Abstract:

The surface adsorption and micelle formation of the mi xed systems of trimethyl[2-(10-undecenoyloxyl ethyl)]ammonium iodide and sodium 10-undecenoate have been investigated by tensiometry; The vesicle formation has been also demonstrated by TEM. It has shown that the mixed cationic-anionic surfactants containing the double bond in the end of hydrocarbon chains, as well as those containing saturated hydrocarbon chains, have a high surface activity and a high tendency to adsorb at the air/water surface and to form micelles in the solution; Moreover, quite stable vesicles from these systems can be also formed in the aqueous solution and ethanol/water solution. All of these may be attributed to the strongly electrostatic interaction between the cationic and anionic surfactants.

Key words: 10-undecenoic acid derivatives, Cationic-anionic surfactants, Surface adsorption, Micelle, Vesicle