Startseite Effect of Alcohols on the cmc and Micelle Ionization Degree of Alkanediyl-α,ω-bis(Dimethyldodecylammonium Bromide) Surfactants
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Effect of Alcohols on the cmc and Micelle Ionization Degree of Alkanediyl-α,ω-bis(Dimethyldodecylammonium Bromide) Surfactants

  • M. Benrraou und R. Zana
Veröffentlicht/Copyright: 8. Mai 2013
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Tenside Surfactants Detergents
Aus der Zeitschrift Tenside Surfactants Detergents Band 42 Heft 3

Abstract

The critical micelle concentration (cmc) of three dimeric surfactants of the alkanediyl-α,ω-bis(dimethyldodecylammonium bromide) type, one trimeric surfactant and two conventional monomeric surfactants has been measured in the presence of increasing amounts of linear 1-alcohols (methanol to hexanol), using the electrical conductivity method. The results show little difference in the variations of cmcA/cmcW (cmcA and cmcW = cmc values in a water/alcohol mixture and in water) for the monomeric, dimeric and trimeric surfactant with the alcohol concentration for alcohols that are very soluble in water (methanol and ethanol) or hardly soluble in water (pentanol and hexanol). Significant differences are observed only for alcohols that are partitioned between water and micelles (mainly propanol and butanol). Large differences in the solubility of butanol in micellar solutions of the three dimeric surfactants observed at high surfactant concentration appear to be associated to differences in micelle shape. The ionization of dimeric surfactant micelles in ethanol/water mixtures increases nearly linearly with the ethanol content.

Kurzfassung

Die kritische Mizellbildungskonzentration (cmc) dreier dimerer Tenside des Typs Alkandiyl-α,ω-bis(dimethyldodecylammoniumbromid), eines trimeren Tensides und zweier konventioneller monomerer Tenside ist in Gegenwart zunehmender Mengen von linearen 1-Alkoholen (Methanol bis Hexanol) mittels elektrischer Leitfähigkeit gemessen worden. Die Resultate zeigen wenig Unterschied in den Variationen von cmcA/cmcW (cmcA und cmcW = CMC-Werte in einer Wasser/Alkohol-Mischung und in Wasser) für monomere, dimere und trimerie Tenside bei Alkoholen, die gut löslich in Wasser (Methanol und Äthanol), oder in Wasser kaum löslich sind (Pentanol und Hexanol). Deutliche Unterschiede werden nur bei Alkoholen beobachtet, die zwischen Wasser und den Mizellen partioniert sind (hauptsächlich Propanol und Butanol). Die großen Unterschiede der Löslichkeit von Butanol in mizellaren Lösungen bei den drei dimeren Tensiden, die bei hoher Tensidkonzentration beobachtet werden, scheinen mit den unterschiedlichen Mizellenformen in Zusammenhang zu stehen. Die Ionisierung der dimeren Tensidmizellen in Ethanol/Wasser-Mischungen erhöht sich nahezu linear mit dem Gehalt an Ethanol.

Keywords:: Monomeric surfactants; dimeric (gemini) surfactants; critical micelle concentration; ionisation; solubilization
Schlüsselwörter: Monomere Tenside; dimere (Gemini) Tenside; kritische Mizellbildungskonzentration; Ionisierung; Solubilisierung
3R. Zana, Institut C. Sadron 6 rue Boussingault 67000 Strasbourg France E-mail:

Dr. Mohamed Benrraou obtained his doctorate degree from the University L. Pasteur of Strasbourg. He presently holds a position of Assistant-Professor at the University Moulay Ismael at Errachidia (Morocco).

Dr. Raoul Zana presently holds a position of Directeur de Recherches Emeritus at the CNRS (France). His current research interests cover many aspects of Surfactant Science, most particularly dynamics of micelles, gemini surfactants, anionic surfactants with large counterions or head groups. He has much published in the field and edited 3 volumes in the Surfactant Science Series.

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Received: 2005-1-27
Published Online: 2013-05-08
Published in Print: 2005-06-01

© 2005, Carl Hanser Publisher, Munich

Artikel in diesem Heft

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Review Article
  6. Pulmonary Surfactant and its in vitro Assessment Using Axisymmetric Drop Shape Analysis (ADSA): A Review
  7. Application
  8. Cleanability of Plastic Flooring Materials Related to their Surface Properties
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  10. New Hydroxylated Cationic Gemini Surfactants as Effective Corrosion Inhibitors for Mild Steel in Hydrochloric Acid Medium
  11. Physical Chemistry
  12. Dynamic Properties of Surfactants: Influence on Processes and Technologies
  13. Effect of Alcohols on the cmc and Micelle Ionization Degree of Alkanediyl-α,ω-bis(Dimethyldodecylammonium Bromide) Surfactants
  14. Molecular Dynamics
  15. The Self-Assembly of an Amphiphilic Block Copolymer: A Dissipative Particle Dynamics Study
https://doi.org/10.3139/113.100257
Schlagwörter für diesen Artikel
Monomeric surfactants; dimeric (gemini) surfactants; critical micelle concentration; ionisation; solubilization

Artikel in diesem Heft

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Review Article
  6. Pulmonary Surfactant and its in vitro Assessment Using Axisymmetric Drop Shape Analysis (ADSA): A Review
  7. Application
  8. Cleanability of Plastic Flooring Materials Related to their Surface Properties
  9. Soiling Tendency of Worn, Plastic Flooring Materials Related to their Surface Topography
  10. New Hydroxylated Cationic Gemini Surfactants as Effective Corrosion Inhibitors for Mild Steel in Hydrochloric Acid Medium
  11. Physical Chemistry
  12. Dynamic Properties of Surfactants: Influence on Processes and Technologies
  13. Effect of Alcohols on the cmc and Micelle Ionization Degree of Alkanediyl-α,ω-bis(Dimethyldodecylammonium Bromide) Surfactants
  14. Molecular Dynamics
  15. The Self-Assembly of an Amphiphilic Block Copolymer: A Dissipative Particle Dynamics Study
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