Shen Yizhou, Tao Jie, Tao Haijun, Chen Shanlong, Pan Lei, Wang Tao
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing, Jiangsu 210016, People's Republic of China.
Langmuir. 2015 Oct 6;31(39):10799-806. doi: 10.1021/acs.langmuir.5b02946.
On the basis of the icing-delay performance and ice adhesion strength, the anti-icing potential of the superhydrophobic surface has been well-investigated in the past few years. The present work mainly emphasized the investigations of ice nucleation and growth to fully explore the anti-icing potential of the superhydrophobic surface. We took the various surfaces ranging from hydrophilic to superhydrophobic as the research objects and, combining the classical nucleation theory, discussed the ice nucleation behaviors of the water droplets on these sample surfaces under the condition of supercooling. Meanwhile, the macroscopical growth processes of ice on these surfaces were analyzed on the basis of the growth mechanism of the ice nucleus. It was found that the superhydrophobic surface could greatly reduce the solid-liquid interface nucleation rate, owing to the extremely low actual solid-liquid contact area caused by the composite micro-nanoscale hierarchical structures trapping air pockets, leading to the bulk nucleation dominating the entire ice nucleation at the lower temperatures. Furthermore, ice on the superhydrophobic surface possessed a lower macroscopical growth velocity as a result of the less ice nucleation rate and the insulating action of the trapped air pockets.
基于结冰延迟性能和冰粘附强度，超疏水表面的抗冰潜力在过去几年中得到了充分研究。目前的工作主要侧重于对冰核形成和生长的研究，以全面探索超疏水表面的抗冰潜力。我们以从亲水到超疏水的各种表面为研究对象，结合经典成核理论，讨论了过冷条件下水滴在这些样品表面上的冰核形成行为。同时，基于冰核的生长机制分析了这些表面上冰的宏观生长过程。结果发现，由于复合微纳尺度分级结构捕获气穴导致实际固液接触面积极低，超疏水表面可大大降低固液界面成核速率，使得在较低温度下整体成核主导整个冰核形成过程。此外，由于冰核形成速率较低以及捕获气穴的绝缘作用，超疏水表面上的冰具有较低的宏观生长速度。
