Department of Mechanical Engineering , Stevens Institute of Technology , Hoboken , New Jersey 07030 , United States.
Department of Precision Mechanical Engineering , Gangneung-Wonju National University , Wonju-si , Gangwon-do 26403 , Republic of Korea.
Langmuir. 2018 Nov 20;34(46):13821-13827. doi: 10.1021/acs.langmuir.8b02231. Epub 2018 Nov 6.
Superhydrophobic surfaces have gained tremendous attention for icephobic properties, including anti-icing and deicing. The former is about how much a surface can delay the ice formation, whereas the latter is about how easy the surface can let the ice go off after freezing. In this study, superhydrophobic surfaces with different surface roughnesses and wettabilities were tested for both anti-icing and deicing purposes to investigate their correlation in association with the different surface properties. Anti-icing test was conducted by utilizing an icing wind tunnel to see how much ice gets accumulated on the surfaces in a dynamic condition (i.e., impacting supercooled water droplets by forced wind). For the deicing test, sessile droplets were frozen on the surfaces in a static condition (i.e., no wind) and then the shear adhesion forces were measured to disconnect the frozen ices off from the surfaces. The experimental results show that higher anti-icing efficacy does not necessarily mean higher deicing efficacy because of the different icing mechanisms. Although a superhydrophobic surface with a lower depinning force (or contact angle hysteresis) delays the ice accumulation in a dynamic condition more effectively, the same surface can require higher shear adhesion force for ice grown in a static condition where condensation and wetting state of a droplet are the key factors.
超疏水表面因其抗冰性能而备受关注，包括抗结冰和除冰。前者是指表面能在多大程度上延迟冰的形成，而后者是指表面在结冰后能在多大程度上轻易地让冰脱落。在这项研究中，我们测试了具有不同表面粗糙度和润湿性的超疏水表面，以研究它们在不同表面性质下与抗结冰和除冰目的相关的相关性。抗结冰测试是通过使用结冰风洞进行的，以观察在动态条件下（即通过强制风冲击过冷水滴）表面上会积累多少冰。对于除冰测试，在静态条件下（即无风）将静止的液滴冻结在表面上，然后测量剪切粘附力，以将冻结的冰从表面上断开。实验结果表明，较高的抗结冰效果并不一定意味着较高的除冰效果，因为结冰机制不同。尽管具有较低脱附力（或接触角滞后）的超疏水表面在动态条件下更有效地延迟冰的积累，但对于在静态条件下生长的冰，相同的表面可能需要更高的剪切粘附力，因为在这种条件下，液滴的凝结和润湿状态是关键因素。
