Interfacial Activity of Trioctyloamine in Hydrocarbon/Water Systems with Nonorganic Electrolytes

Estimation of Trioctylphosphine Oxide (TOPO) Diffusion Coefficients by Dynamic Adsorption Measurements in Model Extraction Systems

“…This effect is observed in both diluents considered but strongly in the case when nonsolvating octane is used as the organic solvent. The higher the concentration of nitric acid in the aqueous phase, the lower the interfacial concentration of TOPO at the saturated hydrocarbon/water interface, which is the same tendency we observed in our laboratory previously, when the interfacial activity of trioctylamnie (TOA) in acidic and nonacidic systems was considered (35). Probably, in the presence of HNO 3 in the aqueous phase the TOPO molecules are adsorbed at the interface to a substantial degree in the form of TOPO · HNO 3 adducts, which occupy a larger surface than TOPO bound to H 2 O.…”

Effect of Sodium Chloride on the Surface and Wetting Properties of Aqueous Solutions of Cocamidopropyl Betaine

“…Using the Szyszkowski adsorption coefficients A Sz , B Sz , the surface excess at the saturated interface (Γ ∞ ), the minimum molecular area in the adsorption layer at the saturated interface ( A min ) and the Gibbs free energy of adsorption (Δ G ads ) could be estimated [28]. On the other hand, the Szyszkowski isotherm does not take into consideration the mutual interactions between the adsorbed molecules, therefore, the Frumkin isotherm might be more suitable for describing the experimental data as it does introduce such interaction.…”

Adsorption at the liquid/liquid interface in mixed systems with hydrophobic extractants and modifiers 1. Study of equilibrium interfacial tension at the hydrocarbon/water interface in binary mixed systems

“…We should like to emphasize that the observed higher interfacial activity for both the studied compounds in systems with nonsolvating octane is typical of hydrophobic substances. This problem was described previously in our papers [14].…”

“…The adsorption coefficients of the Szyszkowski isotherm enabled the estimation of the surface excess at the saturated interface (Γ ∞ ), the minimum molecular area occupied by a statistical molecule at the saturated interface (A min ), and the Gibbs free energy of adsorption ( G ads ). These values were calculated in the same way as described previously [14].…”