Abstract
The surface free energies of two series of mixtures have been determined indirectly from contact angle measurements and compared with values of the critical surface tension. The values of critical surface tension vary with the liquids used for the determination. For an ideal mixture of spherical particles, the surface free energy values obtained change in a regular manner with mixture composition. For a pharmaceutical system, this was not the case and may be a reflection of the preferential adsorption of one component on the other. The values should, however, represent a value for the mixture as it is used.
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