Journal
TRIBOLOGY INTERNATIONAL
Volume 119, Issue -, Pages 131-142Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2017.10.021
Keywords
Dual-scale hierarchical structure; Air lubrication; Cassie wetting state; Friction coefficient
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Funding
- National Natural Science Foundation of P.R. China [51405350]
- China Postdoctoral Science Foundation of PR China [2015T80841, 2014M560630]
- International Postdoctoral Exchange Fellowship Program [20160050]
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In this study, a new method to fabricate biomimetic engineering surfaces with lotus leaf-like hierarchical microstructures is explored. Contact angle tests were performed to study the influences of the structures on the surface hydrophobic properties. Air lubrication resulted in hydrophobicity and consequently reduced the liquid solid contact. The superior lubrication behaviour of a biomimetic hierarchical surface was observed by tribology experiments. Simulation results indicated that by improving hydrophobicity, the frictional drag was reduced by a significant amount because of the large fraction of air. It was found that introducing the superposition of microscale hemispherical papillae and branch-like nanostructures has a dramatic positive effect in reducing frictional drag results because 99% of liquid-solid interface was replaced by air-liquid interface.
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