Abstract
A superhydrophobic paper with excellent robustness was fabricated by roll coating with modified nano-TiO2. First, nano-TiO2 particles were hydrophobically modified by γ-aminopropyltriethoxysilane and 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS). Then the paper coating composed of modified nano-TiO2 particles as pigments and epoxy resin (EP) as adhesives was coated on a paper surface to create the desired surface morphology and surface energy. Compared with the uncoated filter paper, the prepared paper showed an improved rough surface morphology owing to the uniform layer of TiO2 microclusters deposited on the fiber network. The superhydrophobic paper exhibited water contact angles (WCA) about 153° ± 1.5°, and water sliding angles (WSA) about 3.5° ± 0.5°, low surface adhesion and excellent bounce ability. The superhydrophobic paper can withstand a variety of wear and tear, such as tape stripping and knife scraping. The as-prepared superhydrophobic paper showed mechanical durability even after 20 wear cycles with sandpaper,thus sustaining excellent superhydrophobicity on the filter paper surface. Moreover, it remains fully functional even in environments with high concentrations of acid and alkali for 96 h. The superhydrophobicity was not affected after storage for 6 months in a natural environment. It was confirmed that the superhydrophobic paper surface exhibited excellent chemical stability, long-term stability and self-cleaning properties. The entire production process was operated under normal environment, without complex equipment; and, as such, has the possibility for large-scale production and application in industry.
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Acknowledgements
We would like to thank the supports from State Key Laboratory of Pulp and Paper Engineering (201615), Science project of Wuqing Science and Technology Commission of Tianjin (WQKJ201833), and Science Project of Tianjin Municipal Education Commission (2017KJ031).
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Test of the bounce of water droplets from the superhydrophobic paper surface (Video Clip S1) (MP4 861 kb)
Tape peel and knife scratch testing (Video Clip S2) (MP4 2041 kb)
Self-cleaning properties testing (Video Clip S3) (MP4 1134 kb)
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Teng, Y., Wang, Y., Shi, B. et al. Facile fabrication of superhydrophobic paper with durability, chemical stability and self-cleaning by roll coating with modified nano-TiO2. Appl Nanosci 10, 4063–4073 (2020). https://doi.org/10.1007/s13204-020-01518-4
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DOI: https://doi.org/10.1007/s13204-020-01518-4