Artículos de revistas
Miscibility of anhydrous cationic surfactant mixtures
Fecha
2010-09Registro en:
Bardavid, Sofia; Schulz, Pablo Carlos; Arancibia, Eleuterio Luis; Miscibility of anhydrous cationic surfactant mixtures; Elsevier Science; Journal of Molecular Liquids; 156; 2-3; 9-2010; 165-170
0167-7322
CONICET Digital
CONICET
Autor
Bardavid, Sofia
Schulz, Pablo Carlos
Arancibia, Eleuterio Luis
Resumen
Inverse gas chromatography (IGC) has been used for studying the miscibility of anhydrous cationic surfactant mixtures. Dodecyltrimethylammonium bromide (C12TAB), octadecyltrimethylammonium bromide (C18TAB) and their mixtures have been used as stationary phases. In these types of stationary phases, the working temperature was determined by Differential Scanning Calorimetric (DSC) and Inverse Gas Chromatography (IGC) techniques. Values of the interaction parameters between the cationic surfactants obtained at four different compositions of their mixtures and at five temperatures showed that the miscibility depended on the composition and suggested that the interactions became more unfavorable with the increment of C18TAB concentration in the mixtures. The results have been interpreted by comparing the structure of the anhydrous lamellar liquid crystals with that of the lamellar mesophases formed in aqueous solutions. Deviations of the systems from the parameter solubility model have been discussed in terms of the entropy contribution to the Flory-Huggins interaction parameter.