Abstract
Wetting of solids bу various surfactant solutions was investigated by the contact angle measurements. The results were analyzed using an approximation that the surfactant solutions have intrinsic dispersion (D) and polar (P) surface forces, analogous to solids and pure liquids. Using this approach gave the same value for the solid surface tension (i. e. the dispersion and the polar forces), when two different surfactant solutions were used. It is shown for the first time that the degree of wetting (as related to the magnitude of the contact angle) of a solid by different surfactant solutions arises from the differences in the surface tensions arising from the dispersion and the polar forces of the latter (under these assumptions).
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