Fluorinated polyhedral oligomeric silsesquioxane (F-POSS) has been widely used for preparing liquid-repellent coatings. It is usually pre-synthesized and dispersed in expensive fluoro-solvent (or fluorosurfactant solution) for dip coating. Since the melting temperature of F-POSS is not high (122–140 °C), its loss during use is inevitable. However, reports on the grafting of F-POSS on substrate are rare. In this work, we report the fabrication of superhydrophobic and oleophobic cotton fabrics through the silane coupling of (heptadecafluoro-1,1,2,2-tetradecyl) trimethoxysilane (FAS) and 3-mercaptopropyltriethoxysilane (MPTES) on cotton fiber and the subsequent UV-induced thiol-ene click reaction between octavinyloctasilasesquioxane (OVPOSS) and MPTES thiols (and 1H, 1H, 2H, 2H-perfluorododecyl-1-thiol, PFDT). The as-prepared FAS/SH-F-POSS cotton fabric showed superhydrophobicity and high oleophobicity, as well as good durability and self-healing ability. It can withstand at least 15 accelerated washing cycles, 2000 abrasion cycles over sandpaper, 10 cycles of O 2 plasma etching , acid/alkaline/salt solution corrosion, and 25 cycles of UV aging/moist erosion. Such a durable superhydrophobic and oleophobic cotton fabric is useful for functional clothing and textile products in various fields.
To develop an effective and convenient solution for underwater repelling oil and cleaning up oily water, TiO 2 nano-coating is deposited on the surface of poly(propylene) nonwoven (PPN) by atomic layer deposition (ALD). There is no evident change in the morphologies comparing ALD-modified PPN with PPN except for thickness. For oils of different densities, such as 1,2-dichloroethane, methylene chloride, chloroform, carbon tetrachloride, n -hexane, and petroleum ether, the underwater oil contact angle and underwater oil sliding angle of ALD-modified PPN range from 152.25° to 156.19° and 5.63° to 8.80°, respectively, exhibiting superior superhydrophilicity and underwater superoleophobicity. Notably, ALD-modified PPN shows a high chemical stability in different solutions, such as acid, alkali, salt, and polar solvent, which even can slightly improve the underwater superoleophobicity of TiO 2 nano-coating. The excellent underwater anti-oil property, self-cleaning property, robust chemical resistance, and easily scaled-up preparation process of TiO 2 -coated PPN suggest great potential for practical applications in the energy, environmental protection, marine anti-fouling, and microflow control fields.
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