Icing delay of sessile water droplets on superhydrophobic titanium alloy surfaces
Icing delay of sessile water droplets on superhydrophobic titanium alloy surfaces
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DOI：
10.1016/j.colsurfa.2021.126587
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发表时间：
2021-04-17
影响因子：
5.2
通讯作者：
Hu, Jun
中科院分区：
文献类型：
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作者：
Guo, Chunfang;Zhang, Meiju;Hu, Jun
超疏水表面已被广泛考虑并有望在提升防冰性能方面发挥重要作用。在这项研究中，通过激光加工和进一步化学改性相结合，制备了基于钛合金的超疏水表面。分别通过扫描电子显微镜和接触角测量来表征表面形态和润湿性。在自建装置上的湿度条件下，研究了保持在零下温度下的固着水滴在光滑亲水、光滑疏水和超疏水表面上的结冰行为。分析了表面润湿性、形貌和温度对液滴结冰的影响。结果表明，在整个温度范围内，超疏水钛合金表面上的液滴结冰显着延迟。降低表面温度、延长冷却阶段和冷冻阶段的时间依次决定了总结冰延迟。还观察到，由于液-气界面分数较大，水滴的结冰延迟在有凹坑的超疏水表面上比在有凹槽的表面上更明显。该研究为制备超疏水表面以防止钛合金结冰提供了一种有效的方法。
Superhydrophobic surfaces have been widely considered and expected to play an important role in promoting anti-icing performance. In this research, superhydrophobic surfaces based on titanium alloy were fabricated by combining laser processing and further chemical modification. Surface morphology and wettability were characterized with scanning electron microscopy and contact angle measurement, respectively. Icing behaviors of sessile water droplets on smooth hydrophilic, smooth hydrophobic and superhydrophobic surfaces, maintained at subzero temperatures, were investigated under a humidity condition on a self-built apparatus. The effects of surface wettability, morphology and temperature on droplet icing were analyzed. Results show that droplet icing is remarkably delayed on the superhydrophobic titanium alloy surfaces through the temperature range. Decreasing surface temperature, the extended time for the cooling stage and the freezing stage in sequence dominates the total icing delay. It was also observed that the icing delay of water droplets is more obvious on the pitted superhydrophobic surface than on the grooved one, due to the larger liquid-air interface fraction. This study provides an effective approach for fabricating superhydrophobic surfaces to resist icing on titanium alloy.