Rewritable superhydrophobic coatings fabricated using water-soluble polyvinyl alcohol

Versatile nonfluorinated superhydrophobic coating with self-cleaning, anti-fouling, anti-corrosion and mechanical stability

We report a facile approach to fabricate superhydrophobic (SHP) coating of nickel (Ni)–reduced graphene oxide (rGO)-myristic acid on carbon steel (CS) surface with superior corrosion resistance and self-cleaning ability, using electro-codeposition. The electro-deposition current density and electrolyte bath temperature are optimized to obtain the desired hierarchical surface textures with very high water contact angle (WCA). The microstructure, chemical compositions, surface roughness, and self-cleaning properties were examined using FESEM, XRD, XPS, EDX, AFM, water bouncing etc. A WCA of 174 ± 1.5°, with a sliding angle (SA) of ~1°, was obtained at 60 mA·cm−2 and 45 °C. The FESEM surface morphology showed a hierarchical pinecone structured Ni–rGO composite film. The good adhesion and mechanical stability of SHP coating is achieved by phosphating the surface prior to deposition. The SHP surface showed a two order reduction in the corrosion current density and ~3 orders higher impedance, as compared to uncoated surface. This study demonstrates a new approach for fabricating mechanically and chemically durable SHP coating on CS specimens.

Robust nickel-reduced graphene oxide-myristic acid superhydrophobic coating on carbon steel using electrochemical codeposition and its corrosion resistance

Nonmetal doping is a convenient method to adjust the visible light photocatalytic activity of graphitic carbon nitride (g-C3N4). Herein, highly active sulfur-doped porous g-C3N4 (C3N4-S) was successfully prepared by one-step calcination using thiourea and melamine as the precursors. C3N4-S exhibited excellent photocatalytic performance for the degradation of Rhodamine B (RhB) under visible light irradiation. C3N4-S not only promoted the separation of photogenerated electron-hole pairs, but also enhanced electron transfer, resulting in a great improvement in the photocatalytic efficiency. Based on capture experiments and DMPO spin-trapping ESR spectra, the superoxide radical (˙O2-) was proved to be the predominant active species and the possible photocatalytic mechanism of C3N4-S was proposed. The photocatalytic mechanism of RhB degradation over C3N4-S was further explored using high-resolution mass spectra (HRMS).

One-step preparation of sulfur-doped porous g-C3N4 for enhanced visible light photocatalytic performance

Nature-inspired interfacial materials with special wettability have received considerable attention owing to their superior properties and promising multifunctional applications. Owing to the unique interfacial phase contacts and liquid–repellent property, the interfacial materials with special wettability provide a great potential for corrosion inhibition and biofouling suppression. Thus, this brief review and perspective study provides an overview about the characteristics, fabrication and recent advances of three types of interfacial materials with special wettability, namely superhydrophobic, superamphiphobic and slippery liquid-infused porous surface (SLIPS) toward anti-corrosion and anti-biofouling applications. The bottlenecks and future research priorities of the functional interfacial materials with special wettability were pointed out to accelerate the comprehensive understanding and the development of this research field.

Superhydrophobic, superamphiphobic and SLIPS materials as anti-corrosion and anti-biofouling barriers

Hydrothermally structured superhydrophobic surface with superior anti-corrosion, anti-bacterial and anti-icing behaviors

Bioinspired one step hydrothermal fabricated superhydrophobic aluminum alloy with favorable corrosion resistance

Superamphiphobic aluminum alloy with low sliding angles and acid-alkali liquids repellency

With the discharge of large amount of organic pollutants and antibiotics into the water environment, the water cycle has been seriously polluted, and at the same time, various drug-resistant bacteria have emerged in succession, which poses a serious threat to human health. In recent years, photocatalytic nanomaterials have become a research hotspot in the antimicrobial area. In this study, AgBr/AgVO3 photocatalysts were prepared by a hydrothermal process and an in situ growth method. The composites were tightly connected by the (501) plane of AgVO3 and the (200) lattice plane of AgBr. The photocatalytic activity was tested by degrading Rhodamine B (RhB) solution under visible-light, and the result indicated that the photodegradation rate for RhB solution was 92.3% by the photocatalysis with 0.5AgBr/AgVO3 and the photocatalytic performance of 0.5AgBr/AgVO3 was improved compared to pure AgVO3 and AgBr. In addition, more than 99.997% of E. coli, S. aureus, and P. aeruginosa cells were killed by the photocatalysis with 0.5AgBr/AgVO3 within 30 min. These results demonstrated that the 0.5AgBr/AgVO3 heterojunction photocatalyst could be widely used in the treatment of environmental pollution and in the antibacterial field.

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The effective photocatalysis and antibacterial properties of AgBr/AgVO3 composites under visible-light

Marine corrosion and biofouling seriously affect the service life of marine structural materials, resulting in performance failure, enormous economic loss, and even catastrophic safety accidents. It is worthwhile and desirable to develop high-efficiency strategy for anti-corrosion and anti-biofouling. In this paper, superhydrophobic 5083 aluminum alloy (AA5083) surface with micro-nano hierarchical morphology was fabricated through anodization followed by 1H,1H,2H,2H-perfluorooctyltriethoxysilane (POTS) modification. The surface morphologies, roughness, and chemical compositions were revealed by scanning electron microscopy, atomic force microscopy, and X-ray diffraction. The self-cleaning ability, corrosion resistance and algae adhesion suppression ability of the fabricated surfaces were investigated, indicating an excellent water-proofing, anti-corrosion and anti-biofouling performance. We believe the superhydrophobic creation of metallic materials is expected to have potential applications in marine corrosion and anti-biofouling fields.

Jia Wang

Papers

Hydrothermally structured superhydrophobic surface with superior anti-corrosion, anti-bacterial and anti-icing behaviors

Bioinspired one step hydrothermal fabricated superhydrophobic aluminum alloy with favorable corrosion resistance

Superamphiphobic aluminum alloy with low sliding angles and acid-alkali liquids repellency

The effective photocatalysis and antibacterial properties of AgBr/AgVO3 composites under visible-light

Fabrication of anodized superhydrophobic 5083 aluminum alloy surface for marine anti-corrosion and anti-biofouling