Ping Zhongxin, Sun Qingyun, Yi Jiuqi, Li Qianqian, Zhao Lukang, Zhang Hui, Huang Fangzhi, Li Shikuo, Cheng Longjiu
Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China.
ACS Appl Mater Interfaces. 2021 Oct 20;13(41):49556-49566. doi: 10.1021/acsami.1c15823. Epub 2021 Oct 12.
Studies which regulate macroscopic wetting states on determined surfaces in multiphase media are of far-reaching significance but are still in the preliminary stage. Herein, inspired by the wettability subassembly of fish scales, Namib desert beetle shell, and lotus leaf upper side, interfaces in the air-water-oil system are programmed by defect engineering to tailor the anti-wetting evolution from double to triple liquid repellency states. By controlling the visible light irradiation and plasma treatment, surface oxygen vacancies on CuO@TiO nanowires (NWs) can be healed or reconstructed. The original membrane or the membrane after plasma treatment possesses abundant surface oxygen vacancies, and the homogeneous hydrophilic membrane shows only double anti-wetting states in the water-oil system. By the unsaturated visible light irradiation time, the surface oxygen vacancy partially healed, the heterogeneous hydrophilic-hydrophobic components occupied the membrane surface, and the anti-wetting state finally changed from double to triple in the air-water-oil system. After the illumination time reaches saturation, it promotes the healing of all surface oxygen vacancies, and the membrane surface only contains uniform hydrophobic components and only maintains double anti-wetting state in the air-oil system. The mechanism of the triple anti-wetting state on a heterogeneous surface is expounded by establishing a wetting model. The wetting state and the adhesion state of the CuO@TiO NW membrane show regional specificity by controlling the illumination time and region. The underwater oil droplets exhibit the "non-adhesive" and "adhesive" state in a region with unsaturated irradiation time or in an unirradiated region, respectively. Underwater oil droplet manipulation can be accomplished easily based on switchable wettability and adhesion. Current studies reveal that defect engineering can be extended to anti-wetting evolution in the air-water-oil system. Constructing an anti-wetting interface by heterogeneous components provides reference for designing the novel anti-wetting interface.
在多相介质中调控特定表面宏观润湿状态的研究具有深远意义，但仍处于初步阶段。在此，受鱼鳞、纳米比亚沙漠甲虫壳和荷叶上表面的润湿性组件启发，通过缺陷工程对空气 - 水 - 油系统中的界面进行编程，以实现从双液驱避状态到三液驱避状态的抗润湿演变。通过控制可见光照射和等离子体处理，CuO@TiO纳米线（NWs）表面的氧空位可以被修复或重构。原始膜或经等离子体处理后的膜具有丰富的表面氧空位，均匀的亲水膜在水 - 油系统中仅表现出双抗润湿状态。通过不饱和可见光照射时间，表面氧空位部分修复，异质亲水 - 疏水组分占据膜表面，在空气 - 水 - 油系统中抗润湿状态最终从双液驱避变为三液驱避。光照时间达到饱和后，促进所有表面氧空位修复，膜表面仅含均匀的疏水组分，在空气 - 油系统中仅维持双抗润湿状态。通过建立润湿模型阐述了异质表面上三抗润湿状态的机理。通过控制光照时间和区域，CuO@TiO NW膜的润湿状态和粘附状态表现出区域特异性。水下油滴在不饱和照射时间区域或未照射区域分别呈现“非粘附”和“粘附”状态。基于可切换的润湿性和粘附性可轻松实现水下油滴操控。当前研究表明，缺陷工程可扩展至空气 - 水 - 油系统中的抗润湿演变。通过异质组分构建抗润湿界面为设计新型抗润湿界面提供了参考。
