The surface tension components of aqueous alcohol solutions
Colloids and Surfaces, 36 (3):
391-403 (1989)DOI: 10.1016/0166-6622(89)80254-9
Abstract
Measurements of the contact angle were carried out in paraffin-drop of the aqueous alcohol solution-air systems for methanol, ethanol and propanol solutions in the whole range of their concentrations with special consideration of the low concentration range. On the basis of the results obtained the dispersion components of the surface tension of the solutions studied were determined. The dispersion components of the solution surface tension calculated from the contact angle were found to differ distinctly from those calculated from the interfacial tension of the alcohol solution-n-dodecane as well as from those calculated from Eqn (15). Using literature data concerning the properties of alcohols (methanol, ethanol and propanol) and n-dodecane molecules, the interaction parameters Φ were calculated, as well as the dispersion components of the surface tension of the alcohols mentioned above. These values of the dispersion component are in perfect agreement with those calculated from the alcohol-n-dodecane interfacial tension. It has been found that using the geometric-mean rule harmonic-mean rule and the parameter Φ of interfacial interactions it is possible to calculate the dispersion components of the alcohol surface tension, because the results obtained are, in principle, in good agreement. Knowing the interaction parameter Φ one may calculate the dispersion components of the surface tension of the solutions of two polar liquids from the equation derived by us earlier.