Robust Hierarchical Porous PTFE Film Fabricated via Femtosecond Laser for Self-Cleaning Passive Cooling

被引：104
作者：
Wu, Junrui [1 ]
He, Jun [1 ]
Yin, Kai [1 ,2 ]
Zhu, Zhuo [1 ]
Xiao, Si [1 ]
Wu, Zhipeng [1 ]
Duan, Ji-An [2 ]
机构：
[1] Cent South Univ, Sch Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, Changsha 410083, Peoples R China
[2] Cent South Univ, Coll Mech & Elect Engn, State Key Lab High Performance & Complex Mfg, Changsha 410083, Peoples R China
来源：
NANO LETTERS | 2021年 / 21卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Passive cooling; Robust; Femtosecond laser; Hierarchical porous; Self-cleaning; PERSONAL THERMAL MANAGEMENT; SURFACE; WATER;
D O I：
10.1021/acs.nanolett.1c00038
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Passive cooling materials that spontaneously cool an object are promising choices for mitigating the global energy crisis. However, these cooling effects are usually weakened or lost when dust contaminates the surface structure, greatly restricting their applications. In this work, a robust hierarchical porous polytetrafluoroethylene (PTFE) film with coral-like micro/nanostructures is generated by a facile and efficient femtosecond laser ablation technique. Owing to its unique micro/nanostructures, the as-prepared surface exhibits an outstanding self-cleaning function for various liquids with ultralow adhesion. This self-cleaning characteristic enhances the durability of its passive cooling effect. It is demonstrated that the titanium (Ti) sheet covered with laser-ablated PTFE film can realize a maximum temperature decrease of 4 and 10 degrees C compared to the Ti sheet covered with pristine PTFE film and uncovered, respectively. This study reveals that femtosecond laser micromachining is a facile and feasible avenue to produce robust self-cleaning passive cooling devices.
引用
收藏
页码：4209 / 4216
页数：8
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