Wang Zhaolong, Xie Mingzhu, Guo Qing, Liao Yibo, Zhang Ce, Chen Yongping, Dong Zhichao, Duan Huigao
Interdisciplinary Research Center of Low-carbon Technology and Equipment, College of Mechanical and Vehicle Engineering, Hunan University, 1 South Lushan, Changsha 410082, PR China.
MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical and Power Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China.
PNAS Nexus. 2023 May 31;2(6):pgad177. doi: 10.1093/pnasnexus/pgad177. eCollection 2023 Jun.
Freezing phenomenon has troubled people for centuries, and efforts have been made to lower the liquid freezing temperature, raise the surface temperature, or mechanical deicing. Inspired by the elytra of beetle, we demonstrate a novel functional surface for directional penetration of liquid to reduce icing. The bionic functional surface is fabricated by projection microstereolithography (PSL) based three dimensional printing technique with the wettability on its two sides tailored by TiO nanoparticle sizing agent. A water droplet penetrates from the hydrophobic side to the superhydrophilic side of such a bionic functional surface within 20 ms, but it is blocked in the opposite direction. Most significantly, the penetration time of a water droplet through such a bionic functional surface is much shorter than the freezing time on it, even though the temperature is as low as -90°C. This work opens a gate for the development of functional devices for liquid collection, condensation, especially for hyperantifogging/freezing.
结冰现象困扰人们已有数百年之久，人们一直在努力降低液体的凝固温度、提高表面温度或进行机械除冰。受甲虫鞘翅的启发，我们展示了一种用于液体定向渗透以减少结冰的新型功能表面。这种仿生功能表面是通过基于投影微立体光刻（PSL）的三维打印技术制造的，其两侧的润湿性由TiO纳米颗粒施胶剂进行调整。水滴在20毫秒内从这种仿生功能表面的疏水侧渗透到超亲水侧，但在相反方向则受阻。最显著的是，即使温度低至-90°C，水滴穿过这种仿生功能表面的渗透时间也比其在表面上的冻结时间短得多。这项工作为开发用于液体收集、冷凝的功能器件，尤其是超抗雾/抗冻功能器件打开了一扇大门。
