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Licensed Unlicensed Requires Authentication Published by De Gruyter March 31, 2013

Microemulsions Using Hexaethylene Glycol Mono-n-dodecyl Ether Nonionic Surfactant and Small Amount of Ionic Surfactants

Mikroemulsionen unter Verwendung des nichtionischen Tensids Hexaethylenglykolmono-n-dodecylether und geringen Mengen von ionischen Tensiden
  • M. Alibrahim


The influence of small addition of ionic surfactant such as sodium dodecyl sulfate (SDS) and carboxylate ethoxyle (TDC) to nonionic surfactant hexaethylene glycol mono-n-dodecyl ether (C12E6) on the microemulsions formed in the system water/decane/surfactant was studied. An empirical description of the phase behaviour is presented that permits to determine the PIT, and what efficiency of the surfactants to expect. The investigation showed an expected rise in the temperature at which maximum solubility was observed (PIT), and a pronounced extension of the solubility area was also observed. In addition, the temperature stability of these microemulsions was improved. The structural study of the system water/(C12E6+1% TDC) shows that the liquid crystal phase is lamellar at 45°C. It's structural parameters are determined by small angle X-ray scattering. The study of lamellar phase allows the description of the evolution of the surfactant chains conformation.


Der Einfluss geringer Zugaben eines ionischen Tensids, wie Natriumdodecylsulfat (SDS) und carboxyliertes Ethoxylat (TDC) zum nichtionisches Tensid Hexaethylenglykolmono-n-dodecylether (C12E6) auf die ausgebildeten Mikroemulsionen im Wasser/Dekan/Wasser-System wurde untersucht. Es wird eine empirische Beschreibung des Phasenverhaltens vorgestellt, die eine Bestimmung der PIT und die zu erwartende Effizienz der Tenside erlaubt. Die Untersuchung zeigte einen zu erwartenden Anstieg der Temperatur, bei der die maximale Löslichkeit beobachtet wird. Eine ausgeprägte Ausdehnung des Löslichkeitsbereich wurde ebenfalls beobachtet. Zusätzlich wurde die Temperaturstabilität dieser Mikroemulsionen verbessert. Die strukturelle Untersuchung des Systems Wasser/(C12E6+1% TDC) zeigt, dass die Flüssigkristallphase bei 45°C lamellar ist. Ihre strukturellen Parameter wurden mittels Roentgenkleinwinkelstreuung bestimmt. Die Untersuchung der lamellaren Phase erlaubt die Beschreibung zur Entwicklung der Tensidkettenkonformation.

Dr. M. Alibrahim, Atomic Energy Commission, Chemistry Departement, P.O. Box: 6091, Damascus, Syria. E-mail:

Moussa Alibrahim was born in 1955 and obtained his B.Sc. in the field of chemistry from Damascus university in 1979 and his Ph.D. in the field of Chemistry and molecular physical chemistry (France-Nancy university I, 1988). In 1980he started working in the Syrian Atomic Energy Commission in chemistry department. He has been awarded to prepare his Ph.D. in France (Nancy university I) from 1982 to 1988, under the supervision of Prof. J. C. Ravey; Prof. C. Tondre; Prof. M. J. Stebe and J. J. Delpuech. His theses presented subject is [SYSTEMES A BASE DE TENSIOACTIFS NONIONIQUES: INFLUENCE DE CO-TENSIOACTIFS IONIQUES ET STRUCTURE DES PHASES MESOMORPHES]. He restarted working in the chemistry department of the Syrian Atomic Energy Commission again from 1989 until now, in the field of Physical Chemistry and Solvent Extraction.


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Received: 2006-03-23
Published Online: 2013-03-31
Published in Print: 2006-09-01

© 2006, Carl Hanser Publisher, Munich

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