Hydrophobic and superhydrophobic coatings for corrosion protection of steel lina ejenstam doctoral thesis, 2015 kth royal institute of technology school of chemical science and engineering department of chemistry division of surface and corrosion science 100 44, stockholm, sweden. Superhydrophobic materials are defined as having a water contact angle more than 150 degrees, where 0 degrees is a puddle and 180 degrees is a sphere of water just touching the surface at a. Superhydrophobic surfaces have evoked great interest in researchers for both purely academic pursuits and industrial applications. Superhydrophobic surfaces water contact angles higher than 150a. Although bulk superhydrophobic materials are considered as promising candidates because of their durable antiwetting properties, they still face some challenges such as complicated fabrication processes and inherent brittleness. Surfaces and interfaces of biomimetic superhydrophobic. Superhydrophobic surfaces biosurfaces wiley online library. Fabrication of biomimetic superhydrophobic surface on. Another area of research group pertains to the nonequilibrium dynamics of dense suspensions and nanostructured materials. Imagination station, toledos handson science center, is a vital nonprofit organization that is an integral part of toledos economic, educational and social landscape. Fabrication of superhydrophobic surfaces on engineering materials.
A superhydrophobic coating is a thin surface layer that repels water. Superhydrophobic and superhydrophilic plant surfaces. The improved national image of twente has stimulated an increase in sales of regional products. With unique waterrepellent and selfcleaning properties, engineering metallic materials with superhydrophobicity endows them with greatly enhanced corrosion resistance. Jing li and zhiguang guo, fabrication of functional superhydrophobic engineering materials via an extremely rapid and simple route, chem. Twente is largely reliant on agriculture, next to services, and to a lesser degree on tourism. However, common preparation methods are timeconsuming, complex and costineffective. The properties of manmade superhydrophobic materials were reported in the 1970s and 1980s, and research has accelerated since the 1990s. Testing novel advanced material that have been engineered to be superhydrophobic, background information. Fabrication of functional superhydrophobic engineering. Superhydrophobic materials with micronanotextured surface have attracted tremendous attention owing to their potential applications such as selfcleaning, antifouling, antiicing, and corrosion prevention.
The wettability of the kaolin surface can be selectively controlled and regulated to different superwetting states by choosing the corresponding modification reagent. Using lasers to create superhydrophobic materials youtube. It is a fact that a fullscale introduction of the applications of biomimetic superhydrophobic materials is beyond us. Superhydrophobic surfaces have drawn attention from scientists and engineers because of their extreme water repellency. Structurally modified superhydrophobic surfaces have become particularly desirable as stable antibacterial surfaces. 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 selfcleaning, antiicing and icerelease, corrosion inhibition, antibacterial, antireflection, slip and drag reduction, oilwater separation, and advanced. In their perspective article in the journal science, researchers from aalto university call for consistent and standardized testing of superhydrophobic, i.
Shrinkinduced superhydrophobic and antibacterial surfaces. The book serves as a reference for the manufacturing of materials. In this work, we have developed a facile and inexpensive method to fabricate a superhydrophobic surface with hierarchical nano and microstructures. To date, he has published more than 140 papers focusing on the surfaces and interfaces of superhydrophobic materials with more than 3000 times citations and h index 31. Purchase superhydrophobic polymer coatings 1st edition. We have reported an easy means in this paper to imitate the lotus leaf by constructing a superhydrophobic surface through a process combining both electroless galvanic deposition and selfassembly of noctadecanethiol. Superhydrophobic surfaces analyzes the fundamental. Superhydrophobic materials for biomedical applications.
A droplet striking these kinds of surfaces can fully rebound like an elastic ball, or pancake. New material is super waterresistant, cheap and safe. Inspired by nature, scientists began to mimic these natural templates and as a result a wide spectrum of biomimetic superhydrophobic surfaces are fabricated. The approaches to construct hierarchical micronanostructures such as.
Carbon coating on ti3sic2 with combined superhydrophobic and. High corrosion protection performance of a novel nonfluorinated biomimetic superhydrophobic znfe coating with echinopsis multiplexlike. Superhydrophobic materials rely upon highly rough surface morphologies in order to. Scientists at the university of rochester have used lasers to transform metals into extremely water repellent, or super hydrophobic, materials without the need for temporary coatings. Traditional superhydrophobic material use depends on two processes. Superhydrophobic and selflubricating carbon coating on. Superhydrophobic to superhydrophilic wetting control in graphene films. Ultrahydrophobic or superhydrophobic surfaces are highly hydrophobic, i.
As the starting material, kaolin is selectively and diversely fabricated to the superhydrophobic, superoleophobicsuperhydrophilic, and superamphiphobic materials, respectively. However, such a texture is fragile and readily damaged when the material is deformed, scratched, or sliced off. This book, however, exclusively covers hydrophobic and superhydrophobic. Science and engineering of superhydrophobic surfaces.
The superhydrophobic surface was prepared through spin coating of a mixture of nano and microsized calcium carbonate caco3 suspensions on a substrate, followed by modification of a lowsurfaceenergy monolayer of. Dr fuchao yang received his master degree from college of physics and electronic engineering at northwest normal university in 20. Students learn how plants create and use superhydrophobic surfaces in. Towards understanding why a superhydrophobic coating is needed by water striders. Superhydrophobic surfaces made from naturally derived. Understanding wettability and mechanisms of wetting transition are important for design and engineering of superhydrophobic. Water spilled on a superhydrophobic surface does not wet the surface, but simply rolls off. Finally, the obstacles and prospects of superhydrophobic civil engineering materials are stated and expected. As important and irreplaceable engineering materials, metals are widely used in our daily life. It thoroughly discusses many types of hydrophobic surfaces such as natural superhydrophobic.
The western twente town of nijverdal is the only place in the netherlands where gold was ever found. Design, fabrication, and applications by liangliang cao b. Surfaces and interfaces of biomimetic superhydrophobic materials. The book serves as a reference for the manufacturing of materials with superior waterrepellency, selfcleaning, anti. Such a micronanotextured surface is a key for high water repellency. Even more satisfactory properties can be obtained by combining these properties with superhydrophobic properties. Superhydrophobicity is the tendency of a surface to repel water drops.
Towards understanding why a superhydrophobic coating is. Superhydrophobic to superhydrophilic wetting control in. This is also referred to as the lotus effect, after the superhydrophobic leaves of the lotus plant. These topic labels come from the works of this person. Home books superhydrophobic surfaces fabrications to practical. A novel superhydrophobic surface based on lowdensity. This book is a highly valuable resource for academic researchers, scientists and advanced. Superhydrophobic polymer coatings 1st edition elsevier. Thus, it is challenging to develop superhydrophobic materials that can sustain high water repellency after experiencing such a mechanical deformation and damage. Fabrication of functional superhydrophobic engineering materials via an extremely rapid and simple route. It is made from superhydrophobic ultrahydrophobicity materials. These topic labels come from the works of this organisations members. Superhydrophobic polymer coatings on stainless steel remain in the heterogeneous wetting regime for more.
Droplets hitting this kind of coating can fully rebound. Also, as a mechanical engineering student, we learn which machining process is suitable for a particular type of material. Herein, a facile and controllable onestep electrodeposition approach was employed to fabricate a superhydrophobic surface shps on an aluminum. Provides an adequate blend of complex engineering concepts with indepth. This chapter discusses the basics of contact angle ca in contrast to natural phenomena present in the surrounding environment such as surfaces of lotus, rice and ramie leaves, correlations between the morphological features, mechanical properties and laplacean pressure, fabrication of artificial surfaces to mimic superhydrophobic surfaces and their potential applications. A facile method to prepare superhydrophobic coatings by. In the present study, we prepared a robust and flexible bulk superhydrophobic f. Superhydrophobic materials understanding the concept of hydrophobic and hydrophilic materials. Recent progress in preparation of superhydrophobic. Online videos have caught the publics imagination by showing people walking through mud. Superhydrophobic surfaces on engineering materials are prepared via a convenient. Because their selfcleaning and water resistant properties prohibit bacteria growth, structurally modified superhydrophobic surfaces obviate bacterial resistance common with chemical agents, and therefore a robust and stable means. Superhydrophobic materials maintain air at the solidliquid interface when in contact with water.
A robust and flexible bulk superhydrophobic material from. This chapter summarises evaluation methods and engineering procedures in. Superhydrophobic engineering materials provide a rapid and. In this feature article, the history of wettability theory is described firstly. Here, we have collected some best books on engineering materials or material science to help you learn this subject from basic to advanced. Fingerprint dive into the research topics where sustainable process technology is active. Superhydrophobic materials can be made in several ways by coating a surface with a superhydrophobic material, by nanostructuring a surface, by applying nanoparticles to a surface or by a combination of these. The book serves as a reference for the manufacturing of materials with superior. Examining natural superhydrophobic surfaces versus common surfaces. 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. It thoroughly discusses many types of hydrophobic surfaces such as natural superhydrophobic surfaces, superhydrophobic polymers, metallic superhydrophobic surfaces, biological interfaces, and advanced.
Students learn how plants create and use superhydrophobic surfaces in nature and how. Nickel is one of the engineering materials with desirable properties such as high corrosion resistance, hardness, and good magnetic properties, which can protect the copper substrate. Alkylsilane solgel technique is an important singlestep strategy to fabricate a superhydrophobic coating on engineering materials. More interestingly, these surfaces have also demonstrated an infinite influence on civil engineering materials. Students are introduced to superhydrophobic surfaces and the lotus effect. Bioinspired sustainable and durable superhydrophobic.
An additional stipulation sometimes included in the superhydrophobic definition, depending on the application, is a low. This method allows to create rough structures and also reduce surface energy by hydrolysis and condensation of alkylsilane, simultaneously deng et al. Stable biomimetic superhydrophobic engineering materials. Metal corrosion is a serious problem, both economically and operationally, for engineering systems such as aircraft, automobiles, pipelines, and naval vessels. Superhydrophobic surfaces analyzes the fundamental concepts of superhydrophobicity and gives insight into the design of superhydrophobic surfaces. Additionally, as water moves across the superhydrophobic surface, it picks up and carries away any foreign material, such as dust or dirt.
Hydrophobic and superhydrophobic coatings for corrosion. The book serves as a reference for the manufacturing of materials with superior waterrepellency, selfcleaning, antiicing and corrosion resistance. Fabrication of durable anticorrosion superhydrophobic. Approaches for evaluating and engineering resilient. Fingerprint dive into the research topics where rob g. State key laboratory of chemical resource engineering college of materials science and engineering beijing university of chemical technology, beijing 29 china.
Sustainable process technology university of twente. Over the past few years, the scientific community, as well as the worlds coatings industry has seen the introduction of oxidepolymerbased superhydrophobic surfaces and coatings with exceptional water repellency. However, such a texture is fragile and readily damaged when the material is deformed. Generally speaking, superhydrophobic coatings are made from composite materials where one component provides the roughness and the other provides low surface energy. Therefore, fabricating superhydrophobic surfaces on metal materials is of great significance, and applicable methods for industrial production are in urgent need. The research is focused towards design and synthesis of porous material, superhydrophobic surfaces and confined and interfacial fluids. The existing and potential uses of superhydrophobic and superhydrophilic surfaces for selfcleaning, drag reduction during moving in water, capillary liquid transport and other biomimetic materials are shown. It describes also different strategies for making superhydrophobic surfaces from a large diversity of materials polymers, metals and other inorganic materials, composites and processes lithographic techniques, electrochemical processes, selfassembly processes, colloidal particles, solgel processes, nanofilaments, or simple scraping. In nature one can find an array of impressive and elegant examples of superhydrophobic. The contact angles of a water droplet on an ultrahydrophobic material exceed 150. Nature has endowed many of its living systems with functional structures with highly tuned wettability.