Nov 03, 2015 · cos θ = γ sv − γ sl γ lv, (1) where γsv, γsl, and γlv are the solid–vapor, solid–liquid, and liquid–vapor surface tensions, respectively, and θ is the contact angle, Fig. 2 (a). For water, contact angles <90° and the surface is considered hydrophilic, whereas surfaces exhibiting angles >90° are hydrophobic. The corresponding ...
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