Wang Tao, Zheng Meifen, Wang Lina, Ji Lvlv, Wang Sheng
Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China.
Nanotechnology. 2020 Aug 28;31(35):355504. doi: 10.1088/1361-6528/ab92c6. Epub 2020 May 13.
A bubble-propelled autonomous micro/nanomotor (MNM) is a device driven by a catalytic reaction that involves a solid-liquid-gas interface, which in turn is a key factor in achieving effective propulsion. Generally, modifying the liquid phase by adding surfactants can improve propulsion, but it has several disadvantages. It is reported that the rapid separation of bubbles will accelerate the movement of MNMs. Our focus is on methods to drive the motor efficiently by controlling the wettability of the solid phase, accelerating bubble separation without compromising the activity of the catalyst. In this study, different from most of the previous studies on moving MNMs, a static Pt loaded TiO nanowire aggregation was utilized as a nanomotor aggregation to investigate the wettability of the solid phase on bubble release. In comparison to an underwater aerophilic solid phase, in which bubbles are strongly held on the surface, the nanomotor's aggregation showed good aerophobicity. In particular, after UV illumination for 30 s, the nanomotor's aggregation became superaerophobic, which significantly promoted the release of O bubbles. The results of this study reveal how to modify the detachment behaviour of bubbles by controlling the aerophobic behaviour of solid surfaces of autonomous MNMs in an aqueous medium.
气泡驱动的自主式微纳马达（MNM）是一种由涉及固-液-气界面的催化反应驱动的装置，而这反过来又是实现有效推进的关键因素。一般来说，通过添加表面活性剂来改变液相可以改善推进效果，但它有几个缺点。据报道，气泡的快速分离会加速MNM的运动。我们的重点是通过控制固相的润湿性来有效驱动马达的方法，在不影响催化剂活性的情况下加速气泡分离。在本研究中，与之前大多数关于移动MNM的研究不同，使用静态负载Pt的TiO纳米线聚集体作为纳米马达聚集体，以研究固相润湿性对气泡释放的影响。与水下亲气固相相比，在水下亲气固相中气泡强烈附着在表面，而纳米马达聚集体表现出良好的疏气性。特别是，在紫外光照射30秒后，纳米马达聚集体变得超疏气，这显著促进了O气泡的释放。本研究结果揭示了如何通过控制自主MNM在水介质中固相的疏气行为来改变气泡的脱离行为。
