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Licensed Unlicensed Requires Authentication Published by De Gruyter April 2, 2013

Formation of Multilamellar Vesicles in the Systems of Decyltrimethylammonium hydroxides/2-hydroxy 1-carboxy-naphthoate and Octyltrimethylammonium hydroxides/2-hydroxy 1-carboxy-naphthoate

Bildung von multilamellaren Vesikeln in den Systemen Decyltrimethylammoniumhydroxid/2-Hydroxy-1-Carboxy-Naphthoat und Octyltrimethylammoniumhydroxid/2-Hydroxy-1-Carboxy-Naphthoat
  • R. Abdel-Rahem


We have investigated the phase behavior and characterized the microstructure of the phases that result from mixing of alkyltrimethylammonium hydroxides CxTAOH (x = 10.8) with 2-hydroxy 1-carboxy-naphthoate. We compare the results of this work with the published one of alkyltrimethylammonium 2-hydroxy-1-carboxy-naphthoate (CxTA 2,1 HCN, x = 16.14 or 12) [2]. With increasing counter-ion surfactant ratio r we observed transition from the isotropic L1-phase to multilamellar vesicles (MLV) Lα-phase. The single phases are separated by a two phase L1/Lα region. The phases were characterized with FF-TEM, rheological and SANS measurements. For 100 mM solution of either C8TAOH/2,1 HNC or C10TAOH/2,1 HNC, both MLV phases behave like a weak gel and have a yield stress value. It is thus shown that it is possible to prepare viscoelastic surfactant solutions with a small yield stress value from single chain surfactants with decyl or octylchain.


Wir haben das Phasenverhalten untersucht und die Mikrostruktur der Phasen charakterisiert, die durch Mischung aus Alkyltrimethylammoniumhydroxid CxTAOH (x = 10,8) mit 2-Hydroxy-1-Carboxy-Naphthoat resultiert. Wir haben die Ergebnisse dieser Arbeit mit den bereits veröffentlichten von Alkyltrimethylammonium 2-Hydroxy-1-Carboxy-Naphthoat (CxTA 2,1 HCN, x = 16,14 or 12) verglichen [2]. Mit Erhöhung des Verhältnisses Gegenion/Tensidion r, beobachteten wir einen Übergang von der isotropen L1-Phase zur multilamellaren Vesikel (MLV) Lα-Phase. Die Einzelphasen sind durch eine Zweiphasenregion L1/Lα getrennt. Die Phasen wurden mittels FF-TEM, rheologischen and SANS-Messmethoden charakterisiert. Pro 100 mM Lösung von entweder C8TAOH/2,1 HNC oder C10TAOH/2,1 HNC verhalten sich beide MLV-Phasen wie ein weiches Gel und haben eine Fließgrenze. Dadurch wird gezeigt, dass es möglich ist, viskoelastische Tensidlösungen mit geringer Fließgrenze aus Einzelketten-Tensiden mit Decyl- oder Octylketten darzustellen.

Dr. Rami Abdel-Rahem, Al Ahsa Teachers College, Qatar street, P.O. Box 2313, Al Hafouf 31982, Al-Ahsa, Kingdom of Saudi Arabia. E-mail:

Dr. Rami Abdel-Rahem was born in 1974 (in As Sarih-Jordan), studied applied chemistry at Jordan University of Science and Technology. He obtained his PhD in 2003 from Bayreuth University (Germany) under supervision of Prof. Dr. Heinz Hoffmann. From 2003 until 2005, he worked as a lecturer of physical chemistry at the university of Al-Margeb (Libya). Since 2005, he has been an assistant professor of physical chemistry at Al Ahsa Teachers College (Kingdom of Saudi Arabia). Areas of interest are phase behaviour, rheology and physical properties of surfactants.


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Received: 2007-02-04
Published Online: 2013-04-02
Published in Print: 2007-06-01

© 2007, Carl Hanser Publisher, Munich

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