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. 2015 Aug 4;6:7891. doi: 10.1038/ncomms8891

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(a) Equilibrium deformation by a three-phase contact line, inducing a solid contact angle θ_s. The liquid contact angle is denoted θ. (b) Growth of the ‘wetting ridge' after a drop is deposited. (c) Contact line moving at a velocity V. The motion induces a rotation of the wetting ridge and the liquid contact angle, while θ_s remains constant. (d) Dynamical depinning occurs at a critical angle .

Inline graphic — (a) Equilibrium deformation by a three-phase contact line, inducing a solid contact angle θ_s. The liquid contact angle is denoted θ. (b) Growth of the ‘wetting ridge' after a drop is deposited. (c) Contact line moving at a velocity V. The motion induces a rotation of the wetting ridge and the liquid contact angle, while θ_s remains constant. (d) Dynamical depinning occurs at a critical angle .