Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 7, Pages 4275-4282Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5085012
Keywords
superhydrophobic materials; durable drag reduction; mechanical stability; Water adhesive force
Funding
- NSFC [21374006, 51422302]
- Program of the Co-Construction with Beijing Municipal Commission of Education of China
- Fok Ying Tung Education Foundation [131013]
- Open Project of State Key Laboratory of Supramolecular Structure and Materials [SKLSSM201501]
- Beijing Young Talents Plan [YETP0488]
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The durability of superhydrophobic surface is a major problem to restrict industrial application of superhydrophobic materials from laboratory research, which can be attributed to a more general issue of mechanical stability for superhydrophobic coatings. Therefore, in order to handle this issue, we have fabricated a mechanically stable drag-reducing coating composed of elastic polydimethylsiloxane (PDMS) and hydrophobic copper particles on model ships, which can resist mechanical abrasion and has displayed a durable drag-reducing effect. In comparison with normal Au superhydrophobic coatings, the as-prepared PDMS/copper coatings showed durable drag reduction performance with a similar drag-reducing rate before (26%) and after (24%) mechanical abrasion. The mechanism for the enhanced mechanical stability and maintained drag reduction of the superhydrophobic surfaces was investigated through characterizations of surface morphology, surface wettability, and water adhesive force evaluation before and after abrasion. This is the first demonstration to realize the application of durable drag reduction by improving the mechanical stability of superhydrophobic coatings. We do believe that superhydrophobic surfaces with good resistance to mechanical abrasion or scratching may draw wide attention and gain significant applications with durable drag-reducing properties.
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