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Although realizing wetting transitions of droplets spontaneously on solidrough surfaces is quite challenging, it is becoming a key research topic inmany practical applications which require highly efficient removal of liquid.We report wetting transitions of condensed droplets occurring spontaneously onpillared surfaces with two-tier roughness owing to excellentsuperhydrophobicity. The phenomenon results from further decreased Laplacepressure on the top side of the individual droplet when its size becomescomparable to the scale of the micropillars, which leads to a surprising robustspontaneous wetting transition, from valleys to tops of the pillars. A simplescaling law is derived theoretically, which demonstrates that the critical sizeof the droplet is determined by the space of the micropillars. For this reason,highly efficient removal of water benefits greatly from smaller micropillarspace. Furthermore, three wetting transition modes exist, in which the in situwetting behaviors are in good agreement with our quantitative theoreticalanalysis.

Wetting Transitions of Condensed Droplets on Superhydrophobic Surfaces with Two-Tier Roughness