A study of the interaction of dodecyl sulfobetaine with cationic and anionic surfactant in mixed micelles and monolayers at the air/water interface

Paweł Wydro; Maria Paluch

doi:10.1016/j.jcis.2004.12.039

A study of the interaction of dodecyl sulfobetaine with cationic and anionic surfactant in mixed micelles and monolayers at the air/water interface

J Colloid Interface Sci. 2005 Jun 1;286(1):387-91. doi: 10.1016/j.jcis.2004.12.039.

Authors

Paweł Wydro¹, Maria Paluch

Affiliation

¹ Department of Physical Chemistry and Electrochemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland. wydro@chemia.uj.edu.pl

PMID: 15848442
DOI: 10.1016/j.jcis.2004.12.039

Abstract

The miscibility and interactions between components in mixed adsorbed films and micelles containing zwitterionic (dodecyl sulfobetaine--DSB) and cationic (dodecyltrimethylammonium bromide) or anionic (sodium dodecyl sulfonate) surfactant, respectively, have been investigated. The molecular interactions have been quantified by the values of the excess free energy of adsorption (DeltaGS,Exc) and micelle formation (DeltaGM,Exc). The obtained results indicate nonideal behavior of the investigated mixtures since the values of DeltaGS,Exc and DeltaGM,Exc) are negative. Moreover, it has been found that DSB interact more strongly with anionic surfactant as compared to cationic surfactant owing to different structure of mixed monolayers and micelles.