No abstract

A quaternary system made of an ionic surfactant (SDS), octanol, water and sodium chloride has been investigated. We present experimental results that demonstrate the existence of a phase of vesicles at thermal equilibrium. We show that vesicles can be prepared both in a dilute regime leading to an isotropic liquid phase of low viscosity and in a concentrated regime leading to a phase of close packed vesicles (probably multilayered) exhibiting high viscosity and viscoelasticity

We report on the effect of a hydrosoluble neutral polymer on the stability of a lamellar phase made of charged surfactant bilayers. In the system investigated, the smectic structure exists for a wide range of dilutions, with smectic periods continuously varying between 30 and 300 I. Our results show that the lamellar The eventual presence of critical points on the border of the closed-loop smecticsmectic miscibility gap is investigated 1.