Abstract
Abstract A theoretical relation between the fractional adsorption amount, θ, and the concentration, C, taking account of the lateral interaction between the adsorbed molecules is used to integrate the Gibbs equation, and the relation between the surface pressure, F, and the molecular area, A, is derived. Since the equation does not contain the parameter, k0, related to the strength of adsorption, it is concluded that there is no substantial difference between the adsorption monolayers and the insoluble monolayers. The relation between F and C is also derived and compared with the experimental data for normal alcohols. The standard affinity of adsorption, −Δμ0, and the energy of lateral interaction, ε, increased linearly with the number of carbon atoms of the alcohols, n. Finally, it has been shown that the experimental data can be explained well with the theoretical equation presented here, but not with Szyszkowski’s, the latter being derived for negligible lateral interaction.
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