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Robust and superhydrophobic surface modification by a "paint+adhesive" method: applications in self-cleaning after oil contamination and oil-water separation.

Research paper by Baiyi B Chen, Jianhui J Qiu, Eiichi E Sakai, Nobuhiro N Kanazawa, Ruilu R Liang, Huixia H Feng

Indexed on: 11 Jun '16Published on: 11 Jun '16Published in: ACS Applied Materials & Interfaces



Abstract

Conventional superhydrophobic surfaces have always depended on expensive, sophisticated and fragile roughness structures. Therefore, poor robustness has turned into the bottle neck for large-scale industrial applications of the superhydrophobic surfaces. To handle this problem, superhydrophobic surface with firm robustness urgently need to be developed. In this paper, we created a versatile strategy to fabricate robust, self-cleaning and superhydrophobic surfaces for both soft and hard substrates. We created an ethanol based suspension of perfluorooctyltriethoxysilane-mdodified calcium carbonate nanoparticles which can be sprayed onto both hard and soft substrates to form superhydrophobic surfaces. For all kinds of substrates, spray adhesive was directly coated onto abluent substrates surfaces to promote the robustness. These superhydrophobic surfaces showed remarkable robustness against knife scratch and sandpaper abrasion, while retaining its superhydrophobicity even after 30 abrasion cycles with sandpaper. What is more, the superhydrophobic surfaces have shown promising potential applications in self-cleaning and oil-water separation. The surfaces remained their self-cleaning property even upon contamination by oil. In addition to oil-water separation, the oil content in water after separation of various mixtures was all below 2344.7 ppm, and for toluene even as low as 54.8 ppm. Furthermore, the as-prepared device for oil-water separation can be cycled 6 times and still remained excellent oil-water separation efficiency.