One-step electrodeposition to fabricate superhydrophobic coating and its reversible wettability transformation

Abstract

A one-step electrodeposition method was utilized to fabricate coatings with switchable wettability on stainless steel meshes to extend the application of materials in the intelligent material industry. This method did not involve low surface energy materials and had advantages of simple and good repeatable. Through changing pH value, deposition temperature and voltage, the relationship between morphology and wettability of the as-prepared coatings were studied. The SEM results show numbers of particles on the coatings under the optimum condition and some of them aggregated into micropine hierarchical structures. The coatings achieved superhydrophobicity with a contact angle of 155.5°. After being placed at 450°C for 3 h, the superhydrophobic film turned into superhydrophilic. The film regained superhydrophobicity after hydrothermal treatment in glucose aqueous solution, which exhibited a reversible transition between superhydrophobicity and superhydrophilicity. In addition, the superhydrophilic coatings could be used to separate light oil, such as diesel, gasoline, toluene, benzene and lubricants, excellent oil-water separation ability of 95%.

Dynamic Electrolyte Spreading during Meniscus-Confined Electrodeposition and Electrodissolution of Copper for Surface Patterning

“…The presence of copper oxides on the sample surface can be attributed to the heat treatment process. 8,25,27,29 As reported in earlier studies, 34,35 Cu 2 O presents with relatively hydrophobic behavior as compared to pure copper and cupric oxide (CuO). Furthermore, XPS also showed the presence of carbon (C 1s) which can be attributed to the adventitious carbon adsorbed on the surface upon air exposure.…”

“…The Cu 2p spectrum in both the Cu-SHO (Figure (h)) and Cu–P (Figure (i)) showed a similar shape with two major broad peaks corresponding to Cu 2p 1/2 and Cu 2p 3/2 along with satellite peaks. − The deconvolution of the peaks revealed the existence of Cu as Cu/Cu 2 O (Cu/Cu + ) and CuO (Cu 2+ ), with Cu/Cu 2 O­(Cu/Cu + ) being the dominant form in both cases. The presence of copper oxides on the sample surface can be attributed to the heat treatment process. ,,, As reported in earlier studies, , Cu 2 O presents with relatively hydrophobic behavior as compared to pure copper and cupric oxide (CuO). Furthermore, XPS also showed the presence of carbon (C 1s) which can be attributed to the adventitious carbon adsorbed on the surface upon air exposure.…”

Transparent Air Filters with Active Thermal Sterilization

“…CNAF showed enhanced hydrophobicity with a contact angle of 148.3° compared to the N95 mask (130.5°). Seemingly, it could be attributed to hydrophobic Cu 2 O layer formed on CuNWs during post thermal annealing process …”

“…Seemingly, it could be attributed to hydrophobic Cu 2 O layer formed on CuNWs during post thermal annealing process. 34 Overall filtration performances of CNAF were evaluated by a custom-built test setup (Figure S3). Basically, CNAF operates in mechanical filtration mode (M-mode), which is dependent on mechanical capturing mechanisms such as Brownian diffusion, interception, and impaction.…”

Atmospheric pressure plasma engineered superhydrophilic CuO surfaces with enhanced catalytic activities

“…[38] Techniques like high temperature annealing (450 C for 3hour), low pressure oxygen plasma treatment have been used to transform hydrophobic CuO surfaces to super-hydrophilic. [39,40] Recently we have reported ultra-thin ultrathin p-type cupric oxide (CuO) enhances the performance and stability of solution-processed CZCTS thin films Solar Cells. [41] Plasma functionalisation of this CuO intermediate layer could be an effective approach to enhance the efficiencies of similar solution processed devices, where surface hydrophilicity dictates the interfacial charge transfer between layers.…”