Abstract:

Molecular organized assemblies of 1:1 mixed solution of sodium alkylcarboxylate-alkyltrimethylammonium bromide were investigated in formamide(FA) and FA/water mixtures. The critical micelle concentration(cmc) values of catanionic surfactants determined by the surface tesion curves increase as the fraction of FA in the mixed solvents increases. Above the Kraft point(~45°C), micellization and surface adsorption properties of mixed surfactants in FA were studied. The cmc is 0.167,0.172 and 0.179mol-dm-3 for 50,55 and 60℃. The standard thermodynamic parameters of micellization for catanionic surfactants in FA were calculated according to the model of charged pseudo-phased separation The influence of FA addition on catanionic surfactant vesicle was also studied.

Key words: Molecular organized asscmblies, Micelle, Vesicle, Non-aqueous solvent