Superhydrophobic dual-sized filler epoxy composite coatings

We propose an accessible method of superhydrophobic coating fabrication, in the form of an epoxy resin composite with hard nano- and microfillers, combined with surface sandblasting and wet chemical hydrophobization. The fillers – glass microbeads and Al2O3 nanoparticles, dispersed in the bulk compo...

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Bibliographic Details
Published in:Surface & coatings technology 2013-06, Vol.225, p.66-74
Main Authors: Psarski, Maciej, Celichowski, Grzegorz, Marczak, Jacek, Gumowski, Konrad, Sobieraj, Grzegorz B.
Format: Article
Language:English
Subjects:
Applied sciences
Composite coating
Cross-disciplinary physics: materials science
rheology
Erosion
Exact sciences and technology
Hierarchical roughness
Materials science
Metals. Metallurgy
Nonmetallic coatings
Physics
Production techniques
Sandblasting
Superhydrophobicity
Surface treatment
Surface treatments
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Summary:We propose an accessible method of superhydrophobic coating fabrication, in the form of an epoxy resin composite with hard nano- and microfillers, combined with surface sandblasting and wet chemical hydrophobization. The fillers – glass microbeads and Al2O3 nanoparticles, dispersed in the bulk composite – provide a dual-sized roughness, if exposed on the surface. Sandblasting with corundum particles and subsequent air plasma etching exposes and enhances the micro- and nano-scale roughness, while wet chemical modification with 1H,1H,2H,2H-perfluorodecyltrichlorosilane reduces surface free energy to the level required for superhydrophobic materials. The coatings exhibit superhydrophobic behavior, with water contact angle of 152° and contact angle hysteresis of 8°. Hierarchical surface structure of coatings is preserved after erosive wear tests and superhydrophobicity is restored upon re-hydrophobization. •Lotus-like structure in sandblasted epoxy/micro-/nanofiller composite•Surface hydrophobization with trichlorosilane leads to superhydrophobic behavior.•Erosion resistant surface topography, superhydrophobicity restored upon re-hydrophobization
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2013.03.017