Search

• Effective and low-consumption finishing strategy for multifunctional stainless steel mesh and sponges. • Superhydrophobic coating with micro/nano structures is rationally constructed without organic solvents. • Rational water-based aza-Michael addition reaction coating strategy realizes on-demand special wettability. Superhydrophobic porous materials are widely used in oil-water separation due to their water-blocking and oil-passing properties. However, the preparation of most superhydrophobic porous materials is generally energy-intensive and must be performed using organic solvents. In this study, we describe a straightforward and cost-effective strategy for fabricating superhydrophobic coatings on nanosized soil particle-modified stainless steel mesh (SSM). The coating is prepared via the aza-Michael reaction of stearyl acrylate and melamine-urea–formaldehyde (MUF) resin catalysed by methyl cyclodextrin in water. Superhydrophobic meshes with water contact angles (WCAs) exceeding 150° are obtained, exhibiting extraordinary water repellency. The superhydrophobic mesh also effectively prevents surface contamination, creating a self-cleaning surface that is both waterproof and dustproof. Most importantly, the superhydrophobic mesh presents excellent oil separation performance for oil-water mixtures of various compositions, maintaining extremely high separation efficiency (>98%) even after 80 cycles. Additionally, we successfully apply this strategy to the preparation of superhydrophobic melamine sponges with excellent oil adsorption capacity (17.6–44.2 g/g). This innovative study provides an effective strategy for designing biomimetic superhydrophobic surfaces and is a promising development in the field of environmentally friendly oil-water separators. [ABSTRACT FROM AUTHOR]

A superhydrophobic coating composed of epoxy on the bottom and siloxane-modified silica on the top was prepared by employing the scraping and spraying methods. The superhydrophobic coating possesses excellent mechanical properties, is superhydrophobic (water contact angle, WCA = 164.3°), and has low adhesion. The long-term corrosion resistance of the epoxy coating and the superhydrophobic coating in a 3.5 % NaCl solution and hydrogen sulfide environment was assessed using electrochemical impedance spectroscopy (EIS), polarization curve analysis, immersion testing, and X-ray diffraction (XRD). Test results indicate that the superhydrophobic coating has excellent anti-corrosion capability in an H 2 S environment for 50 days and in a 3.5 % NaCl solution for 60 days. This is of great significance for developing the potential applications of superhydrophobic coatings in H 2 S environments. [Display omitted] • Epoxy resin and superhydrophobic surface combination for carbon steel substrate protection. • The coating showed anticorrosive effect in 3.5 % sodium chloride solution. • Superhydrophobic surface has excellent corrosion resistance in H 2 S environment of alternating temperatures and humidities. [ABSTRACT FROM AUTHOR]

Cellulose nanofibrils (CNF) films are generally regarded as promising alternatives for non-biodegradable plastics films. However, the shortcomings of high hydrophilic performance, low elongation and poor folding endurance continue to pose challenges in commercial application. In the present study, we established controllable reflectance CNF films by applying a facile and scalable poly (butylene adipate-co-terephthalate) (PBAT)/SiO 2 nanoparticles (NPs) reinforced strategy in a free chemical modification manner. CNF/PBAT films have the favorable combination of hydrophobicity, elongation and folding endurance. The results reveal a significant improvement in the hydrophobic properties of CNF/PBAT films (water contact angle >80°), as well as a 3 times improvement in folding resistance (1210 cycles), a 3.7 times improvement in tensile strength (89.8 MPa) and controlled reflectance properties. Additionally, we examined the hiding power and color difference of the CNF/PBAT films, and explored the underlying principle for the enhanced hydrophobicity, folding resistance, elongation and reflectance. Finally, the CNF/PBAT films exhibited stable comprehensive performance after we applied the films in drinking straws. The present study provides a facile strategy to prepare hydrophobic, folding resistant, reinforced and reflectance-controlled CNF films and could promote industrial use in the fields of glass film, beverage appliances, packaging, and flexible electronic devices. [Display omitted] • Increasing the layer spacing and porosity of CNF films by mixing with SiO2. • Mechanical, elongation, folding and reflectance properties of prepared composite improved markedly. • CNF/PBAT films display a controlled adjustment in reflectance, hiding power, and color difference. • CNF/PBAT films provide stability for packaging, electronics and other advanced applications. [ABSTRACT FROM AUTHOR]

• Melamine modified carbon dots (Me-CDs) exhibits 92.36% corrosion inhibition efficiency on carbon steel in neutral medium. • Adsorption isotherm of Me-CDs conforms to Temkin adsorption model, involving both chemisorption and physisorption. • Hydrophobic Me-CDs film adheres on carbon steel via coordinate-covalent bond and multilayer accumulation effect. Melamine modified carbon dots (Me-CDs) was synthesized by hydrothermal method and used as effective corrosion inhibitor for Q235 carbon steel in 3.5 wt% sodium chloride (NaCl) solution. The microstructure and surface properties of Me-CDs were characterized using XRD, FTIR, XPS and TEM. The corrosion inhibition behavior and mechanism of Me-CDs for carbon steel were investigated using weight loss and electrochemical methods, in combination with some surface characterizations (including SEM, AFM and contact angle tester). Results showed that Me-CDs as mixed-type adsorbent inhibitor could effectively prevent carbon steel from corrosion, and the maximum corrosion inhibition efficiency can reach 92.36% at 200 mg/L. The absorption of Me-CDs conformed to Temkin adsorption model, involving both chemisorption and physisorption. Based on the results of characterization analysis, the chemisorption from multiple adsorption centers, physisorption by blocking and barrier effect, and the formation of hydrophobic film on the surface of carbon steel was proposed to clarify the corrosion inhibition mechanism of Me-CDs. [ABSTRACT FROM AUTHOR]

Low-cost and scalable fabrication processes are needed to prepare efficient superhydrophobic materials, particularly for oil/water separation and metal protection against severe oil spills and metal corrosion. Here, an effective oil/water separation mesh with long-lasting acid/base durability and corrosive resistance is reported. In this work, the mesh was fabricated by simply spraying nano soil particles cross-linked with melamine resin and impregnating them with polyethylene (PE) solution. The multi-layered morphology obtained from the spraying and impregnating process which provides the unique wetting properties for the stainless steel (SS) mesh, such as superhydrophobicity and low water adhesion. Also the low chemical activity of alkyl sp3 carbon-hydrogen bonds provides acid/base resistance for the manufactured material. By utilizing these unique properties, not only can gravity-driven efficient oil/corrosive fluid separation be achieved, but the fabricated superhydrophobic stainless steel (SSS) mesh retains high separation efficiency (> 99%) and superhydrophobicity (water contact angle, WCA > 150°) in reuse process of wastewater in treated oil. More importantly, this excellent protection can effectively reduce the corrosion rate of the mesh by more than two orders of magnitude (SS mesh i corr 1.82 × 10−8 A·cm−2; SSS mesh i corr 9.84 × 10−11 A·cm−2) which providing a long-lasting protection even after 16 days of immersion in 3.5 wt% NaCl solution. All in all, the easy operation, acid/base resistance, high separation efficiency, and corrosion inhibition efficiency of the SSS mesh give them great potential for oil/water separation and metal protection applications. [Display omitted] [ABSTRACT FROM AUTHOR]