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Physicochemical Properties of Quaternary Ammonium Surfactants with Hydroxyethyl Groups

  • Ruitao Wang , Yunling Li and Qiuxiao Li
Published/Copyright: May 1, 2013
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Abstract

Two cationic quaternary ammonium surfactants with hydroxyethyl groups, dodecyl-(2-hydroxyethyl)-dimethylammonium chloride (DHDAC), and dodecyl-di(2-hydroxyethyl)-methylammonium chloride (DHHAC) were synthesized. Their physicochemical properties were investigated systematically by surface tension and conductivity measurements. Various physicochemical parameters were calculated to evaluate the surface activities of these surfactants. The results show that the surface activity increases with increasing the number of hydroxyethyl groups on hydrophilic groups of surfactants. The degrees of counterion binding to micelles of these surfactants were also discussed. The thermodynamic parameters obtained from electric conductivity measurements show that the micelle formation of DHHAC is entropy-driven in the temperature range investigated. However, it is enthalpy-driven for DHDAC.

Kurzfassung

Es wurden zwei kationische quaternäre Ammoniumtenside mit Hydroxyethylgruppen synthetisiert: Dodecyl-(2-hydroxyethyl)-dimethylammoniumchlorid (DHDAC) und Dodecyl-di(2-hydroxyethyl)-methylammoniumchlorid (DHHAC). Ihre physico-chemischen Eigenschaften wurden systematisch mittels Messungen der Oberflächenspannung und der Leitfähigkeit untersucht. Verschiedene physico-chemische Parameter wurden berechnet, um die Oberflächenaktivitäten dieser Tenside zu bewerten. Die Ergebnisse zeigen, dass die Oberflächenaktivität mit steigender Zahl der Hydroxyethylgruppen im hydrophilen Teil des Tensids zunimmt. Der Ausmaß der Gegenionbindung zu Mizellen der Tenside wurde ebenfalls diskutiert. Die aus den Messungen der Leitfähigkeiten erhaltenen thermodynamischen Parameter zeigen, dass die Mizellenbildung von DHHAC in dem untersuchten Temeraturbereich von der Entropie bestimmt wird. Bei DHDAC ist jedoch die Enthalpie bestimmend.


Correspondence address Mrs. Prof. Yunling Li, 34# Wenyuan Str., Taiyuan, Shanxi Province, 030001, P. R. China, Tel.: 0 86-03 51-4 04 68 27, Fax: 0 86-03 51-4 04 08 02, E-Mail:

Ruitao Wang received a B. Sc. in chemical engineering and technology from Baoji university of arts and sciences, P. R. China in 2011 and is currently an M. Sc. Student in Applied Chemistry, China Research Institute of Daily Chemical Industry, P. R. China. He is involved in synthesis and applications of surfactants.

Yunling Li received a Ph. D in Applied Chemistry from the Shanxi University, P. R. China and is currently a professor of engineering in the China Research Institute of Daily Chemical Industry, P. R. China. Her research interests include surfactants and industrial catalysis.

Qiuxiao Li is currently a dean of China (RIDCI). He received his Ph. D. from Chinese Academy of Sciences (2003). His research interests are focused on the engineering development related to manufactures of surfactants and physicochemistry.


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Received: 2013-06-04
Accepted: 2013-09-04
Published Online: 2013-05-01
Published in Print: 2014-01-20

© 2014, Carl Hanser Publisher, Munich

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