Anti-icing Materials International Laboratory (AMIL), Université du Québec à Chicoutimi, 555 Boulevard de l'Université, Chicoutimi, Québec, Canada, G7H 2B1.
ACS Appl Mater Interfaces. 2011 Sep;3(9):3583-8. doi: 10.1021/am2007917. Epub 2011 Sep 8.
Monodispersive silica nanoparticles have been synthesized via the Stöber process and further functionalized by adding fluorinated groups using fluoroalkylsilane in an ethanolic solution. In this process, six different sizes of fluorinated silica nanoparticles of varying diameter from 40 to 300 nm are prepared and used to deposit thin films on aluminum alloy surfaces using spin coating processes. The functionalization of silica nanoparticles by fluorinated group has been confirmed by the presence C-F bonds along with Si-O-Si bonds in the thin films as analyzed by Fourier transform infrared spectroscopy (FTIR). The surface roughnesses as well as the water contact angles of the fluorinated silica nanoparticle containing thin films are found to be increased with the increase of the diameter of the synthesized fluorinated silica nanoparticles. The thin films prepared using the fluorinated silica nanoparticles having a critical size of 119 ± 12 nm provide a surface roughness of ∼0.697 μm rendering the surfaces superhydrophobic with a water contact angle of 151 ± 4°. The roughness as well as the water contact angle increases on the superhydrophobic thin films with further increase in the size of the fluorinated silica nanoparticles in the films.
单分散二氧化硅纳米粒子通过 Stöber 法合成，并通过在乙醇溶液中使用氟烷基硅烷进一步官能化，添加氟基团。在这个过程中，制备了六种不同直径（40-300nm）的氟化硅纳米粒子，通过旋涂工艺在铝合金表面沉积薄膜。通过傅里叶变换红外光谱（FTIR）分析，薄膜中存在 C-F 键和 Si-O-Si 键，证明了氟化物的官能化。随着合成的氟化硅纳米粒子直径的增加，含氟硅纳米粒子的薄膜的表面粗糙度和水接触角都有所增加。使用具有临界尺寸为 119±12nm 的氟化硅纳米粒子制备的薄膜，其表面粗糙度约为 0.697μm，使表面具有超疏水性，水接触角为 151±4°。随着薄膜中氟化硅纳米粒子尺寸的进一步增加，超疏水性薄膜的粗糙度和水接触角也会增加。
