Titania Based Photocatalytically Active Layer-by-layer Coatings on Model Surfaces and Textile Materials PDF Download
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Author: Dariya Dontsova
Publisher:
ISBN:
Category :
Languages : en
Pages : 204
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Book Description
The photocatalytic properties of commercially available and synthesized catalysts were studied for on-stream decomposition of a model odorous compound hydrogen sulphide (H2S) under UV-A and visible light irradiation. A simplified qualitative model for visualization of the catalyst deactivation is proposed. Further, catalysts were incorporated into multilayer films using different polyelectrolytes. Such films were characterized by ellipsometry, AFM, UV-visible spectroscopy and SEM on model surfaces. These films are homogeneous and transparent, and their porosity allow for almost free mass transport of the volatile compounds within the film. In order to test the photocatalytic activity of LbL films containing catalysts, such films were assembled on tubular glass reactors (with the diameter of 2.7 cm and the length of 40 cm) and subjected to H2S flow under UV-A irradiation. The activity of films was found to be proportional to the number of film constituent layers of catalyst and dependent on the chemical nature of the film constituent polyelectrolyte. After the film structure was optimized with respect to catalytic component and polyelectrolyte component, the most efficient films were deposited on cotton textiles, and their photocatalytic activity was measured for on-stream decomposition of H2S under visible light irradiation. Further, the potential applications of such LbL-coated textiles for the removal of other common indoor pollutants were exemplified by decomposition of acetaldehyde, methyl ethyl ketone and ammonia gas under visible light irradiation.
Author: Dariya Dontsova
Publisher:
ISBN:
Category :
Languages : en
Pages : 204
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Book Description
The photocatalytic properties of commercially available and synthesized catalysts were studied for on-stream decomposition of a model odorous compound hydrogen sulphide (H2S) under UV-A and visible light irradiation. A simplified qualitative model for visualization of the catalyst deactivation is proposed. Further, catalysts were incorporated into multilayer films using different polyelectrolytes. Such films were characterized by ellipsometry, AFM, UV-visible spectroscopy and SEM on model surfaces. These films are homogeneous and transparent, and their porosity allow for almost free mass transport of the volatile compounds within the film. In order to test the photocatalytic activity of LbL films containing catalysts, such films were assembled on tubular glass reactors (with the diameter of 2.7 cm and the length of 40 cm) and subjected to H2S flow under UV-A irradiation. The activity of films was found to be proportional to the number of film constituent layers of catalyst and dependent on the chemical nature of the film constituent polyelectrolyte. After the film structure was optimized with respect to catalytic component and polyelectrolyte component, the most efficient films were deposited on cotton textiles, and their photocatalytic activity was measured for on-stream decomposition of H2S under visible light irradiation. Further, the potential applications of such LbL-coated textiles for the removal of other common indoor pollutants were exemplified by decomposition of acetaldehyde, methyl ethyl ketone and ammonia gas under visible light irradiation.
Author: Horst Kisch
Publisher: John Wiley & Sons
ISBN: 3527335536
Category : Science
Languages : en
Pages : 264
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Book Description
Focusing on the basic principles of semiconductor photocatalysis, this book also gives a brief introduction to photochemistry, photoelectrochemistry, and homogeneous photocatalysis. In addition, the author - one of the leading authorities in the field - presents important environmental and practical aspects. A valuable, one-stop source for all chemists, material scientists, and physicists working in this area, as well as novice researchers entering semiconductor photocatalysis.
Author: Marvin Motay
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
TiO2 and Ag nanoparticle multilayered films were constructed on model substrates and textiles via Layer-by-Layer (LbL) assembly. The TiO2 nanoparticle based films constructed on model substrates showed a non-conventional photocatalytic behaviour for gas phase formic acid mineralisation upon UV-A irradiation, and a high mineralisation was obtained for a single layer TiO2 nanoparticle film. These films also showed biocidal properties upon UV-A irradiation. The elaboration of a one-pot method, combining the photo-induced synthesis of Ag nanoparticles and the LbL deposition of TiO2 nanoparticle layer, allowed the direct synthesis of Ag nanoparticles within the films and a high enhancement of the film photocatalytic properties. The construction methods were successfully transfered on textile surfaces. The films were photocatalytically active and biocidal under UV-A irradiation after several washing treatment cycles.
Author: Marc Gardon Ramos
Publisher:
ISBN:
Category :
Languages : en
Pages : 315
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Book Description
The main subject of this thesis is the fabrication of functional titanium dioxide coatings by means of Atmospheric Plasma Spray (APS) and Cold Gas Spray (CGS). Functional role may be understood as the capacity of TiO2 surfaces to respond in a determined way under certain conditions. Firstly, conventional coating processes, sensing mechanisms and overall efficiencies were deeply studied. As regards to experimental results, it was observed that H2 contained in the plasma mixture could reduce TiO2 towards non stoichiometric or stoichiometric compounds such as titanium sub-oxides (TiO2-x) or Magnéli Phases (TinO2n-1) respectively during the in-flight of the particles. Large accumulation of oxygen vacancies in the crystal lattice of rutile led to a donor level to the conduction band. Therefore, a corrosion-resistant ceramic material with a low electrical resistivity was obtained on ceramic tiles. This unexpected procedure led to deposit APS TiO2-x / TinO2n-1 coatings on stainless steel and apply them in electrochemical bi-polar batteries. Then, from the created feedback thin stainless steel and aluminium films, carbon-polymer composites or nickel foams as common standard electrode materials were selected and coated. Produce the active layer of a metal oxide gas sensor using APS fed by TiO2 was still a target to be accomplished. With the aim of offering more innovation to conventional metal oxide sensors, it was determined to build-up the sensing layer on a thin polymeric flexible substrate. It was possible to reach certain spraying conditions that avoided thermal degradation of the polymer. Furthermore, heterogeneous disposition of the coating, where some areas were coated and certain spots uncoated provided electric contact between the electrodes and structure that eased elastic deformation of the film. Satisfactory performances were obtained testing the response of the device in front of a target gas and radiation. Thenceforth, transition to thermally less-aggressive technologies was carried out. It was decided to focus the efforts on CGS, which does not require melting the material for being deposited. Subsequently, nanostructured anatase was used as feedstock in order to achieve photocatalytic layers with large specific surfaces for applying them in the degradation of different contaminants. It was used a powder able to create chemical bonds with the substrate and among the particles at the impact. Unfortunately, feeding system was repeatedly clogged because of the high agglomerating capacity of the powder. Blends were prepared with copper and microstructured TiO2 that flowed appropriately so as to avoid the obstruction of the pipelines. First, Cu/nano-TiO2 coatings were deposited using spraying conditions that favoured the deposition of nanostructured anatase at the top surface, which assured the development of the photocatalytic process. Samples successfully degraded toluene in gaseous phase. On the other hand, micro-TiO2/nano-TiO2 blend was not suitably deposited onto steel. Ceramic particles may not deform plastically. Thus, chemical bonds with the substrate and among particles had to be boosted for building-up the coatings. Substrate surface based on APS TiO2-x with controlled roughness provided composition, hardness and required geometry for adhering nano-TiO2 particles. In this way, CGS nano-TiO2 coatings were tested for degrading phenol and formic acid in liquid phase. The obtained results equalized or even improved the performance of sol-gel coatings. Metallic Ti coatings were previously deposited onto the polymer by CGS for afterwards spraying nano-TiO2, following the know-how gained in CGS nano-TiO2 photocatalysts. Again, lower layer acted as a bond coat between the original substrate and nanostructured anatase. Osteblast cultures were tested on PEEK, CGS Ti on PEEK and CGS nano-TiO2 deposited on CGS Ti layer. Higher cell adhesion, proliferation and differentiation were obtained as long as CGS coatings were applied, which leads to an improved bioactivity of polymeric implants.
Author: Mahmood Aliofkhazraei
Publisher: Elsevier
ISBN: 0444632468
Category : Science
Languages : en
Pages : 555
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Book Description
Handbook of Modern Coating Technologies: Fabrication Methods and Functional Properties reviews different fabrication methods and functional properties of modern coating technologies. The topics in this volume consist of nanocoatings by sol–gel processes for functionalization of polymer surfaces and textiles and mechanical fabrication methods of nanostructured surfaces such surface mechanical attrition treatment, polymer nanofabrications and its plasma processing, chemical vapor deposition of oxide materials at atmospheric pressure, conventional chemical vapor deposition process at atmospheric pressure, feasibility of atmospheric pressure, chemical vapor deposition process, Langmuir–Blodgett technique, flame pyrolysis, confined-plume chemical deposition, electrophoretic deposition, in vitro and in vivo particle coating for oral targeting and drug delivery, novel coatings to improve the performance of multilayer biopolymeric films for food packaging, corrosion protection by nanostructured coatings, tribological behavior of electroless coatings, effect of peening-based processes on tribological and mechanical behavior of bioimplant materials, improved efficiency of ceramic cutting tools in machining hardened steel with nanostructured multilayered coatings, incorporation of elastomeric secondary phase into epoxy matrix influences mechanical properties of epoxy coatings, enhancement of biocompatibility by coatings, porous hydroxyapatite–based coatings, and bionic colloidal crystal coatings.
Author: Jinlian Hu
Publisher: Woodhead Publishing
ISBN: 0081002653
Category : Technology & Engineering
Languages : en
Pages : 486
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Book Description
Active Coatings for Smart Textiles presents the latest information on active materials and their application to textiles in the form of coatings and finishes for the purpose of improving performance and creating active functional effects. This important book provides detailed coverage of smart coating types, processes, and applications. After an introduction to the topic, Part One introduces various types of smart and active coatings, including memory polymer coatings, durable and self-cleaning coatings, and breathable coatings. Technologies and related processes for the application of coatings to textiles is the focus of Part Two, with chapters devoted to microencapsulation technology, plasma surface treatments, and nanotechnology-based treatments. The book ends with a section on applications of smart textiles with responsive coatings, which are increasingly finding commercial niches in sportswear, protective clothing, medical textiles, and architecture. - Introduces various types of smart and active coatings for textiles - Covers technologies and application processes for the coating and finishing of textiles - Reviews commercial applications of such coatings, including in sportswear, protective clothing, medical textiles and architecture
Author: Gang Sun
Publisher: Woodhead Publishing
ISBN: 0081005857
Category : Science
Languages : en
Pages : 374
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Book Description
Antimicrobial textiles have attracted a great deal of interest in recent years due to their potential for reducing the transmission of infection in medical and healthcare environments. Antimicrobial properties can also improve the performance and lifespan of consumer products, and so these fabrics are increasingly finding applications in the wider textile and apparel industry. This book provides systematic coverage of the technologies and materials required for developing these important textiles. In Part One, chapters address key issues and technologies in the creation of antimicrobial textile products. Topics covered include testing and regulation, microencapsulation, sol-gel coating and plasma technologies, nanotechnology and life cycle assessment. Part Two then reviews key antimicrobial agents, such as N-halamines, plant based compounds and photo-active chemicals. Finally, the chapters of Part Three offer detailed reviews of antimicrobial textiles for particular important applications, including medical devices, protective clothing and products with improved durability and longevity. - Reviews key issues and technologies in the creation of antimicrobial textile products - Offered a detailed overview of by antimicrobial agents and a wide range of important applications - Produced by an experienced editor and a distinguished and international team of contributors
Author: Jean Cornier
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110670860
Category : Science
Languages : en
Pages : 427
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Book Description
Functionalization of material systems is one of the key developments nowadays in the textile industry, where particles are frequently used to enhance the properties of fibers and to add new functionalities. This book focuses on innovative textile materials and is a perfect guide for professionals in the textile industry and scientists alike. An overview of particle technology is provided before addressing all topics relevant to particle-enhanced textiles, i.e. the properties and application of micro/nanoparticles in textiles, production techniques, safety, as well as regulatory and intellectual property aspects. The book covers the composition and applications of various types of textile fillers, finishings, and microfibers. gives an outlook on future trends and challenges in the research, development, and production of nano- and micro-enabled textiles. The authors of the book, who are leading experts in their fields, address many aspects relevant to the use of particle-enhanced textiles in industrial applications as well as in our daily life. A particular emphasis is put on practical examples of applications and products, safety and sustainability issues and the potential for further innovation. This book should bring inspiration for textile scientists in using particles for improving textiles and further expanding their possibilities of use.
Author: Dongfang Yang
Publisher: BoD – Books on Demand
ISBN: 1789233267
Category : Technology & Engineering
Languages : en
Pages : 520
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Book Description
Titanium dioxide is currently being used in many industrial products. It provides unique photocatalytic properties for water splitting and purification, bacterial inactivation, and organics degradation. It has also been widely used as the photoanode for dye-sensitized solar cells and coatings for self-cleaning surfaces, biomedical implants, and nanomedicine. This book covers various aspects of titanium dioxide nanomaterials including their unique one-dimensional, two-dimensional, mesoporous, and hierarchical nanostructures and their synthetic methods such as sol-gel, hydrothermal, anodic oxidation, and electrophoretic deposition, as well as its key applications in environmental and energy sectors. Through these 24 chapters written by experts from the international scientific community, readers will have access to a comprehensive overview of the recent research and development findings on the titanium dioxide nanomaterials.
Author: David Levy
Publisher: John Wiley & Sons
ISBN: 3527334866
Category : Technology & Engineering
Languages : en
Pages : 1604
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Book Description
This comprehensive three-volume handbook brings together a review of the current state together with the latest developments in sol-gel technology to put forward new ideas. The first volume, dedicated to synthesis and shaping, gives an in-depth overview of the wet-chemical processes that constitute the core of the sol-gel method and presents the various pathways for the successful synthesis of inorganic and hybrid organic-inorganic materials, bio- and bio-inspired materials, powders, particles and fibers as well as sol-gel derived thin films, coatings and surfaces. The second volume deals with the mechanical, optical, electrical and magnetic properties of sol-gel derived materials and the methods for their characterization such as diffraction methods and nuclear magnetic resonance, infrared and Raman spectroscopies. The third volume concentrates on the various applications in the fields of membrane science, catalysis, energy research, biomaterials science, biomedicine, photonics and electronics.
