Abstract
This chapter describes numerous surface activity coefficients with adsorption at the solid/solution interface and their relationship with surface tension. The chapter describes a study in which the adsorption of n–heptane from mixtures with cyclohexane at temperatures of 283.15 K and 343.15 K showed that at both temperatures, r =1.42 and a B S =2.41 × 10 5 m 2 /mol. At the lower temperature, K = 1.93, and as the solution thermodynamic data indicates a pseudo ideal solution, the model curve is independent of t. While, at the higher temperature, K = 1.31, and although the solution is non-ideal, the deviations from ideality are small. For all systems, the experimental surface tension is less than that of the model surface tension with surface activity coefficients having the same concentration dependence as the bulk activity coefficients (t = 1).
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