Interaction parameter of anhydrous cationic surfactant mixtures by inverse gas chromatography

S.M. BARDAVID; P.C. SCHULZ; E.L. ARANCIBIA

JOURNAL OF SOLUTION CHEMISTRY

SPRINGER/PLENUM PUBLISHERS

Lugar: New York; Año: 2012 vol. 41 p. 1197 - 1209

0095-9782

The miscibility of anhydrous cationic surfactant dodecylpyridinium chloride(DPC) and hexadecylpyridinium bromide (cetylpyridinium bromide (CPB)) mixtures hasbeen studied by using them as stationary phases in Inverse Gas Chromatography (IGC). Thetemperature zone of work was determined by IGC and Differential Scanning Calorimetry(DSC) techniques. Values of the interaction parameter between the surfactants obtained atfour different compositions and at four temperatures showed that the miscibility depends onthe overall composition and suggested that the interactions are more favorable near the centerof the composition range. Results are compared with other anhydrous cationic surfactantmixtures studied by IGC, the system didodecyldimethylammonium bromide (DDAB) anddioctadecyldimethylammonium bromide (DODAB), two twin-tailed surfactants, and are interpreted in terms of the structure of the anhydrous lamellar liquid crystals compared withthat of aqueous lamellar mesophases.