期刊
NANO LETTERS
卷 21, 期 10, 页码 4209-4216出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00038
关键词
Passive cooling; Robust; Femtosecond laser; Hierarchical porous; Self-cleaning
类别
资金
- National Natural Science Foundation of China [52075557, 51805553]
- Natural Science Foundation of Hunan Province [2018JJ3666]
- Project of State Key Laboratory of High Performance Complex Manufacturing, Central South University [ZZYJKT2019-12]
This study presents the fabrication of a robust hierarchical porous polytetrafluoroethylene (PTFE) film with self-cleaning function using femtosecond laser ablation technique. The surface structure exhibits outstanding durability of passive cooling effect, resulting in temperature decrease of up to 4 and 10 degrees C compared to other surfaces. This research demonstrates the feasibility of femtosecond laser micromachining in producing durable self-cleaning passive cooling materials.
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.
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