College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Langmuir. 2023 Feb 21;39(7):2548-2557. doi: 10.1021/acs.langmuir.2c02756. Epub 2023 Feb 10.
Superhydrophobic surfaces with low adhesion have attracted great attention in recent years owing to their extensive applications. Enlightened by multifunctional rice leaves, a micro/nanobinary structured superhydrophobic surface was successfully fabricated on the Ti6Al4V substrate by photoetching, acid etching, alkaline etching, as well as fluorination treatments. Water droplets exhibited a Cassie impregnating wetting state on this superhydrophobic surface, under which the contact area fraction of the liquid-air interface caused by primary micron-scale stripped bumps () and secondary nanoflower-like structures () were calculated for the first time. The water adhesion force of this nonwetting surface was precisely measured as 7 μN, which was much lower than that (362 μN) of the original flat substrate and the previous reported surfaces. Moreover, this low-adhesive surface displayed good chemical stability after exposing to air, soaking in aqueous solutions (acid, alkaline, and salt), and cyclic icing/melting treatment. It also showed good mechanical durability after a series of abrasion treatments. Besides, this multifunctional superhydrophobic surface exhibited superior antipollution property to different kinds of contaminants. This multifunctional superhydrophobic surface displays a huge potential for industrial droplet transportation and self-cleaning applications.
近年来，具有低粘附力的超疏水表面因其广泛的应用而受到极大关注。受多功能水稻叶的启发，通过光蚀刻、酸蚀刻、堿蚀刻和氟化处理，在 Ti6Al4V 基底上成功制备了微/纳米二元结构的超疏水表面。在这种超疏水表面上，液滴呈现出 Cassie 浸渍润湿状态，首次计算了由初级微米级剥落凸块（）和次级纳米花状结构（）引起的液体-空气界面的接触面积分数。该非润湿表面的水粘附力被精确测量为 7 μN，远低于原始平坦基底和先前报道的表面的水粘附力（362 μN）。此外，这种低粘附力表面在暴露于空气、浸泡在水溶液（酸、堿和盐）以及循环结冰/融化处理后仍具有良好的化学稳定性。在经过一系列磨损处理后，它还表现出良好的机械耐久性。此外，这种多功能超疏水表面对不同种类的污染物表现出优异的抗污染性能。这种多功能超疏水表面在工业液滴输送和自清洁应用方面具有巨大的潜力。
