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The schematic shows the wetting of a solid surface. γLA, γLS, and γSA are the interfacial tensions at the boundaries between liquid (L), solid (S), and air (A), which determine the CA of an applied water droplet and is described by Young`s equation. The hysteresis of a water droplet on a tilted surface represents the adhesion of the liquid on the surface and can be determined by measuring the tilting angle or the advanced and receding angle of a water droplet
