The Gibbs adsorption equation (2.17) for two surface-active solutes in dilute [Pg.96]

Therefore, the concentration of each surfactant at the interface can be calculated from the slope of a y-ln C (or log C) plot of each surfactant, holding the solution concentration of the other surfactant constant. [Pg.96]

When the absolute concentrations of the surfactants at the interface are not required, but only their relative concentrations, i.e., their relative effectiveness of adsorption, then these can be obtained in convenient fashion by use of non-ideal solution theory. [Pg.96]

From the thermodynamics of the system, it has been shown (Rosen and Hua, 1982) that the molar concentrations of the two surfactants in the solution phase are given by the expressions [Pg.96]

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