J. Mater. Sci. Technol. ›› 2021, Vol. 66: 74-81.DOI: 10.1016/j.jmst.2020.06.035

• Research Article • Previous Articles     Next Articles

Scalable, fluorine free and hot water repelling superhydrophobic and superoleophobic coating based on functionalized Al2O3 nanoparticles

Binbin Zhanga,b,c,*(), Weichen Xua,b,c, Qingjun Zhua,b,c, Baorong Houa,b,c   

  1. aCAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
    bOpen Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
    cCenter for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
  • Received:2020-06-11 Revised:2020-06-23 Accepted:2020-06-24 Published:2021-03-10 Online:2021-04-01
  • Contact: Binbin Zhang
  • About author:* CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. E-mail address: zhangbinbin11@mails.ucas.ac.cn (B. Zhang).

Abstract:

Hot water droplet and oils induced air cushion failure, intensively used fluorine-containing chemicals, tedious preparation process, etc. are the main bottlenecks of the current artificially fabricated superhydrophobic materials, restricting their large-scale production and real-world applications. Herein, a facile, scalable, fluorine-free spray-coating strategy was employed to achieve superhydrophobic and superoleophobic polymerized organosilanes/Al2O3 nanoparticles (POS/Al2O3 NPs) coatings. The POS/Al2O3 NPs coating was achieved through hydrolytic condensation of tetraethyl orthoilicate (TEOS) and hexadecyltrimethoxysilane (HDTMS) in the presence of Al2O3 NPs. A variety of analytical techniques including scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray photoelectron spectroscopy (EDS) were used to investigate the fabricated coatings. The POS/Al2O3 NPs coating features high contact angle (>158°) and low sliding angle (<5°) for water, glycerol, and ethylene glycol droplets with different surface tensions, verifying both superhydrophobic and superoleophobic properties. Moreover, the coatings present extremely low surface adhesion force, excellent liquid-driven self-cleaning ability, and hot water repellency. The superamphiphobic POS/Al2O3 NPs coating exhibits promising applications in various fields including self-cleaning, corrosion resistance, and preventing scald as this strategy is applicable on various substrates.

Key words: Al2O3, Self-cleaning, Surface coating, Thermal stability, Supehydrophobicity, Wettability