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    Heat-resistant superamphiphobic robust surface by self-assembled monolayer surface reaction

    Year: 2021

    Journal: Surf. Interface Anal., Volume 53, MAY, page 517–527

    Authors: Liu, Taolin; Kong, Fanxin; Mao, Wentao; Kong, Qinggang; Kong, Fanzhen; Qian, Haiyan

    Keywords: heat‐ resistant; robust surface; self‐ assembled monolayer; superamphiphobic property

    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 degrees C.
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