Fabrication of a superhydrophobic and high-glossy copper coating on aluminum substrates
Abstract Superhydrophobic metal coatings have been extensively studied in recent years because of their significant potential applications. Unfortunately, most of them lost the original metallic luster due to the micro/nano binary structures. In this paper, a facile method was developed to prepare a superhydrophobic and high-glossy copper coating on aluminum substrates. The bionic lotus leaf surfaces were constructed by electroless plating method and further modified with octadecanethiol. The wettability and gloss could be tuned by the concentration of the precursor. With the increase of CuSO 4 concentration, the surface roughness of the coating raised, thus resulting in increase of contact angle and decrease of glossiness. When the CuSO 4 concentration was 30mmol/L, the coating exhibited a sub-micro/nano binary structure, in which 20–30nm protuberances were grown on 300–500nm mastoids. Such special morphology endowed the coating with superhydrophobic and high-glossy properties, and the coating also showed ultra-low water adhesion and stable dynamic water repellence. Highlights The copper coating showed superhydrophobicity with water contact angle over 150°. The copper coating showed high-gloss with glossiness over 100 GU. The copper coating exhibited a sub-micro/nano binary structure. The copper coating showed low water adhesion and stable dynamic water repellency. Graphical abstract The copper coating on aluminum substrates showed superhydrophobic and high-glossy properties owning to the sub-micro/nano binary structure similar to the topography of lotus leaf. The coating also exhibited ultra-low water adhesion and stable dynamic water repellence. [DISPLAY OMISSION]
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