Sablowski Jakob, Linnemann Julia, Hempel Simone, Hoffmann Volker, Unz Simon, Beckmann Michael, Giebeler Lars
Chair of Energy Process Engineering, Institute of Process Engineering and Environmental Technology, Technische Universität Dresden, 01062, Dresden, Germany.
Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V., Institute for Complex Materials, Helmholtzstraße 20, 01069, Dresden, Germany.
Sci Rep. 2018 Oct 18;8(1):15400. doi: 10.1038/s41598-018-33542-4.
Superhierarchically rough films are rapidly synthesised on metal substrates via electrochemically triggered self-assembly of meso/macroporous-structured metal-organic framework (MOF) crystals. These coatings are applied to immobilise a functional oil with low surface energy to provide stable coatings repellent to a wide range of hydrophobic as well as hydrophilic fluids. Such omniphobic surfaces are highly interesting for several applications such as anti-fouling, anti-icing, and dropwise condensation, and become easily scalable with the presented bottom-up fabrication approach. As investigated by environmental scanning electron microscopy (ESEM), the presented perfluorinated oil-infused Cu-BTC coating constitutes of a flat liquid-covered surface with protruding edges of octahedral superstructured MOF crystals. Water and non-polar diiodomethane droplets form considerably high contact angles and even low-surface-tension fluids, e.g. acetone, form droplets on the infused coating. The repellent properties towards the test fluids do not change upon extended water spraying in contrast to oil-infused porous copper oxide or native copper surfaces. It is discussed in detail, how the presented electrodeposited MOF films grow and provide a proficient surface morphology to stabilise the functional oil film due to hemiwicking.
通过电化学触发介观/大孔结构金属有机框架（MOF）晶体的自组装，在金属基底上快速合成了超层级粗糙薄膜。这些涂层用于固定具有低表面能的功能油，以提供对多种疏水和亲水流体都具有排斥性的稳定涂层。这种全憎表面在诸如防污、防冰和滴状冷凝等多种应用中极具吸引力，并且通过所提出的自下而上的制造方法很容易实现规模化生产。通过环境扫描电子显微镜（ESEM）研究发现，所呈现的全氟油注入的Cu-BTC涂层由一个平坦的液体覆盖表面和八面体超结构MOF晶体的突出边缘组成。水和非极性二碘甲烷液滴形成了相当大的接触角，甚至低表面张力的流体，如丙酮，也在注入油的涂层上形成液滴。与注入油的多孔氧化铜或天然铜表面相比，在长时间喷水后，对测试流体的排斥性能不会改变。详细讨论了所呈现的电沉积MOF薄膜如何生长，并由于半芯吸作用提供一种有效的表面形态来稳定功能油膜。
