期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 146, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106405
关键词
superhydrophobic surface; spraying coating; robustness; impalement resistance
资金
- National Natural Science Foundation of China [51861165103]
- regional key projects of science and technology service network program of Chinese Academy of Sciences [KFJ-STS-QYZD-121]
- Chinese-Austrian Cooperative Research and Development Projects [GJHZ2043]
Superhydrophobic surfaces (SHSs) were successfully fabricated using a two-step spray-coating technique, with micro-particles as the bottom layer and nanoparticles as the top layer. By optimizing the micro/nano-hierarchical structures, the SHSs exhibited super-repellence to various liquids and excellent mechanical robustness. They also showed high resistance to water impact and hydrostatic pressure, setting a new record in the field.
Superhydrophobic surfaces (SHSs) exhibit outstanding liquid-repellent properties, attracting numerous attentions from both academia and industry. However, their weak mechanical robustness and poor water impact resistance still limit their practical applications. Herein, SHSs were fabricated by a simple and scalable two-step spray-coating technique, i.e., spray-coating micro-particles as bottom layer, followed by spray-coating nanoparticles onto the micro-particles as top layer; both micro- and nano-features were firmly affixed by low-surfaceenergy polymer binder. By carefully tuning the micro-particle ratio in bottom layer and mixed solvent ratio in top layer, we obtained the optimized micro/nano- hierarchical structures, which offered the SHSs super-repellence to various liquids (e.g., water, blood and honey) and excellent mechanical robustness to cloth wipe, eraser rub, multi-cycled sandpaper abrasion and tape peel-off. The SHSs withstood high-speed droplet impact and water jet impact with water impact speed of up to -9.5 m/s (corresponding to -3760 of Weber value). In addition, they maintained the superhydrophobicity under a hydrostatic pressure of 0.1 MPa for more than one month, or 3 MPa for more than 12 h, which is the highest record ever reported.
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