Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.136103
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Funding
- ONR [N000141110503]
- NSF [1336966]
- Directorate For Engineering [1336966] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [1336966] Funding Source: National Science Foundation
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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 micro-structured 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.
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