Self-cleaning and corrosion-resistant superamphiphobic coating with super-repellency towards low-surface-tension liquids

Abstract

In this paper, we designed and fabricated a liquid-repellent coating that features both superhydrophobicity and superoleophobicity, viz. Superamphiphobic properties, based on dual adhesive tape binding layer and 1H,1H,2H,2H-perfluorodecyltriethoxysilane modified aluminum oxide nanoparticles (Al2O3@PDFTES NPs). The constructed superamphiphobic coating presented non-wetting, high contact angles (CA), and low sliding angles (SA) towards various liquids with different surface tensions including water (CA = 167.6 ± 3.5°, SA = 2.9 ± 0.6°), glycerol (CA = 154.2 ± 2.7°, SA = 4.7 ± 0.4°), ethylene glycol (CA = 156.1 ± 2.4°, SA = 5.8 ± 0.2°), and peanut oil (CA = 155.2 ± 2.8°, SA = 6.5 ± 0.7°). The dynamic self-cleaning behaviors driven by water-, oil-, and hot water droplets verified the super-repellency, ultra-low surface energy, and interfacial adhesion force. The electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements showed >250 mV positive shifting of Ecorr, 4 orders of magnitude lower Icorr, 7 orders of magnitude higher Rct and |Z| modulus values, demonstrating a significantly improved corrosion resistance of the superamphiphobic coating. The synergistic effect of the Al2O3@PDFTES NPs with low surface energy and the adhesive tape layer with interfacial binding force contribute to the development of stably self-cleaning and anti-corrosion superamphiphobic coating, which will be a potential candidate for protective interfacial materials for marine and industrial applications.