Interactions between N -tetradecyl- N , N -dimethyl- N -(2,3-epoxypropyl) ammonium chloride and some surfactants

The interactions between the reactive cationic surfactant, N -tetradecyl- N , N -dimethyl- N -(2,3-epoxy propyl) ammonium chloride (TDEAC) and common surfactants, i.e., sodium dodecyl sulfate (SDS) sodium dodecyl sulfonate (AS), dodecyltrimethylammonium chloride (DTAC) and N , N -dimethyldodecylamine oxide (C 12 DMAO) are studied through surface tension, conductivity, steady-state fluorescence and dynamic light scattering as well as Rubingh regular solution methods. The calculated values of cmc, γ cmc , p c 20 , π cmc , Г max , and A min indicate a strong synergistic effect between TDEAC and SDS (and AS) as compared with the relatively weak interaction of TDEAC with DTAC (and C 12 DMAO). The cmcs of the mixed surfactant systems vary with temperature. Thermodynamic parameters calculated from conductivity data show that the micellization of TDEAC/SDS (AS) mixed systems is a spontaneous and exothermic process. Data from steady-state fluorescence, dynamic light scattering and Rubingh’s regular solution approach, confirm the strong interaction between surfactants.