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Mixed Micellization and Surface Properties of Ionic Liquids/Triton X-100 Mixture System in Aqueous Media

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Published/Copyright: August 16, 2013
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Abstract

Two binary systems of nonionic surfactant Triton X-100 and imidazolium ionic liquid surfactants with different carbon chain: C12mimBr (1-dodecyl-3-methylimidazolium bromide) and C14mimBr (1-tetradecyl-3-methylimidazoliumbromide) have been studied in this paper. The micellization and surface properties of the binary systems were determined by surface tension and conductivity methods, respectively. The critical micelle concentration (CMC), the maximum surface excess (Γmax), minimum area per molecule (Amin) and surface pressure at the CMC (ΠCMC) of single and mixed systems were obtained. Rubingh's theory was used to calculate the composition of the mixtures, and the molecular interaction parameter β. Negative value of β indicates synergism in mixed micelle formation. The order of absolute value of β and average β: C12mimBr/Triton X-100 > C14mimBr/Triton X-100. The values of ΔG0m and ΔG0ads have also been calculated, and both of them were found to be negative in all pure and mixed surfactants, indicating the spontaneity of micellization and adsorption of the surfactants.

Kurzfassung

In dieser Arbeit wurden zwei binäre Systeme aus dem nichtionischen Tensid Triton X-100 und ionischen Flüssigkeiten mit unterschiedlicher Kohenstoffkettenlänge (C12mimBr [1-Dodecyl-3-methylimidazoliumbromid] und C14mimBr [1-Tetradecyl-3-methylimidazoliumbromid]) untersucht. Die Mizellenbildung und die Oberflächeneigenschaften der binären Systeme wurden mit Hilfe von Oberflächenspannungs- und Leitfähigektismethoden bestimmt. Die kritische Miszellenbildungskonzentration (CMC), der maximale Oberflächenüberschuss (Γmax), der minimale Platzbedarf eines Moleküls (Amin) und der Oberflächendruck an der CMC (ΠCMC) des Mischsystems sowie der Einzelsystem wurden gemessen. Mit der Rubingh-Theorie wurden die Zusammensetzungen der Mischungen und der molekulare Wechselwirkungsparameter β berechnet. Negative β-Werte weisen auf Synergismen bei der Mischmizellenbildung hin. Die Reihenfolge der absoluten β- und der durchschnittlichen β-Werte ist: C12mimBr/Triton X-100 > C14mimBr/Triton X-100. Die Energien ΔG0m und ΔG0ads wurden ebenfalls berechnet. Beide waren für alle reinen und gemischten Tenside negativ, was auf eine spontane Mizellenbildung und Adsorption der Tenside hinweist.


* Correspondence address, Genxiang Luo, Department of Chemistry, School of Chemistry and Materials Science, Liaoning Shihua University, 113001, P. R. China, Tel.: +86-24-56 86 05 48, Fax: +86-24-56 86 05 48, E-Mail:

Lei Sun is a postgraduate student of analytical chemistry at Liaoning Shihua University. Her current research involves synthesis and surface properties of the ionic liquid surfactants.

Chunyu Han studied analytical chemistry at Liaoning Shihua University where he received his master's degree in 2008. He then joined the group of Prof. Genxiang Luo. He is currently working as an associate professor in the chemistry department at Liaoning Shihua University. His research involves the synthesis and characterization of surfactants.

Chunsheng Liu is an associate professor at the Liaoning Shihua University. His areas of interest are the synthesis and application of surfactants.

Genxiang Luo is a Professor at Liaoning Shihua University. His primary research field is colloid and surfactants. His current research involves the synthesis and surface properties of the ionic liquid surfactants.


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Received: 2012-10-28
Published Online: 2013-08-16
Published in Print: 2013-05-15

© 2013, Carl Hanser Verlag, Munchen

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