Surface activity, surface adsorption, and micelle formation were studied for 4 oxafluorocarbon surfactants (C3H7OCF(CF3)CF2OCF(CF3)COOH (C9FOH), C9FONa, (C2F5)C(CF3)C(CF3):C(CF3)OC6H4SO3Na, C2F5(OCF2CF(CF3))2OC2F4SO3Na) and their mixtures with SDS or Na cetyl sulfate. There is a remarkable mutual phobic interaction between 2 surfactants in the mixed adsorption layer even though both surfactants tend to form sep. micelles in mixed aqueous solns. General equations are presented for calculation of cmc and mixed micelle or adsorption layer compns. Experimental studies showed that counterion binding to micelles is less for oxafluorocarbon than for hydrocarbon surfactants.

Key words: SURFACTANTS, SURFACES ADSORPTION, MIXED SOLTION, HYDROCARBAN