Wetting films |
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| Institution: | 1. Department of Chemical and Process Engineering, University of Surrey, Guildford, GU2 7XH;2. Institute of Pharmaceutics and Biopharmaceutics, Heinrich Heine University, Germany;3. Pharmaceutical Technology & Development, AstraZeneca, Macclesfield, UK |
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| Abstract: | Wetting films of nonpolar liquids are stabilized due to action of the repulsion dispersion forces. For aqueous films, it is necessary to takes additionally into account action of electrostatical and structural forces.Disjoining pressure isotherms of a thick methastable β -films of electrolyte and surfactant solutions can be quantitavely described on the basis of theory of long-range electrostatical forces. Thicknesses of thinner α-films of water formed as a result of vapour adsorption depend on the surface hydrophilicity and are controlled by the action of structural repulsion forces. |
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