Spray Coating Of Superhydrophobic Coatings For Advanced Applications

This book guides readers through superhydrophobic coating fabrication and thier application, representing the latest significant advances in this important topic.

Superhydrophobic Polymer Coatings: Fundamentals, Design, Fabrication, and Applications offers a comprehensive overview of the preparation and applications of polymer coatings with superhydrophobicity, guiding the reader through advanced techniques and scientific principles. Sections present detailed information on the fundamental theories and methods behind the preparation of superhydrophobic polymer coatings and demonstrate the current and potential applications of these materials, covering a range of novel and marketable uses across industry, including coatings with properties such as foul resistance and self-cleaning, anti-icing and ice-release, corrosion inhibition, antibacterial, anti-reflection, slip and drag reduction, oil-water separation, and advanced medical applications. This book is a highly valuable resource for academic researchers, scientists and advanced students working on polymer coatings or polymer surface modifications, as well as professionals across polymer science, polymer chemistry, plastics engineering, and materials science. The detailed information in this book will also be of great interest to scientists, R&D professionals, product designers and engineers who are looking to develop products with superhydrophobic coatings. Presents in-depth information on the advanced methods required in the preparation of superhydrophobic polymer coatings Covers the latest advances in the design of polymer coatings with superhydrophobic properties, including nanofabrication Explains cutting-edge industrial and medical applications, including self-cleaning coatings, corrosion inhibition, anti-icing and ice-release, and oil-water separation

This book provides the latest information about the research being conducted and established solutions available in the field of thermal spray coatings for various engineering applications. The readers of this book will be mainly the graduates, engineers and researchers who are pursuing their carrier in the field of thermal spraying. This book will cover the studies and research works of reputed scientists and engineers who have developed thermal spray coatings for thermal protection, bio-implants, renewal energy, wear and corrosion in hydraulic turbines and jet engines, hydrophobic surfaces etc. Hence, the book serves as a valuable resource of latest advancement in thermal spray technology and consolidated references for aspirants and professionals of surface engineering community. The book covers following topics for different industrial applications: Introduction: Historical developments, Science and Engineering aspects of thermal spray coating technology and different thermal spray coatings techniques and its comparison with other fabrication processes. Recent advancements and applications of thermal spray coatings Cold spray technology for additive manufacturing. High-temperature corrosion and erosion resistant coatings and thermal barrier coatings for power plants, automotive sector, and jet engines. Erosion and corrosion-resistant coatings for hydro-power plants, offshore, chemical and oil industries. Bio-coatings for human body implants. Thermal spray coating for super-hydrophobic surface. 3. Case study of boiler tubes failure and prevention by thermal spray coatings.

Bio-inspired superhydrophobic coatings exhibit exceptional nonwetting properties, characterized by a large contact angle and minimal contact angle hysteresis. As a result, they have generated significant interest across diverse fields. This book explores advancements in superhydrophobic coatings, including their fabrication and application. It specifically addresses environmentally friendly chemicals for fabricating superhydrophobic coatings. Moreover, it delves into the application of superhydrophobic coatings in various scenarios, including anti-icing, anti-biofouling, and gas–liquid separation. By addressing these topics, the book offers a comprehensive overview of the historical background and progress made in the realm of superhydrophobic coatings. Furthermore, it serves as a rallying call to scientists worldwide, urging collaborative efforts to overcome development barriers and explore new application domains for the lotus-inspired superhydrophobic coating.

The possibility of using supercritical carbon dioxide (scCO2) as the primary solvent in a spray process for producing superhydrophobic surfaces have been examined in this work. Using scCO2 as solvent will have considerably lower environmental impact compared to an organic solvent since scCO2 is considered a green solvent as it is non-toxic, non-flammable and recyclable. To be able to work at the pressures needed to reach the supercritical state of carbon dioxide, a high-pressure technique called rapid expansion of supercritical solutions (RESS) has been used to produce the coatings. Fluorinated compounds are often used when producing superhydrophobic coatings due to their intrinsic water repellent properties, but generally these compound do not degrade in nature. Due to this, a wax and a biodegradable polymer have been used as the coating materials in this work. Two RESS set-ups were used to spray a polymer from solutions of scCO2 and acetone. The first system was based on a continuous flow of the solvent mixture and the polymer particles were collected on silica surfaces. Some of the coatings had superhydrophobic properties and the limitation with this technique was the loss of particles between the nozzle and the surface. In the second set-up, RESS was combined with electrostatic deposition (ED) to improve the particle collection. Different processing parameters were examined and most of the RESS-ED sprayed surfaces were superhydrophobic. This was demonstrated by high contact angles against water, low contact angle hysteresis and low tilt angles at which a water droplet rolls off the surface. It was also shown that the surface structures created when spraying using RESS-ED induced the important two-level roughness that was needed to achieve superhydrophobicity. A semi-continuous process for scaling-up the RESS system when spraying the wax has been developed. Temperature and pressure was investigated to find the highest solubility of the wax in scCO2, and 250 bar and 67 °C resulted in the largest amount of sprayed wax. It was also shown that the system is suitable for spray-coating the wax on different substrates such as glass, paper, aluminium etc. since all of these surfaces showed superhydrophobic properties. The wear resistance of the coatings were examined by different methods. Scratch resistance, vertical compression and the friction between the surface and a finger were analysed. The polymer coated surfaces showed a larger robustness compared with the wax surfaces in the scratch tests. The superhydrophobicity was lost for the wax coatings exposed to compression loads above 59 kPa and in the frictions test, one finger stroke over the coating destroyed the surface roughness. Finally, the wax surfaces were investigated as coating barriers to protect steel from corrosion. The superhydrophobic coating was stable up to 10 days before corrosion of the steel started.

Superhydrophobic surfaces, with a water contact angle >150°, have attracted both academic and industrial interest due to their wide range of applications, such as water proofing, anti-fogging, antifouling, anti-icing, fluidic drag reduction and anti-corrosion. Currently the majority of superhydrophobic coatings are created using organic chemicals with low surface energy. However, the lack of mechanical strength and heat resistance prevents the use of these coatings in harsh environments. Quality superhydrophobic coatings developed using inorganic materials are therefore highly sought after. Ceramics are of particular interest due to their high mechanical strength, heat and corrosion resistance. Such superhydrophobic coatings have recently been successfully fabricated using a variety of ceramics and different approaches, and have shown the improved wear and tribocorrosion resistance properties. This Special Issue will focus on the recent developments in the fabrication of superhydrophobic coatings and their robustness against corrosion and wear resistance, but the original work on other properties of superhydrophobic coatings are also welcome. In particular, the topics of interest include, but are not limited to: - Robust superhydrophobic coatings; - Coatings with super-wettability in multifunctional applications; - Wetting effects on corrosion and tribology; - Hierarchical Coating for wetting and modelling

In engineering, there are often situations in which the material of the main component is unable to sustain long life or protect itself from adverse operating environments. Moreover, in some cases, different material properties such as anti-friction and wear, anti-corrosive, thermal resistive, super hydrophobic, etc. are required as per the operating conditions. If those bulk components are made of such materials and possess those properties, the cost will be very high. In such cases, a practical solution is surface coating, which serves as a protective barrier to the bulk material from the adverse environment. In the last decade, with enormous effort, researchers and scientists have developed suitable materials to overcome those unfavorable operating conditions, and they have used advanced deposition techniques to enhance the adhesion and surface texturing of the coatings. Advanced Surface Coating Techniques for Modern Industrial Applications is a highly sought reference source that compiles the recent research trends in these new and emerging surface coating materials, deposition techniques, properties of coated materials, and their applications in various engineering and industrial fields. The book particularly focuses on 1) coating materials including anti-corrosive materials and nanomaterials, 2) coating methods including thermal spray and electroless disposition, and 3) applications such as surface engineering and thin film application. The book is ideal for engineers, scientists, researchers, academicians, and students working in fields like material science, mechanical engineering, tribology, chemical and corrosion science, bio-medical engineering, biomaterials, and aerospace engineering.