Xueya Liu,Yingqin Wei,Furong Tao,Xue Zhang,Ligang Gai,Libin Liu
Superhydrophobic surfaces with reversible switchable wettability have great application value in the treatment of oily wastewater. However, the advancement of switchable wettability surfaces is limited by the complexity of the manufacturing process and the excessive use of environmentally unfriendly solvents. Herein, an all-water-based reversible wettability coating was fabricated by simply spraying a water suspension consisting of N-[3-(trimethoxysilyl) propyl] ethylenediamine (AS)-, 3-(trimethoxysilyl) propyl methacrylate (KH-570)-, and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS)-modified titanium dioxide (TiO 2 ) nanoparticles and cellulose . The coating possesses good adhesion with various substrates and exhibits stable mechanical and chemical stability as well as good resistance to harsh environments such as various organic solvents , strongly corrosive environments and extreme temperature environments. The coating can be switched between having superhydrophobicity (160°) and superhydrophilicity under UV irradiation and heating treatment. The coated cotton fabric can separate heavy/light oil-water mixtures and water-in-oil/oil-in-water emulsions with a high efficiency of greater than 95%. Due to the photocatalytic properties of TiO 2 , the coating can degrade soluble pollutants in water during UV irradiation, and the degradation efficiency is over 97%. This study provides a green industrial route for designing a simple, switchable wettability coating, which is expected to promote the large-scale industrial production and application of functional smart surfaces.
Construction of the superamphiphobic materials and their application is of particular interest both in academia and industrial circles for years. Herein, a novel coating system for fabricating superamphiphobic poly(ethylene terephthalate) (PET) fabrics was reported based on both aminopropyltriethoxysilane (APTES) and environment-friendly perfluorooctyltriethoxysilane (FAS) co-modified SiO 2 nano-particles, 3-Hydroxytyramine hydrochloride (Dopamine), amino-terminated silicone oils and etched PET fabrics via the one-step Schiff-base reaction and Michael addition reaction. The prepared fabrics displayed superamphiphobic properties, with contact angles of various liquids approaching 150°. In addition, the mechanical durability superamphiphobic fabrics were obtained, which were able to withstand 500 cycles of abrasion test, 20 cycles of sand abrasion test or 20 times standard washing. Furthermore, various liquids, including water and high viscous liquids, can easily slide off the surface of the obtained fabrics in a short time at a small angle. The prepared fabric can not only float on water or oil, but also hold up 25.7 times its own body weight things floated on water or 9 times on sesame oil without sinking. This novel and effective coating system can have more potential applications in the development of soft micro-devices working on liquid surfaces, especially on highly viscous liquid surfaces or under the environment with harsh conditions.
危险品化学品经营许可证（带存储）