Robust superhydrophobic surface fabrication by fluorine-free method on filter paper for oil/water separation |
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Institution: | 1. Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China;2. Hangzhou Research Institute of Chemical Technology Co., Ltd., Hangzhou 310014, China;3. Department of Chemical Engineering & Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton E3B 5A3, Canada;1. Research Institute of Food Safety, Kunming University of Science and Technology, Kunming 650600, China;2. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China;3. School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430060, China |
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Abstract: | Robust superhydrophobic surface exhibiting anti-fouling and self-cleaning ability were successfully fabricated by nano TiO2 modified by γ-aminopropyltriethoxysilane (KH550) and polydimethylsiloxane (PDMS) via wire rod coating. Due to the lower surface energy of PDMS and the hierarchical structure caused by the different aggregation sizes of TiO2 nanoparticles, the contact angle of the resulting superhydrophobic coating was 154.5° and the rolling angle was 3.5°. And the coated paper still had good non-wettability under water immersion. In addition, the coated paper was tolerant to mechanical damage and various temperature conditions. Even after 40 sandpaper wear cycles, the coating can still maintain good mechanical stability and superhydrophobicity. The superhydrophobic paper was used for oil-water separation, the separation efficiency was about 98% even after used 10 times. Furthermore, the prepared superhydrophobic paper exhibited excellent self-cleaning and anti-fouling properties, as well as demonstrated superb resistance to various water solutions owing to its high hydrophobicity. Moreover, the prepared superhydrophobic paper has application prospects in the industry of special wetting materials. |
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Keywords: | Fluorine-free Superhydrophobicity Paper substrate Robust Oil/water separation |
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