Construction of mechanically durable superhydrophobic surfaces by thermal spray deposition and further surface modification

•Thermal spray approach was employed for constructing superhydrophobic surfaces.•Vast inorganic materials can be sprayed for making the patterned base-structure.•Surface modification was made by applying a thin layer of PTFE.•The surfaces show excellent long-term mechanical stability. Here we report...

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Bibliographic Details
Published in:Applied surface science 2015-11, Vol.356, p.639-644
Main Authors: Chen, Xiuyong, Gong, Yongfeng, Suo, Xinkun, Huang, Jing, Liu, Yi, Li, Hua
Format: Article
Language:English
Subjects:
Abrasion resistance
Coatings
Construction costs
Contact angle
Droplets
Mechanical stability
Nanostructure
Polytetrafluoroethylene
Polytetrafluoroethylenes
Spray deposition
Superhydrophobicity
Thermal spraying
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Summary:•Thermal spray approach was employed for constructing superhydrophobic surfaces.•Vast inorganic materials can be sprayed for making the patterned base-structure.•Surface modification was made by applying a thin layer of PTFE.•The surfaces show excellent long-term mechanical stability. Here we report a simple and cost-effective technical route for constructing superhydrophobic surfaces with excellent abrasion resistance on various substrates. Rough surface structures were fabricated by thermal spray deposition of a variety of inorganic materials, and further surface modification was made by applying a thin layer of polytetrafluoroethylene. Results show that the Al, Cu, or NiCrBSi coatings with the surface roughness of up to 13.8μm offer rough surface profile to complement the topographical morphology in micro-/nano-scaled sizes, and the hydrophobic molecules facilitate the hydrophobicity. The contact angles of water droplets of ∼155° with a sliding angle of up to 3.5° on the samples have been achieved. The newly constructed superhydrophobic coatings tolerate strong abrasion, giving clear insight into their long-term functional applications.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.08.156