Superamphiphobic surfaces have been arousing great attention in recent years for improved durability in practical applications. In this study, composites of dual‐sized porous silicas of micro‐/nanoparticles and silicic acid binder were coated on the glassy substrate as the micro‐/nano‐structure, then 60 nm porous silica particles modified by 3‐aminopropyltriethoxysilane (APTS) were coated. With the aid of the efficient, rapid, and stoichiometric reaction of amino group and epoxy group, the monolayer low‐surface‐energy long perfluorinated chains self‐assembled in the surface. Field emission scanning electron microscope (FESEM) and atomic force microscopy (AFM) verified the concave–convex surface topological features. This surface realized super‐repellency to liquids (surface tension ranging from 72.0 to 27.2 mN/m). This surface sustains superamphiphobicity after 15 times of the tape tearing test. After soaking in base (pH = 14), acid (pH = 1), and n‐heptane for 20 days, this surface still holds superamphiphobicity. Its heat‐resistant ability is so outstanding that it keeps superamphiphobicity after drying for 3 h at 250°C.

It is difficult to separate oil-polluted water mixtures, which has been considered a global problem. In this study, a simple dip-coating process was used to produce a stainless-steel mesh coated with poly (malaic acid mono-(2-(dimethylamino)-ethyl ester-co-hydroxyethyl acrylate)-tetraethyl orthosilicate-silica (P(MDME-co-HEA)-TEOS-SiO2). The membrane’s shape, chemical composition, separation capabilities, and mechanical properties were carefully examined. The membrane was extremely hydrophilic and extremely oil-phobic underwater due to its rough surface structure and hydrophilic chemical composition. For petroleum ether/water mixture, the separation flux of the membrane reached 224,600 l·m−2·h−1, with a 99.96% separation efficiency. The coated mesh also presented outstanding anti-oil fouling performance. Moreover, it exhibited excellent mechanical resistance and chemical stability.