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Synergism in Mixed Anionic–Amphoteric Surfactant Solutions: Influence of Anionic Surfactant Chain Length

  • R. Abdel-Rahem
Published/Copyright: April 2, 2013
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Tenside Surfactants Detergents
From the journal Tenside Surfactants Detergents Volume 46 Issue 5

Abstract

The influence of chain length on the composition of mixed micelles in binary mixtures of N,N-dimethyldodecylamine oxide (DDAO) and sodium decyl-, sodium dodecyl- and sodium tetradecylsulfate (abbreviated as SDeS, SDS and STS, respectively) has been determined at 30°C. From the surface tension measurements, the critical micelle concentration (cmc) data were measured as a function of mixing composition. Cmc-values were then analyzed according to regular solution model. The composition of mixed micelles, the interaction parameter (β) and the activity coefficients were evaluated from the regular solution model for the all anionic-amphoteric mixed systems. The interaction parameter values indicated a synergistic interaction between DDAO and the three anionic surfactants at all mole fractions to be due to an overall attractive interaction in the mixed micelles. The strength of the interaction between the amphoteric surfactant and the sodium alkyl sulfate in three mixed systems obeys the following order: SDeS/DDAO > SDS/DDAO > STS/DDAO suggesting that the decrease in the length of anionic surfactant alkyl chain results in a stronger interaction with DDAO. On the other hand, the viscosity data reveals a viscosity increasing trend of STS/DDAO > SDS/DDAO > SDeS/DDAO.

Kurzfassung

Der Einfluss der Kettenlänge auf die Zusammensetzung von Mischmizellen in binären Mischungen von N,N-Dimethyldodecylaminoxid (DDAO) und Natriumdecyl- sowie Natriumdodecyl- und Natriumtetradecylsulfat (SDeS, SDS und STS) wurde bei 30°C bestimmt. Aus den Messungen der Oberflächenspannung wurden die kritischen Mizellbildungskonzentrationen (cmc) als Funktion der Mischanordnung bestimmt. Die cmc-Werte wurden dann dem regulären Lösungsmodell entsprechend analysiert. Die Zusammensetzung der Mischmizellen, der Wechselwirkungsparameter (β) und die Aktivitätskoeffizienten wurden für alle anionisch-amphoteren Mischsysteme aus dem regulären Lösungsmodell bewertet. Die Werte der Wechselwirkungsparameter zeigen eine synergistische Wechselwirkung zwischen DDAO und den drei anionischen Tensiden bei allen Molenbrüchen, aufgrund der allgemeinen Anziehungswechselwirkung in den Mischmizellen. Die Stärke der Wechselwirkung zwischen den amphoteren Tensiden und Natriumalkylsulfat gehorchen in drei Mischsystemen der Reihenfolge: SDeS/DDAO > SDS/DDAO > STS/DDAO, was darauf hinweist, dass eine Verkürzung der anionischen Tensidalkykettenlänge eine stärkere Wechselwirkung mit DDAO bewirkt. Andererseits zeigen die Viskositätswerte eine Viskositätszunahme in Richtung STS/DDAO > SDS/DDAO > SDeS/DDAO.

Key words:: Mixed micelles; synergism; critical micelle concentration; interaction parameters; amphoteric surfactant
Stichwörter:: Mischmizellen; Synergismus; kritische Mizellbildungskonzentration; Wechselwirkungsparameter; amphoteres Tensid
∗ Dr. Rami Abdel-Rahem, King Faisal University, Teachers College of Alhassa, Department of Science, Section of Chemistry, Al Hafouf 31982, Kingdom of Saudi Arabia, E-Mail:

Dr. Rami Abdel-Rahem was born in As Sarih (Jordan) in 1974. He studied Applied Chemistry at Jordan University of Science and Technology and got his Master at middle of 2000 under supervision of Dr. Bassam Al-Bitar. At end of 2000, Dr. Abdel-Rahem joined the group of Prof. Dr. Heinz Hoffmann at Bayreuth University (Germany) and received a PhD in Physical Chemistry at 2003. Areas of interest are surfactants properties, rheology, electron microscopy, phase behaviour and physical properties of polymer composite.

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Received: 2009-02-28
Revised: 2009-04-26
Published Online: 2013-04-02
Published in Print: 2009-09-01

© 2009, Carl Hanser Publisher, Munich

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https://doi.org/10.3139/113.110035
Keywords for this article
Mixed micelles; synergism; critical micelle concentration; interaction parameters; amphoteric surfactant

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Application
  6. Micelles Activated Planar Chromatographic Separation of Hydrophilic Vitamins
  7. Molecular, Surface, Thermodynamic Properties and Biodegradability of Nonionic Surfactants Based on Castor Oil
  8. Basic Science
  9. Characterization of Commercial Polysorbates Using Different Chromatographic Techniques
  10. Environmental Chemistry
  11. Synthesis of Nanocrystal TiO2 and Study of Photocatalytic Degradation Property
  12. Novel Surfactants
  13. Reversible Performance of Dodecyl Tetramethyl Guanidine Solution Induced by CO2 Trigger
  14. Physical Chemistry
  15. Synergism in Mixed Anionic–Amphoteric Surfactant Solutions: Influence of Anionic Surfactant Chain Length
  16. Phase Behavior of Microemulsions Prepared from Surfactant-like Ionic Liquids
  17. Technical Chemistry
  18. Aqueous Solution Properties, Biodegradability, and Antimicrobial Activity of some Alkylpolyglycosides Surfactants
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