Abstract
A method for the estimation of the critical surface tension of wetting of solids (γ c) is demonstrated using MoS 2, S o, oil shale, teflon, and MoS 2-SiO 2 mixtures ground together. The method consists of obtaining percent recovery (%r) versus liquid surface-tension (γ LV) plots and extrapolating the curve to %r = 0. Good correlation between the method of Zisman using contact-angle measurements and the present flotation technique were established. γ c values for MoS 2, S o, and teflon were found to be 26, 31.5 and 20.5 dyn cm −1, respectively. The γ c of oil shale depended on its organic-carbon content. It was also observed that although SiO 2 ground together with MoS 2 is only partly covered with specs of the latter mineral, the γ c of the new composite material obtained approaches that of HoS 2.
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