Gou Xuelian, Guo Zhiguang
Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, 368 Friendship Avenue, Wuhan 430000, People's Republic of China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 18 Tianshui Middle Road, Lanzhou 730000, People's Republic of China.
Langmuir. 2020 Aug 4;36(30):8983-8992. doi: 10.1021/acs.langmuir.0c01877. Epub 2020 Jul 22.
How to prepare multifunctional surfaces with high nucleation density and fast droplet removal during droplet condensation remains a challenge. It is believed that a water droplet on a superhydrophobic surface (SHS) in the Cassie state is inclined to convert to the Wenzel state under high-pressure or high-humidity conditions, which results in the pinning effect. Hence, it is necessary to form thermodynamically stable lubricant-infused surfaces (LISs) to be applied in water condensation, especially under extreme working conditions. In this work, CuO LISs with two different morphologies (chrysanthemum-like and dandelion-like structures) in the slippery state were prepared and the effect of surface morphology on water harvesting behavior was investigated. The results indicated that dandelion-like CuO consisting of nanoneedles exhibited inferior water harvesting behavior compared to chrysanthemum-like CuO consisting of nanolamellas due to worse lubricating oil loss. Furthermore, the strong intermolecular forces between the perfluoropolyether (PFPE) lubricating oil and perfluorodecanethiol (PFDT)-modified coating resulted in a durable lubricating layer, which exhibited favorable anti-icing, anticorrosion, and liquid repellency even under strong acid and alkali conditions, high shear force rate up to 7000 rpm, and long-time ultraviolet light irradiation for 12 h. This work paves the path for efficient droplet nucleation and removal, which has potential in water harvesting in arid regions and water condensation for power generation.
如何在液滴冷凝过程中制备具有高成核密度和快速液滴去除能力的多功能表面仍然是一个挑战。据信，处于Cassie状态的超疏水表面（SHS）上的水滴在高压或高湿度条件下倾向于转变为Wenzel状态，这会导致钉扎效应。因此，有必要形成热力学稳定的注入润滑剂表面（LISs）以应用于水冷凝，特别是在极端工作条件下。在这项工作中，制备了处于光滑状态的具有两种不同形态（菊花状和蒲公英状结构）的CuO LISs，并研究了表面形态对集水行为的影响。结果表明，由纳米针组成的蒲公英状CuO由于润滑油损失更严重，与由纳米片组成的菊花状CuO相比，其集水行为较差。此外，全氟聚醚（PFPE）润滑油与全氟癸硫醇（PFDT）改性涂层之间的强分子间力导致了一个持久的润滑层，即使在强酸和强碱条件下、高达7000 rpm的高剪切力速率以及长达12小时的长时间紫外线照射下，该润滑层仍表现出良好的防冰、防腐和拒液性能。这项工作为高效的液滴成核和去除铺平了道路，在干旱地区的集水和发电用水冷凝方面具有潜力。
