Simultaneous realization of superhydrophobicity and multiple droplet bouncing through laser ablation, organic adsorption and fluorination treatment
Simultaneous realization of superhydrophobicity and multiple droplet bouncing through laser ablation, organic adsorption and fluorination treatment
复制标题
通过激光烧蚀、有机吸附和氟化处理同时实现超疏水性和多次液滴弹跳
DOI：
10.1016/j.mtphys.2022.100739
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发表时间：
2022-06-10
影响因子：
11.5
通讯作者：
Ren, Luquan
中科院分区：
文献类型：
--
作者：
Ma, Zhichao;Zhao, Shengteng;Ren, Luquan
在金属表面实现主动防冰和有效的热管理仍然是一个极端的挑战。然而，超疏水性和多液滴弹跳能力增加了除冰的可能性。特别是在飞机机翼等动态表面时，多液滴的弹跳可以增加液滴在平行于表面的力作用下被动离开固体表面的概率。同时，液滴的形成能力可以通过滴状冷凝而不是膜状冷凝方式提高冷凝散热效率。当施加表面来吸收撞击液滴的动能时，基于收集频率，更多的弹跳次数也可以提高能量收集效率。为了模拟卡西-巴克斯特状态的“荷花效应”，在钛合金表面通过序贯激光烧蚀、有机吸附和氟化处理，制备了具有独特的四元“微柱-微突-纳米颗粒-氟化层”跨尺度结构的超疏水表面。在50 μ m的激光扫描空间上，虽然四元结构呈现交联形态和不规则的微柱阵列，但经过4 h高温有机吸附和0.5 h氟化处理后，液滴的接触角为164.2度，滑动角为7.8度，液滴的弹跳次数为5次。C-C/C-H层与氟化层之间的间隙引起的机械弹簧效应促进了多次弹跳。
Realizing proactive anti-icing and efficient thermal management on metal surfaces is still an extreme challenge. However, superhydrophobicity and multiple droplet bouncing capability can increase the probability of deicing. Especially, when the surface is dynamic such as the wings of an aircraft, the multiple droplet bouncing can increase the probability of the droplet passively leaving the solid surface by the forces parallel to the surface. Meanwhile, the droplet forming ability can increase the efficiency of condensation heat dissipation through dropwise condensation rather than film mode. When the surface is applied to absorb the kinetic energy of the impacting droplet, more bounce times can also increase energy collection efficiency based on the collection frequency. To imitate the "lotus effect" with a Cassie-Baxter state, the superhydrophobic surface with a unique quaternary "micro column-micro protrusions-nano particle-fluorinated layer" cross-scale structure is fabricated on Ti alloy through sequential laser ablation, organic adsorption and fluorination treatment. Based on a laser scanning space of 50 mu m, although the quaternary structures exhibited crosslinked morphology and irregular micro-column array, subsequent 4 h high-temperature organic adsorption and 0.5 h fluorination treatment realize a contact angle of 164.2 degrees, a slide angle of 7.8 degrees and 5 times droplet bounces. The proposed mechanical spring effect induced by the gap between the C-C/C-H layer and the fluorinated layer promotes the multiple bouncing.