Abstract
Superhydrophobicity is the phenomenon of which the water contact angle (WCA) of droplets on a solid surface is greater than 150°. In the present paper, we prepare a superhydrophobic film with a structure similar to the surface of a lotus leaf, which is composed of polydimethylsiloxane (PDMS), zinc oxide (ZnO), a molecular sieve (MS) and 1,2,3,4,8,9,10,11,15,16,17,18,22,23,24,25-hexadecafluorophthalocyanine copper(II) (F16CuPc). The F16CuPc was used as the modifier to reduce the surface energy of the biomimetic micro-nanostructure. With the introduction of F16CuPc, the superhydrophobic properties of the surface were enhanced so that the WCA and water roll-off angle could reach 167.1° and 0.5°, respectively. Scanning electron microscopy, X-ray energy spectrometry, and X-ray photoelectron spectroscopy analyses verified that the enhanced superhydrophobic properties of the film were mainly attributed to the modification of F16CuPc. Finally, thermal, mechanical, and chemical stability studies, as well as the influences of UV and underwater immersion on the superhydrophobic film were investigated. This developed two-step fabrication method may be a potential direction for superhydrophobic surface fabrication due to its simple process, excellent superhydrophobic property, and favorable stability.
Highlights
The water droplets show a complete rebound when dropping on the surface of the F16 CuPc-modified biomimetic superhydrophobic film, indicating that there is subtle adhesion between the surface and the water droplets. These results demonstrate that the F16 CuPc-modified biomimetic superhydrophobic film has excellent dynamic wettability, which can be attributed to the introduction of the F16 CuPc modifier
The water droplets show a complete rebound when dropping on the surface of the F16CuPc-modified biomimetic superhydrophobic film, indicating that there is subtle adhesion between the surface and the water droplets. These results demonstrate that the F16CuPc-modified biomimetic superhydrophobic film has excellent dynamic wettability, which can be attributed to the introFigure 4
The F16 CuPc was firstly used as the modifier to increase the water contact angle (WCA) of the
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The molecular sieves (MSs), with a carved hexahedron the size on the micron level [16–18], have been widely investigated as catalysts, gas separation, and adsorbents This micro structure is suitable to construct the rough substrate for the superhydrophobic surface. The mixed solution of MS, ZnO, and PDMS was spin-coated and a stacked substrate was constructed This stacked substrate presented a two-level biomimetic lotus-leaf structure and exhibited excellent superhydrophobic properties. The optimized WCA and WRA demonstrated the superiority of the F16 CuPc serving as the modifier to improve the superhydrophobic properties of the stacked substrate. The results demonstrate that the modified biomimetic superhydrophobic films have excellent physical and chemical stability This simple fabrication process can be widely applied in ceramics, glass, metal, and other surfaces
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