Abstract
The influence of the CH 2 group on the properties of mixed monolayers based on surface tension measurements of aqueous solutions of ethyl alcohol/acetic acid, methyl alcohol/propionic acid and ethyl alcohol/propionic acid was examined. The Gibbs adsorption equation, the regular solution approximation (RSA) and the Butler adsorption isotherm (BAI) were applied to calculate surface molar fractions of solutes. These independent methods gave consistent results for surface composition. Moreover, it was shown that simultaneous increases in hydrocarbon chain length of both solutes do not influence changes in their surface molar fractions. Additionally, determination of the interaction parameter (RSA) and calculation of the Gibbs free energy of adsorption of the components (BAI) allowed us to conclude that there is no significant interaction between solute molecules at the surface.
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