Enhanced super-hydrophobicity and corrosion resistance of the one-step hydrothermal synthesized coating on the Mg-9Li alloy: Role of the solid-solution treated substrate

Abstract Superhydrophobic surface (SHS) fabrication has gained popularity as a corrosion prevention method for metals in recent years. Because of the vast range of sectors that are interested in and using nature-inspired biomimetic SHS, this field of advanced materials science is experiencing rapid growth. Corrosion prevention can be achieved with SHS because it effectively blocks moisture from entering. By generating an air layer between the metal and the coating, SHS provides corrosion prevention. Corrosion-inducing ions are less likely to adhere to metal surfaces with low surface energy and high surface roughness. Combining the right materials and fabrication methods allows you to fine-tune SHS’s many unique features. This review article provides a survey of the superhydrophobic coatings’ performances as metallic protection. Then, various models were utilized to assess the wettability of the rough surface, and the relations governing the contact angle (CA) were reported. Lastly, various methods utilized to prepare the superhydrophobic coatings and their effects on the corrosion processes for metals were also discussed.

The new trends in corrosion control using superhydrophobic surfaces: a review

Magnesium (Mg) and its alloys, which have good mechanical properties and damping capacities, are considered as potential candidate materials in the industrial field. Nevertheless, fast corrosion is the main obstacle that seriously hinders its wide applications. Surface modification is an available method to avoid the contact between corrosive media and Mg substrates, thus extending the service life of Mg-based materials. Generally, manufacturing a dense and stable coating as physical barriers can effectively inhibit the corrosion of Mg substrates; however, in some complex service environments, physical barrier coating only may not satisfy the long-term service of Mg alloys. In this case, it is very important to endow the coating with suitable functional characteristics, such as superhydrophobic and self-healing properties. In this review, the various surface treatments reported are presented first, followed by the methods employed for developing superhydrophobic surfaces with micro/nanostructuring, and an overview of the various advanced self-healing coatings, devolved on Mg alloys in the past decade, is further summarized. The corresponding preparation strategies and protection mechanisms of functional coatings are further discussed. A potential research direction is also briefly proposed to help guide functional strategies and inspire further innovations. It is hoped that the summary of this paper will be helpful to the surface modification of Mg alloys and promote the further development of this emerging research field.

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Recent Progress in Functionalized Coatings for Corrosion Protection of Magnesium Alloys—A Review

As an emerging fringe science, bionics integrates the understanding of nature, imitation of nature, and surpassing nature in one aspect, and it organically combines the synergistic complementarity of function and structure–function integrated materials which is of great scientific interest. By imitating the microstructure of a natural biological surface, the bionic superhydrophobic surface prepared by human beings has the properties of self-cleaning, anti-icing, water collection, anti-corrosion and oil–water separation, and the preparation research methods are increasing. The preparation methods of superhydrophobic surface include vapor deposition, etching modification, sol–gel, template, electrostatic spinning, and electrostatic spraying, which can be applied to fields such as medical care, military industry, ship industry, and textile. The etching modification method can directly modify the substrate, so there is no need to worry about the adhesion between the coating and the substrate. The most obvious advantage of this method is that the obtained superhydrophobic surface is integrated with the substrate and has good stability and corrosion resistance. In this article, the different preparation methods of bionic superhydrophobic materials were summarized, especially the etching modification methods, we discussed the detailed classification, advantages, and disadvantages of these methods, and the future development direction of the field was prospected.

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Biomimetic superhydrophobic metal/nonmetal surface manufactured by etching methods: A mini review

Novel fabrication of robust superhydrophobic polyester fabric with eugenol based on thiol-ene click chemistry for self-cleaning and water–oil separation

Influence of materials and fabrication strategies in tailoring the anticorrosive property of superhydrophobic coatings

The detection of chemical species and understanding their respective localisations in tissues have important implications in plant science. The conventional methods for imaging spatial localisation of chemical species are often restricted by the number of species that can be identified and is mostly done in a targeted manner. Mass spectrometry imaging combines the ability of traditional mass spectrometry to detect numerous chemical species in a sample with their spatial localisation information by analysing the specimen in a 2D manner. This article details the popular mass spectrometry imaging methodologies which are widely pursued along with their respective sample preparation and the data analysis methods that are commonly used. We also review the advancements through the years in the usage of the technique for the spatial profiling of endogenous metabolites, detection of xenobiotic agrochemicals and disease detection in plants. As an actively pursued area of research, we also address the hurdles in the analysis of plant tissues, the future scopes and an integrated approach to analyse samples combining different mass spectrometry imaging methods to obtain the most information from a sample of interest.

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Mass Spectrometry Imaging for Spatial Chemical Profiling of Vegetative Parts of Plants

Molybdenum disulfide (MoS2) is a promising alternative electrocatalyst for hydrogen evolution reaction (HER) due to its relatively near zero hydrogen adsorption free energy (ΔGH = 0.08) and availability as a metallic (1T) phase. The superior catalytic activity of the 1T phase over 2H is owing to the availability of dense active sites, 107 fold higher conductivity, and greater hydrophilicity. However, in the synthesis of 1T-MoS2, a highly controlled proficient method is indispensable due to its metastable nature. Besides, phase enrichment is greatly sensitive to experimental parameters such as precursor, temperature, reaction time, and solvent. In the context of precursors, to date, no single precursor has been recognized as a selective precursor for the synthesis of 1T-MoS2. In this work, MoS2 with high content of 1T phase (79.4%) and excessive bridging S22-/apical S2- sites has been formulated from a single precursor, that is, ammonium tetrathiomolybdate ((NH4)2MoS4), ATTM). In HER, it displayed an inspired activity, that is, achieving 10 mA cm-2 current density, it requires just 248 mV overpotential with a minimal Tafel slope value (56 mV/dec). The maximum enrichment of the 1T phase, abundant accumulation of catalytically active bridging S22-/apical S2- sites, and the complete reduction of Mo+6 to Mo+4 (absence of Mo+6) are root causes for the outstanding activity of the synthesized 1T phase-domain MoS2. To the best of our knowledge for the very first time, here, we declare that the single source, that is, ATTM is an exclusive precursor for the selective synthesis of 1T-MoS2 with advantageous structural features. Moreover, this expedient precursor could be more pertinent for the industrial-scale preparation of 1T phase-domain MoS2 in near future.

Akhila Ajith

Papers

Influence of materials and fabrication strategies in tailoring the anticorrosive property of superhydrophobic coatings

Mass Spectrometry Imaging for Spatial Chemical Profiling of Vegetative Parts of Plants

Tailoring of 1T Phase-Domain MoS2 Active Sites with Bridging S22-/Apical S2- Phase-Selective Precursor Modulation for Enriched HER Kinetics.