Abstract
The thermodynamic equations were summarized for the adsorption of surfactants and surfactant mixtures from monomeric and micellar solution to the air/water and oil/water interfaces. The phase diagrams of adsorption and micelle formation were introduced and discussed for some examples such as ideal mixing, and nonideal mixing showing negative azeotrope and heteroazeotrope. Also the thermodynamic quantity changes associated with adsorption were shown and the effect of a coexistent oil phase was examined briefly. Furthermore the results of the adsorption of oil-soluble substances from an oil phase and the finding of the phase transition of adsorbed films were introduced.
