Synergism between non-ionic and cationic surfactants in a concentration range of mixed monolayers at an air–water interface

The mole fractions of TX100 ( X s1) and C 16 PC ( X s2) at the interface vs. the total surfactant concentrations in the pre-micellar region, C 12 , at various bulk mole fractions ( y 1 ): (●) 0.1093, (□) 0.1995, (▲) 0.2901, (+) 0.3777 (*) 0.5001 and (○) 0.5972.