A multifunction superhydrophobic surface with excellent mechanical/chemical/physical robustness
A multifunction superhydrophobic surface with excellent mechanical/chemical/physical robustness
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具有优异的机械/化学/物理鲁棒性的多功能超疏水表面
DOI：
10.1016/j.colsurfa.2022.128258
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发表时间：
2022-03
期刊：
影响因子：
--
通讯作者：
Hong Zhen
中科院分区：
文献类型：
--
作者：
Yin Zuozhu;Zhou Dongpeng;Li Min;Chen Xiaoxiang;Xue Mingshan;Ou Junfei;Luo Yidan;Hong Zhen
超疏水表面在润湿领域具有许多优点。然而，缺乏简单的生产方法和有限的机械/化学/物理鲁棒性仍然是超疏水材料的可扩展性，大面积生产和广泛使用的两个最相关的障碍。本文采用热压烧结和喷涂相结合的工艺，制备了一种机械/化学/物理稳定性好的超疏水涂层样品，该样品由规则排列的正方形Cu网和侧壁上的聚四氟乙烯（PTFE）和SiO2粉末的二次纳米结构组成。以Cu网为模板，在涂层表面形成一级粗糙度的凹槽和凸起，SiO2粉末保留在涂层表面，形成两级层次结构，微纳米结构通过低表面能聚合物粘结剂（PTFE）牢固附着。为了比较，还制备了Cu网和Cu网/Cu样品。采用扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）和随时间变化的表观接触角对材料进行了表征。通过腐蚀溶液、高温、紫外线照射、超声波处理、水滴撞击、沙粒撞击、多循环砂纸磨损、胶带剥离试验和自清洁试验来模拟真实世界的损伤。所有装甲超疏水涂层样品的表观水接触角均超过150°，并具有出色的机械和化学弹性。盐雾试验和力学性能测试结果表明，装甲超疏水涂层试样的腐蚀速率最低，拉伸强度最高，延伸率最大，具有最好的耐腐蚀性能和力学性能。这一策略可能会为需要在恶劣工作条件下保持机械/化学/物理坚固性的复合材料的开发提供指导。
Superhydrophobic surfaces have many advantages in wetting fields. However, the lack of easyily production methods and limited mechanical/chemical/physical robustness remain the two most pertinent barriers to the scalability, large-area production, and widespread use of superhydrophobic materials. In this work, a mechanical/chemical/physical robustness superhydrophobic coating sample consisting of a regular array of square Cu mesh with secondary nano structures of polytetrafluoroethylene (PTFE) and SiO2powders on the sidewalls is produced through a scalable and easyily production technique of the combination of hot-press sintering and subsquent spray-coating. The Cu mesh is used as a template to fabricate the grooves and bulges as the first-level roughness, and the SiO2powder is maintained on the surface of the coatings to form two-level hierarchical structures, with both micro and nano structures firmly affixed by low-surface energy polymer binder (PTFE). For comparison, Cu mesh and Cu mesh/Cu sample are also produced. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and time-dependent apparent contact angle are used to examine the as-prepared materials. The corrosive solution, high temperature, UV irradiation, ultrasonic treatment, water drop hitting, sand drop impacting, multi-cycled sandpaper abrasion, tape-peeling test, and self-cleaning test was conducted to simulate the real-world damages. All of the armored superhydrophobic coating samples have an apparent water contact angle of more than 150°, as well as outstanding mechanical and chemical resilience. The salt spray test and mechanical behavior of the as-prepared samples revealed that the armored superhydrophobic coating sample has the lowest corrosion rate, the highest tensile strength, and the greatest elongation among these threee as-prepared samples, implying that it has the best anti-corrosion ability and mechanical property. This strategy might give guidance for the development of composite materials that need to retain mechanical/chemical/physical robustness in severe working conditions.
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