Journal of Surfactants and Detergents

, Volume 17, Issue 2, pp 309–321 | Cite as

Amphiphilic Properties of Dodecylammonium Chloride/4-(1-Pentylheptyl) Benzene Sodium Sulfonate Aqueous Mixtures and Study of the Catanionic Complex

  • Tea MiheljEmail author
  • Vlasta Tomašić
Original Article


Surfactants are often used in supramolecular chemistry, due to their ability to self-organize. Surfactant molecules aggregate spontaneously and reversibly to adopt a defined intermolecular arrangement. In this work, general phase behavior, adsorption and association in aqueous mixtures of dodecylammonium chloride, DACl and sodium 4-(1-pentylheptyl) benzenesulfonate, NaDBS, were studied by a combination of techniques including surface tension and conductivity measurements, light scattering and optical microscopy. The strong synergistic properties of the system were brought out with the Regular Solution Theory. Various colloidal objects are observed in wide range of composition: conventional small vesicles, large giant multilamellar or multivesicular vesicles. An excess of NaDBS provides extremely large tubular and elongated multilamellar vesicles. The new catanionic 1:1 complex, dodecylammonium-4-(1-pentylheptyl) benzenesulfonate, formed in the equimolar conditions is a result of intramolecular charge neutralization. The thermal properties of this solid compound were examined by thermal polarizing microscopy, differential scanning calorimetry, and X-ray diffraction. The most probable ion-pair amphiphilic cluster of the crystal smectic phase, at room temperature, consists of ionic groups formed in ordered layers with dodecyl chains packed into somewhat disordered layers, tilted to the layer plane.


Surfactant mixtures Catanionic surfactant Mesomorphism Wide angle X-ray scattering Dodecylammonium-4-(1-pentylheptyl) benzenesulfonate 



The authors are pleased to acknowledge support of this work by the Ministry of the Science, Education, and Sport of the Republic of Croatia (Project No 098-0982915-2949). We are grateful to mr. sc. Vesna Vrdoljak in realization of partial precipitation diagram, to dr. sc. Dubravka Matković-Čalogović, Faculty of Science, University of Zagreb, for the X-ray diffraction measurements of the samples, and to Nikola Paić for his help with the manuscript preparation.


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Copyright information

© AOCS 2013

Authors and Affiliations

  1. 1.Department of Physical ChemistryRuđer Bošković InstituteZagrebCroatia

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