Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
J Colloid Interface Sci. 2019 Oct 15;554:250-259. doi: 10.1016/j.jcis.2019.06.106. Epub 2019 Jul 6.
Superamphiphobic surfaces have attracted extensive attention from both academic and commercial communities because of their unique wettability. However, big challenge still remains as superamphiphobic surfaces frequently suffer the drawbacks of either easy adhesion of liquids with low surface tension (<27.5 mN m) or low transparency, which in turn seriously hinders their applications. Here, we report the exploitation of highly transparent superamphiphobic surfaces, which was prepared by chemical vapor deposition (CVD) of 1H,1H,2H,2H-perfluorodecyltrichlorosilane onto silica nanotubes, via elaborate microstructure regulation. The silica nanotubes are synthesized by coating multiwalled carbon nanotubes (MWCNTs) with a layer of polysiloxane followed by calcination in air. The effects of various parameters, including the concentration of MWCNTs, the solvents for re-dispersing the polysiloxane-modified MWCNTs and its spray-coating density, on superamphiphobicity and transparency were systematically studied. The results show that the superamphiphobicity and transparency are highly dependent on the solvents for re-dispersing polysiloxane-modified MWCNTs because the microstructure of the polysiloxane layer, i.e. the precursor of silica nanotubes, relies on the re-dispersing solvents. The superamphiphobic coatings feature extremely low sliding angles for various liquids with surface tension as low as 21.6 mN m and very high optical transparency, superior to most of the reported superamphiphobic surfaces, which make them promising candidates as functional surfaces or coatings for a broad variety of applications, e.g., in situ observation using microscopes, self-cleaning windows, and so on.
超疏水表面因其独特的润湿性而受到学术界和商业界的广泛关注。然而，超疏水表面经常存在易粘附表面张力低（<27.5 mN m）的液体或低透明度的缺点，这严重阻碍了它们的应用，仍然是一个巨大的挑战。在这里，我们通过化学气相沉积（CVD）将 1H，1H，2H，2H-全氟癸基三氯硅烷沉积到二氧化硅纳米管上，制备了高度透明的超疏水表面，通过精心调控微观结构来实现这一点。通过在多壁碳纳米管（MWCNTs）上涂覆一层聚硅氧烷，然后在空气中煅烧，合成了二氧化硅纳米管。系统研究了各种参数（包括 MWCNTs 的浓度、用于再分散聚硅氧烷改性 MWCNTs 的溶剂及其喷涂密度）对超疏水性和透明度的影响。结果表明，超疏水性和透明度高度依赖于用于再分散聚硅氧烷改性 MWCNTs 的溶剂，因为聚硅氧烷层的微观结构，即二氧化硅纳米管的前体，取决于再分散溶剂。超疏水涂层具有极低的各种表面张力低至 21.6 mN m 的液体的滑动角和非常高的光学透明度，优于大多数报道的超疏水表面，这使它们成为各种应用的功能表面或涂层的有前途的候选者，例如显微镜的原位观察、自清洁窗户等。
