17 (2), 51—61.
DOI: 10.18083/LCAppl.2017.2.51





Micelle Formation in Dimethyl Sulfoxide – Water Binary Solvent in Presence of NaCl. Planning and Optimization of Experiment



R. F. Bakeeva, R. A. Karimullin, R. F. Kurabasheva, T. S. Gorbunova, O. E. Vakhitova, V. F. Sopin

Author affiliations
Department of Analytical Chemistry, Kazan National Research Technological University,
68 K. Marx St., Kazan, 420015, Russia
E-mail: bakeeva@kstu.ru

Abstract
The process of micelle formation in a mixture of nonionic surfactant (cetyl ether of polyoxyethylene (10), Brij56) and anionic surfactant (sodium dodecyl sulfate, SDS) in the presence of NaCl electrolyte in dimethyl sulfoxide – water binary solvent by the tensiometric method was studied. The influence of content of dimethyl sulfoxide, NaCl, Brij 56 and SDS was studied. A multifactorial experiment was performed to optimize the selecting process of a system based on the mixture of surfactants in the binary solvent with the lowest values of the critical micelle concentration (CMC). For this, the methodology for determining the response surfaces and the three-level Box – Behnken plans were applied. Using the "Statistica 10" software package, the most significant factors were identified, the interaction effects between them were evaluated, the response surfaces were constructed and the optimal conditions for obtaining mixed systems with minimal CMC values were determined. The minimum value of CMC in the SDS + Brij 56 + NaCl + DMSO + H2O system was achieved under the following composition: αBrij56 = 0,680; CNaCl = 0,140 mol/l; ωDMSO = 0,024 (2,4 %). The minimum CMC of this mixture equals to 3,137·10–5 mol/l. The experimental data are consistent with the calculated values of CMC (3,05 ± 0.091)·10–5 mol/l.

Keywords: micelles, surface tension, tensiometry, ionic and nonionic surfactants, dimethyl sulfoxide, sodium dodecyl sulfate, Brij 56, Box – Behnken plans





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