Abstract
Contact-angle measurements for water, glycerol, formamide, di-iodomethane and bromoform on fluorite plates covered with a film of oleate are made. Using the contact-angle values, the Lifshitz-van der Waals component and the electron-acceptor parameter of the surface free energy of the fluorite/oleate film are calculated. On the basis of the contact-angle measurements and the calculations done, it is found that at low equilibrium oleate concentration the surface free energy of the fluorite/oleate film comes close to the value for paraffin, however at high oleate concentration, the surface of the fluorite/oleate film can interact with the adherent phase not only by Lifshitz-van der Waals forces but also by acid-base forces. It results from a hydration process which takes place at the highest sodium oleate concentrations. It is stated that the considerable decrease of the fluorite/oleate- film-water interfacial free energy at oleate species concentration higher than 87.1 mg/ dm 3 can also result from electrostatic interactions across the interface.
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