Abstract
Miscibility of components in the adsorbed film for the n-butanol (NBA)–dodecyltrimethylammonium chloride (DTAC) andtert-butyl alcohol (TBA)–DTAC mixtures were investigated by measuring surface tension of the aqueous solutions. The experimental results were analyzed thermodynamically. Diagrams of the excess Gibbs energy in the adsorbed filmĝH,Evs the composition in the adsorbed filmX̂H2were obtained from the phase diagrams of adsorption. TheĝH,Evalues of the NBA–DTAC system are more negative than those of the TBA–DTAC system. It is concluded that the molecular interaction between NBA and DTAC is stronger than that between TBA and DTAC. With respect to the mean molar area in the adsorbed filmAvsX̂H2curve at a fixed surface tension γ, the criterion of ideal mixing is demonstrated to be a straight line connecting the pure values. TheAvsX̂H2curves are convex downward in both systems and the deviation from the straight line is attributed to the dependence ofĝH,Eon γ.
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