Abstract
The surface tension isotherms were measured for homologous series of alkyl dimethyl phosphine oxides using different experimental techniques: maximum bubble pressure technique, drop volume technique and ring tensiometry. The adsorption data obtained for the surfactants with hydrocarbon chains from 8 to 16 alkyl groups are interpreted by a reorientation isotherm assuming two possible partial molar surface areas of surfactant molecules, i.e. states with maximum ( ω 1) and minimum ( ω 2) surface area. The lower homologues ( n⩽13) of C n DMPO do not adsorb in the state with the large molar area, while the molecules with long alkyl chains ( n⩾14) adsorb in both states. The area values determined from the experimental isotherms agree well with those calculated from the molecular geometry.
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