Formation Kinetics of an Emulaion in the System Water, Didodecyldimethylammonium Bromide, And Sodium Xylenesulfonate

摘要

The ternary phase diagram, the colloidal structures involved and the kinetics of an unusual emulsion formation in the system water, sodium xylenesulfonate (a hydrotrope) and didodecyldimethylam- monium bromide (a surfactant) were determined using visual ob- servation, optical microscopy, light scattering, electrical conduc- tance and the stop-flow method. The results showed as expected that addition of the hydrotrope to the surfactant-water lamellar liquid crystal caused a disordering of it to an isotropic liquid, a microemulsion, but, surprisingly, for lesser hydrotrope/surfactant ratios the result of the addition was more ordered structures; a cubic liquid crystal and a plastic crys- tal.