SODIUM DI-N-DODECYL PHOSPHATE VESICLES IN AQUEOUS-SOLUTION - EFFECTS OF ETHANOL, PROPANOL, AND TETRAHYDROFURAN ON THE GEL TO LIQUID-PHASE TRANSITION

For aqueous solutions containing vesicles formed by sodium di-n-dodecy l phosphate, the gel to liquid-crystal transition occurs near 35 degre es C, the temperature T-m. When ethanol is added, T-m decreases, but t he scan shows evidence of several transitions as more alcohol is added . The effect of added THF and propanol is similar but more dramatic. T he scans are similarly complicated if the aqueous solutions are prepar ed using a solution of DDP in ethanol. However, vesicle <-> ethanol in teractions are endothermic although the shift in T-m points to direct binding of alcohol into the vesicle.