Evaporation-triggered wetting transition for water droplets upon hydrophobic microstructures.

Content Provider	Semantic Scholar
Author	Tsai, Peichun Amy Lammertink, Rob G. H. Wessling, Matthias Lohse, Detlef
Copyright Year	2010
Abstract	When placed on rough hydrophobic surfaces, water droplets of diameter larger than a few millimeters can easily form pearls, as they are in the Cassie-Baxter state with air pockets trapped underneath the droplet. Intriguingly, a natural evaporating process can drive such a Fakir drop into a completely wetting (Wenzel) state. Our microscopic observations with simultaneous side and bottom views of evaporating droplets upon transparent hydrophobic microstructures elucidate the water-filling dynamics and suggest the mechanism of this evaporation-triggered transition. For the present material the wetting transition occurs when the water droplet size decreases to a few hundreds of micrometers in radius. We present a general global energy argument which estimates the interfacial energies depending on the drop size and can account for the critical radius for the transition.
Starting Page	116102
Ending Page	116102
Page Count	1
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://doc.utwente.nl/79182/1/evaporation.pdf
PubMed reference number	20366488v1
Volume Number	104
Issue Number	11
Journal	Physical review letters
Language	English
Access Restriction	Open
Subject Keyword	Diameter (qualifier value) Energy, Physics Estimated Large Leucaena leucocephala evaporation millimeter
Content Type	Text
Resource Type	Article