Nanotextured Aluminum-Based Surfaces with Icephobic Properties
Nanotextured Aluminum-Based Surfaces with Icephobic Properties
复制标题
DOI：
10.1080/01457632.2019.1640461
复制
发表时间：
2020-11
影响因子：
2.3
通讯作者：
Michael Grizen;T. Maitra;J. Bradley;M. Tiwari
中科院分区：
文献类型：
--
作者：
Michael Grizen;T. Maitra;J. Bradley;M. Tiwari
在寒冷的环境中，经常会发生不希望发生的水冻结（结冰），并可能造成致命的后果。防止结冰通常需要安装主动热系统，这会消耗能源并增加成本。纳米工程超疏水表面可以被动延缓冻结；然而，当暴露在零度以下的温度下时，它们会被霜覆盖，这促进了冰的形成，损害了它们的疏冰性。此外，表面的高导热系数可以降低结霜率。因此，我们选择铝作为我们的工作材料，因为它具有良好的导热性和广泛的工业用途。我们采用电化学阳极氧化工艺来控制和调整表面形貌。至关重要的是，我们证明了纳米级形貌控制的可行性，以及表面固体分数在0.1-0.25范围内的可调性，同时与现有的实践相比，我们使用了更安全的抛光电解质和腐蚀剂，也就是说，我们的方法更环保。通过表面功能化和形貌控制使表面具有低接触角迟滞的（超）疏水性。性能最好的表面显示出低至-19°C的冰核温度，并抵抗液体的渗透——通过高达3米/秒的跌落冲击速度进行测试（韦伯数bbb300）——表明了它们作为疏冰表面的明显潜力。
Abstract Undesirable water freezing (icing) usually occurs in cold environments and may have lethal consequences. Preventing icing usually requires the installation of active thermal systems which consume energy and increase costs. Nanoengineered superhydrophobic surfaces can delay freezing passively; however, when exposed to sub-zero temperatures, they can get covered by frost, which promotes ice formation and impairs their icephobicity. In addition, high thermal conductivity of the surfaces can reduce the frost formation rate. Thus, we chose aluminum as our working material for its good thermal conductivity and widespread industrial usage. We employed electrochemical anodization process to control and tune the surface morphology. Crucially, we demonstrate the feasibility of morphology control at the nanoscale and tunability of the surface solid fraction in the range of 0.1–0.25, while using safer polishing electrolytes and etchants compared to existing practice, i.e., our approach is environmentally friendlier. Surface functionalization and morphology control were used to render the surfaces (super) hydrophobic, with low contact angle hysteresis. The best performing surfaces demonstrate ice nucleation temperatures as low as –19 °C and resist liquid impalement—tested via drop impact velocity up to 3 m/s (Weber number > 300)—demonstrating a clear potential for their exploitation as icephobic surfaces.