Fractal applications: Wettability and contact angle

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142 Citations (Scopus)


A theromodynamic expression is derived fro the equilibrium contact angle on fractal surfaces in which the welted surface area is a function of the contacting fluid. The correlation for fractal surfaces can be decomposed into an areal contribution analogous to Wenzel's roughness ratio, which alway enhances the natural wettability characteristics of the material, and a wettability alteration factor due to fluid adsorbate size differences. Reported fractal properties of reservoir materials suggest that for most fluid pairs, such porous media will appear perfectly wetted by one of the fluids. Fractional and mixed wettability states are not prohibited by the theory but exist as combinations of perfectly wetting and perfectly nonwetting domains.

Original languageEnglish
Pages (from-to)527-533
Number of pages7
JournalJournal of Colloid and Interface Science
Issue number2
Publication statusPublished - Jul 1990
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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