Abstract
Even when a liquid is perfectly wetting on a smooth substrate (zero Young's angle), it can manifest finite contact angles if evaporating. These angles are of a dynamic, evaporation-induced nature, a compromise between the tendencies to spread and to evaporate. They form as a result of the resolution of a macroscopic evaporation-flux singularity at a microscopic scale in a tiny vicinity of the contact line referred to as the microregion. A critical evaluation generalizes and unifies the various models thereof, for nonpolar liquids undergoing diffusion-limited evaporation into air, and compares them with experiment.
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