Tuning Superhydrophobic Materials with Negative Surface Energy Domains

被引:26
作者
Wu, Zhongzhen [1 ]
Liu, Liangliang [2 ]
Li, Shunning [1 ]
Ji, Shunping [1 ]
Chen, Pinghu [1 ]
Cui, Suihan [1 ]
Ma, Zhengyong [1 ]
Weng, Yuchang [1 ]
Huang, Qian [1 ]
Wu, Zhongcan [1 ]
Wu, Hao [1 ]
Lin, Yuan [1 ]
Fu, Ricky K. Y. [2 ]
Lin, Hai [1 ]
Tian, Xiubo [1 ]
Chu, Paul K. [2 ]
Pan, Feng [1 ]
机构
[1] Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China
[2] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China
基金
国家重点研发计划;
关键词
MICRO-ARC OXIDATION; CORROSION;
D O I
10.34133/2019/1391804
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Hydrophobic/superhydrophobic materials with intrinsic water repellence are highly desirable in engineering fields including anti-icing in aerocrafts, antidrag and anticorrosion in ships, and antifog and self-cleaning in optical lenses, screen, mirrors, and windows. However, superhydrophobic material should have small surface energy (SE) and a micro/nanosurface structure which can reduce solid-liquid contact significantly. The low SE is generally found in organic materials with inferior mechanical properties that is undesirable in engineering. Intriguingly, previous theoretical calculations have predicted a negative SE for theta-alumina (theta-Al2O3), which inspires us to use it as a superhydrophobic material. Here, we report the experimental evidence of the small/negative SE of theta-Al2O3 and a theta-Al2O3 -based superhydrophobic coating prepared by one-step scalable plasma arcing oxidation. The superhydrophobic coating has complete ceramic and desired micro/nanostructure and therefore exhibits excellent aging resistance, wear resistance, corrosion resistance, high-temperature tolerance, and burning resistance. Owing to the rarity of the small/negative SE in inorganic materials, the concept to reduce SE by theta-Al2O3 may foster a blowout to develop robust superhydrophobicity by complete inorganic materials.
引用
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页数:7
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