Abstract
Abstract The critical micelle concentrations (CMC) of mixtures of nonionic surfactants with the same hydrocarbon, i.e. dodecyl group, and with various chain lengths of ethylene oxide, were determined. The observed values were compared with the values calculated by means of the equation derived from the pseudo-phase separation model on the assumption that the mixed micelle is a perfect solution. A good agreement between observed and calculated values was obtained in the mixtures of the surfactants with six or more ethylene-oxide units. However, the observed values of the two-component mixture, one component with five ethylene-oxide units, showed a small deviation from the calculated values. The difference between the above two cases was explained from the viewpoint of the most suitable packing of the first six or fewer ethylene-oxide units near the micelle core in the micelle state.
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