Water and Ethanol Droplet Wetting Transition during Evaporation on Omniphobic Surfaces.

ABSTRACT: Omniphobic surfaces with reentrant microstructures have been investigated for a range of applications, but the evaporation of high- and low-surface-tension liquid droplets placed on such surfaces has not been rigorously studied. In this work, we develop a technique to fabricate omniphobic surfaces on copper substrates to allow for a systematic examination of the effects of surface topography on the evaporation dynamics of water and ethanol droplets. Compared to a water droplet, the ethanol droplet not only evaporates faster, but also inhibits Cassie-to-Wenzel wetting transitions on surfaces with certain geometries. We use an interfacial energy-based description of the system, including the transition energy barrier and triple line energy, to explain the underlying transition mechanism and

SUBMITTER: Chen X 

PROVIDER: S-EPMC4658527 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature