Janowicz Norbert J, Li Hangtong, Heale Frances L, Parkin Ivan P, Papakonstantinou Ioannis, Tiwari Manish K, Carmalt Claire J
Nanoengineered Systems Laboratory, Mechanical Engineering, University College London, London WC1E 7JE, United Kingdom.
Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom.
Langmuir. 2020 Nov 17;36(45):13426-13438. doi: 10.1021/acs.langmuir.0c01767. Epub 2020 Nov 4.
In recent decades, there has been a growing interest in the development of functional, fluorine-free superhydrophobic surfaces with improved adhesion for better applicability into real-world problems. Here, we compare two different methods, spin coating and aerosol-assisted chemical vapor deposition (AACVD), for the synthesis of transparent fluorine-free superhydrophobic coatings. The material was made from a nanocomposite of (3-aminopropyl)triethoxysilane (APTES) functional mesoporous silica nanoparticles and titanium cross-linked polydimethylsiloxane with particle concentrations between 9 to 50 wt %. The silane that was used to lower the surface energy consisted of a long hydrocarbon chain without fluorine groups to reduce the environmental impact of the composite coating. Both spin coating and AACVD resulted in the formation of superhydrophobic surfaces with advancing contact angles up to 168°, a hysteresis of 3°, and a transparency of 90% at 550 nm. AACVD has proven to produce more uniform coatings with concentrations as low as 9 wt %, reaching superhydrophobicity. The metal oxide cross-linking improves the adhesion of the coating to the glass. Overall, AACVD was the more optimal method to prepare superhydrophobic coatings compared to spin coating due to higher contact angles, adhesion, and scalability of the fabrication process.
近几十年来，人们对开发功能性、无氟超疏水表面的兴趣日益浓厚，这种表面具有更好的附着力，以便更好地应用于实际问题。在此，我们比较了两种不同的方法，旋涂法和气溶胶辅助化学气相沉积（AACVD），用于合成透明无氟超疏水涂层。该材料由（3-氨丙基）三乙氧基硅烷（APTES）功能化介孔二氧化硅纳米颗粒与钛交联聚二甲基硅氧烷的纳米复合材料制成，颗粒浓度在9至50 wt%之间。用于降低表面能的硅烷由不含氟基团的长烃链组成，以减少复合涂层对环境的影响。旋涂法和AACVD都能形成超疏水表面，前进接触角高达168°，滞后角为3°，在550 nm处透明度为90%。事实证明，AACVD能以低至9 wt%的浓度制备出更均匀的涂层，达到超疏水性。金属氧化物交联提高了涂层与玻璃的附着力。总体而言，与旋涂法相比，AACVD是制备超疏水涂层的更优方法，因为其具有更高的接触角、附着力以及制备过程的可扩展性。
