Preparation of superhydrophobic coatings on zinc, silicon, and steel by a solution-immersion technique.

ACS applied materials & interfaces (2010-04-02)
Hongqin Liu, Sabine Szunerits, Marcin Pisarek, Wenguo Xu, Rabah Boukherroub
RESUMO

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 [CF(3)(CF(2))(5)(CH(2))(2)SiCl(3), PFTS] for 24 h at 50 degrees C. Micron-sized spheres (1.7-2 microm 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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Zinc, foil, 100x100mm, thickness 0.1mm, as rolled, 99.95+%
Zinc, foil, 300x300mm, thickness 0.20mm, as rolled, 99.95+%
Zinc, foil, 300x300mm, thickness 0.1mm, as rolled, 99.95+%
Zinc, foil, 1m coil, thickness 0.05mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 0.125mm, as rolled, 99.95+%
Zinc, foil, 150x150mm, thickness 0.25mm, as rolled, 99.95+%
Zinc, foil, 150x150mm, thickness 0.35mm, as rolled, 99.95+%
Zinc, foil, 25x25mm, thickness 0.125mm, as rolled, 99.95+%
Zinc, foil, 50mm disks, thickness 0.05mm, as rolled, 99.95+%
Zinc, foil, 50x50mm, thickness 0.25mm, as rolled, 99.99+%
Zinc, foil, 0.5m coil, thickness 0.05mm, as rolled, 99.95+%
Zinc, foil, light tested, 150x150mm, thickness 0.05mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 0.125mm, as rolled, 99.99+%
Zinc, foil, 100x100mm, thickness 0.15mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 0.175mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 0.20mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 0.25mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 0.25mm, as rolled, 99.99+%
Zinc, foil, 100x100mm, thickness 0.35mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 0.5mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 0.5mm, as rolled, 99.99+%
Zinc, foil, 100x100mm, thickness 1.0mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 1.0mm, as rolled, 99.99+%
Zinc, foil, 100x100mm, thickness 1.5mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 2.0mm, as rolled, 99.95+%
Zinc, foil, 100x100mm, thickness 3mm, as rolled, 99.99+%
Zinc, foil, 100x100mm, thickness 6mm, as rolled, 99.99+%
Zinc, foil, 100x100mm, thickness 6mm, as rolled, polished on both sides, 99.99+%
Zinc, foil, 150x150mm, thickness 0.125mm, as rolled, 99.95+%
Zinc, foil, 150x150mm, thickness 0.15mm, as rolled, 99.95+%