’sequation:cosθ=(γSV–γSL)/γLVHydrophobic:θ›90°;Hydrophilic:θ‹90°.(WCA)largerthan150°andextremelylowWCAhysteresisorslidinganglelessthan10°.(sinα)/ω=γ(cosθa-cosθr)θa–Advancingcontactangle,θr–Recedingcontactangle,m-Thequalityofwaterdrop,g-Accelerationofgravity,ω-Diameterofwaterdrop,γ-SurfaceEnergyofwaterdrop。m,g,ω,γareconstant,then:sinα∝cosθa–. .
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