Nguyen Huynh H, Tieu A Kiet, Tran Bach H, Wan Shanhong, Zhu Hongtao, Pham Sang T
Faculty of Engineering and Information Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.
Faculty of Engineering and Information Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.
J Colloid Interface Sci. 2021 May;589:242-251. doi: 10.1016/j.jcis.2020.12.101. Epub 2020 Dec 31.
Because they have self-similar low-surface-energy microstructures throughout the whole material block, fabricating superhydrophobic monoliths has been currently a promising remedy for the mechanical robustness of non-wetting properties. Noticeably, porous materials have microstructured interfaces throughout the complete volume, and silanization can make surfaces low-surface-energy. Therefore, the porous structure and surface silane-treatment can be combined to render hydrophilic inorganics into mechanically durable superhydrophobic monoliths.
Superhydrophobic diatomaceous earth pellets were produced by thermal-sintering, followed by a silanization process with octyltriethoxysilane. The durability of superhydrophobicity was evaluated by changes in wetting properties, surface morphology, and chemistry after a systematic abrasion sliding test.
The intrinsic porosity of diatomite facilitated surface silanization throughout the whole sintered pellet, thus producing the water-repelling monolith. The abrasion sliding converted multimodal porosity of the volume to hierarchical roughness of the surface comprised of silanized particles, thereby attaining superhydrophobic properties of high contact angles over 150° and sliding angles below 20°. The tribological properties revealed useful information about the superhydrophobicity duration of the non-wetting monolith against friction. The result enables the application of porous structures in the fabrication of the anti-abrasion superhydrophobic materials even though they are originally hydrophilic.
由于在整个材料块中具有自相似的低表面能微结构，目前制造超疏水整体材料是一种增强非润湿性机械稳定性的有效方法。值得注意的是，多孔材料在整个体积内都具有微结构化界面，而硅烷化可以使表面具有低表面能。因此，将多孔结构与表面硅烷处理相结合，可以使亲水性无机物转变为机械耐用的超疏水整体材料。
通过热烧结制备超疏水硅藻土颗粒，然后用辛基三乙氧基硅烷进行硅烷化处理。通过系统的磨损滑动试验后润湿性、表面形态和化学性质的变化，评估超疏水性的耐久性。
硅藻土的固有孔隙率有助于在整个烧结颗粒中进行表面硅烷化，从而产生拒水整体材料。磨损滑动将材料块的多峰孔隙率转变为由硅烷化颗粒组成的表面分级粗糙度，从而获得接触角超过150°且滑动角低于20°的超疏水性能。摩擦学特性揭示了有关非润湿性整体材料超疏水性持续时间的有用信息。该结果使得多孔结构能够应用于制造抗磨损超疏水材料，即使它们原本是亲水的。
