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A Comparative Study of Phase Behaviour in Aqueous Systems of Catanionic Surfactants and Ionic Surfactants with Organic Counterions

Vergleichende Untersuchung des Phasenverhaltens wäßriger Systeme, die katanionische und ionische Tenside mit organischen Gegenionen enthalten
S. Karlsson , R. Friman , S. Backlund and R. Eriksson

Abstract

Phase diagrams were determined at different temperatures for aqueous systems of alkylamines and alkanoic acids in an equimolecular ratio. The number of carbon atoms in the amines was varied from 4 to 12 and in the acids from 2 to 12. The obtained aqueous catanionic surfactant systems exhibit only two one-phase regions, i. e., isotropic liquid and lamellar liquid crystalline phases, while the obtained aqueous systems of ionic surfactant with organic counterion exhibit in addition also isotropic cubic and hexagonal liquid crystalline phases, and dispersions of vesicles. For one of the surfactants the parent acid was fluorinated.

Optical microscopy and low-angle X-ray diffraction measurements were performed on selected systems.

Kurzfassung

Es wurden die Phasendiagramme wäßriger Systeme mit Alkylaminen und Alkansäuren im equimolekularen Verhältnis bei verschiedenen Temperaturen bestimmt. Die Anzahl der Kohlenstoffatome der Amine wurde von 4 bis 12 und die der Säuren von 2 bis 12 variiert. Die erhaltenen wäßrigen katanionischen Tensid-Systeme zeigen nur zwei Einphasengebiete: die isotrope flüssige und die lamellare, kristalline Phase. Dagegen zeigen die erhaltenen wäßrigen Systeme aus ionischen Tensiden mit organischen Gegenionen zusätzlich isotrope kubische und hexagonal flüssig-kristalline Phasen und Vesikeldispersionen. Im Fall eines Tensids wurde die Ausgangsalkansäure fluoriert.

Bei ausgewählten Systemen wurden lichtmikroskopische und Klein-Winkelröntgenbeugungsmessungen durchgeführt.


Correspondence to Dr. Rauno Friman Åbo Akademi University, Department of Physical Chemistry, Porthaninkatu 3–5, FI-20500 Turku, Finnland,

Stefan Karlsson studied chemistry at Åbo Akademi University and obtained his PhD in 2001. He presently works as a physical chemist in the R&D department of Karlshamns AB, Sweden. His present research interests are fat crystallization and emulsion technology.

Rauno Friman studied chemistry at Åbo Akademi University and obtained his PhD in 1983. He presently works as a lecturer at Åbo Akademi University, Finland. His research interests include aggregation and phase structures in surfactant systems.

Sune Backlund studied chemistry at Åbo Akademi University and obtained his PhD in 1979. 2003he has retired from the lectureship at Åbo Akademi University. His research interests include phase studies, microemulsions and stereoselective enzymatic synthesis.

Rasmus Eriksson studies chemistry at Åbo Akademi University. His current research interst is filtration of concentrate dispersions.


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Received: 2004-1-5
Published Online: 2013-05-01
Published in Print: 2004-04-01

© 2004, Carl Hanser Publisher, Munich

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