Infinite lifetime of underwater superhydrophobic states
- Author(s): Xu, M
- Sun, G
- Kim, CJ
- et al.
Published Web Locationhttps://doi.org/10.1103/PhysRevLett.113.136103
© 2014 American Physical Society. Submerged superhydrophobic (SHPo) surfaces are well known to transition from the dewetted to wetted state over time. Here, a theoretical model is applied to describe the depletion of trapped air in a simple trench and rearranged to prescribe the conditions for infinite lifetime. By fabricating a microscale trench in a transparent hydrophobic material, we directly observe the air depletion process and verify the model. The study leads to the demonstration of infinite lifetime (>50 days) of air pockets on engineered microstructured surfaces under water for the first time. Environmental fluctuations are identified as the main factor behind the lack of a long-term underwater SHPo state to date.