Abstract
Measurements were made of contact angles of air bubbles on the hydrophobic solid surface of sulphur, graphite and Teflon in aqueous solutions of methanol, ethanol and propanol. Special attention was given to the measurements at low alcohol concentrations. The greatest changes in contact angle values as a function of alcohol concentration were observed at small alcohol concentrations, where changes in the solution surface tension were small. On this basis it is concluded that polar interactions between alcohol molecules in solution and those already adsorbed are important in defining the wetting properties of the hydrophobic solid under these conditions. The calculations based on the equation of Good, Girifalco, Fowkes and Young and Tamai et al. seem to verify the above conclusion.
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