Superhydrophobic surfaces were prepared on copper foils via a facile assistant surface oxidation technology and subsequent chemical modification with low free energy materials. The three-dimensional (3D) honeycomb-like porous structures made up of nanoslices of hydroxy cupric phosphate heptahydrate (Cu 8 (PO 3 OH) 2 (PO 4 ) 4 • 7H 2 O) single crystals were constructed by immersing copper foil in an aqueous solution of phosphoric acid and hydrogen peroxide. The pore size of the 3D structure ranges from hundreds of nanometers to two micrometers, and the thickness of the two-dimensional (2D) nanoslices is about 50-100 nm. The wettability of the porous surfaces was transformed from superhydrophilic to superhydrophobic by chemical modification with octadecanethiol (ODT) or 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PDES). It was found that the 3D porous structures of the surfaces helped to amplify the wettability. The resulting static contact angles (CAs) for water were larger than 160°on both of the modified surfaces. Compared with the surface modified with ODT, the PDES-modified surface has lower contact angle hysteresis (CAH) for water droplets. It should provide new insight to prepare novel multifunctional materials with potential industrial applications such as corrosion prevention, drag reduction, self-cleaning, and so forth.
Pured ZnO, Al doped ZnO and Al-In co-doped ZnO nanopowders were synthesized by the methanol alcoholysis method at 130 °C. Structure, morphology and optical properties of ZnO nanopowders were characterized using X-ray diffraction, Transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and Photoluminescence (PL) spectra. The results show that ZnO nanopowders can be obtained in methanol solution at low temperature (130 °C). TEM images show that Al doped ZnO nanocrystals grow along the [002] axis quicker than other axes. FTIR spectra show that ZnO nanocrystals synthesized by the methanol alcoholysis include a little organic impurity. PL spectrums reveal that pure ZnO and doped ZnO nanocrystals have a blue band emission at 440 nm and a green band emission at 520 nm and 530 nm, respectively. Compared with the pure ZnO nanocrystal, the Al doping improves the luminescent properties.
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