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When placed on rough hydrophobic surfaces, water droplets of diameter largerthan a few millimeters can easily form pearls, as they are in the Cassie-Baxterstate with air pockets trapped underneath the droplet. Intriguingly, a naturalevaporating process can drive such a Fakir drop into a completely wetting(Wenzel) state. Our microscopic observations with simultaneous side and bottomviews of evaporating droplets upon transparent hydrophobic microstructureselucidate the water-filling dynamics and the mechanism of thisevaporation-triggered transition. For the present material the wettingtransition occurs when the water droplet size decreases to a few hundreds ofmicrometers in radius. We present a general global energy argument whichestimates the interfacial energies depending on the drop size and can accountfor the critical radius for the transition.

Evaporation-triggered Wetting Transition for Water Droplets upon Hydrophobic Microstructures