By R Ottewill (Eds.)

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S 56 LANE 3 . RESULTS In all of the following diagrams, the experimental data are represented by open circles. The broken curves indicate the model predictions with t = 1 , the dotted curves t = 0 , and the full curves the best fitting value of t. The best fit is obtained by treating t as a parameter and minimizing the sum of the squares of the differences between model and experimental data. Fig. 1. 15 K. Figs. 1 and 2 respectively show the concentration dependence of surface tension and adsorption for mixtures of cyclohexane (A) and carbon tetrachloride (B) at a temperature of 2 9 8 .

Clausius-Clapeyron type expressions are derived which relate differential and integral enthalpies of adsorption to the temperature dependence of the adsorption equilibria concerned. The differential enthalpies refer to the transfer of material from bulk to adsorbed states under the condition that nonspecifically adsorbed material is allowed to re-equilibrate. The integral enthalpies refer to the enthalpy of formation of the interface from the bulk solution at constant interfacial and bulk intensive properties.

1 x 1 0 m / m o l , and by using equation ( 1 3 ) K = 1 . U 8 .

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