Abstract
The contact angle,θ, formed by a liquid on a solid surface in air depends on the solid-air (γ S ), liquid-air (γ L ) and solid-liquid (γ SL ) interfacial free energies, as described by Young's equation. Critical examination of reported contact angles for numerous liquids and solids leads to an empirical correlation betweenγ sL and bothγ Y andγ S . Combination of this correlation with Young's equation gives an empirical relation allowing calculation ofγ S fromγ L andθ Calculations made with these empirical relations agree well with estimations ofγ S obtained by the method of critical spreading, and are consistent with Young's equation.
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Founded and supported by F. Hoffmann-La Roche and Co., Limited Company, Basel, Switzerland.
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Gerson, D.F. An empirical equation-of-state for solid-fluid interfacial free energies. Colloid & Polymer Sci 260, 539–544 (1982). https://doi.org/10.1007/BF01453004
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DOI: https://doi.org/10.1007/BF01453004