Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 1, Issue 9, Pages 2086-2091Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am900488w
Keywords
superhydrophobic coating; zinc; silicon; steel; solution immersion
Funding
- Centre National de la Recherche Scientifique (CNRS)
- Nord Pas de Calais region
- China Council
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Zinc, silicon, and steel superhydrophobic surfaces were prepared by a simple solution-immersion technique. In the case of zinc, the method consists of dipping of the substrate in a prehydrolyzed methanol solution of 1H, 1H,2H,2H-(perfluorooctyl)-trichlorosilane [CF3(CF2)(5)(CH2)(2)SiCl3, PFTS] for 24 h at 50 degrees C. Micron-sized spheres (1.7-2 mu m in diameter) were formed on the zinc substrate at 50 degrees C, while a featureless coating was obtained when the solution-immersion process was conducted at room temperature. When the reaction was performed at room temperature, the formation of superhydrophobic coatings took several days (up to 5 days). In contrast, immersion of silicon or steel substrates in the PFTS/methanol solution led to the formation of hydrophobic interfaces, even for a prolonged immersion period at 50 degrees C. The Formation of superhydrophobic surfaces on silicon and steel surfaces was only possible if a zinc foil was added in the PFTS/methanol solution containing the silicon or steel substrate. X-ray photoelectron spectroscopy analysis was used to characterize the resulting surfaces and to underline a plausible reaction mechanism.
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