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Author : Ugo Lafont
Publisher :
ISBN 13 :
Total Pages : 206 pages
Book Rating : 4.:/5 (116 download)
Download or read book Oxydes de titane mésoporeux written by Ugo Lafont and published by . This book was released on 2003 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 478 pages
Book Rating : 4.:/5 (7 download)
Download or read book Canadian Journal of Chemistry written by and published by . This book was released on 2005 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Issam Naboulsi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (13 download)
Download or read book Synthèse et caractérisation d'oxyde de titane et de zirconium mésoporeux written by Issam Naboulsi and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans ce travail, nous nous sommes tout d'abord intéressés à l'influence du traitement de la mésophase hybride sous ammoniac et des conditions de cristallisation sur les propriétés d'oxydes de titane mésoporeux. Le protocole de synthèse de ces matériaux a été mis au point auparavant au laboratoire à l'aide d'une méthode combinant le mécanisme transcriptif à partir des cristaux liquides du copolymère bloc P123 et la méthode EISA. Une cristallisation sous atmosphère oxydante, augmente le degré de cristallinité et favorise une croissance des particules d'anatase. En conséquence, la photodégradation du méthylorange, utilisé comme molécule modèle est augmentée. Lorsque la cristallisation est réalisée sous azote pur, l'anatase n'est pas favorisée et la photoactivité est alors gouvernée par la surface spécifique des matériaux. Nous avons également montré qu'au cours de la synthèse, l'interaction de NH3 avec le titane amorphe promeut la formation de la structure rutile de TiO2 et défavorise par conséquent la cristallisation sous forme anatase. Par conséquent lorsque le traitement sous ammoniac de la mésophase hybride est prolongé ou lorsqu' il est réalisé à pression élevée, l'activité photocatalytique des oxydes de titane, obtenus après cristallisation du TiO2 amorphe sous air synthétique, diminue. L'introduction d'un second niveau de mésoporisité permet d'accroitre l'efficacité des photocatalyseurs, car la diffusion et l'accès aux sites actifs des molécules de colorant sont améliorés. Les matériaux à double mésoporisité présentent une activité photocatalytique deux fois et demie supérieure à celle des oxydes de titane mésoporeux monomodaux. Des catalyseurs pour l'hydrodésulfuration des gazoles ont également étés conçus en dispersant la phase active MoS2 à la surface des oxydes de titane mésoporeux mono- et bimodaux. Le dibenzothiophène (DBT) et le 4,6-diméthylbenzodiophène (46DMDBT) ont été utilisées comme molécules modèles. Contrairement au catalyseur conventionnel MoS2/Al2O3, pour lequel l'hydrodésulfuration se produite selon la voie hydrogénante, grâce à la présence de sites acides de Brönsted, les catalyseurs supportés sur TiO2 mésoporeux favorisent la désulfurisation directe du 46DMDBT. Pour terminer, la méthode de synthèse mise au point pour TiO2 a été transposée à l'oxyde de zirconium. Toutefois, dans ce cas seul un arrangement vermiforme des canaux est obtenu. Ce phénomène est probablement lié à la présence du propanol contenu dans la source du précurseur inorganique. L'incorporation d'étain au sein des zircones mésoporeuses a également été réalisée et nous avons mis en évidence que cet élément est favorable à la cristallisation de ZrO2.
Author : Karen Wilson
Publisher : John Wiley & Sons
ISBN 13 : 3527659005
Total Pages : 466 pages
Book Rating : 4.5/5 (276 download)
Download or read book Heterogeneous Catalysts for Clean Technology written by Karen Wilson and published by John Wiley & Sons. This book was released on 2013-09-17 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reactive, but not a reactant. Heterogeneous catalysts play an unseen role in many of today's processes and products. With the increasing emphasis on sustainability in both products and processes, this handbook is the first to combine the hot topics of heterogeneous catalysis and clean technology. It focuses on the development of heterogeneous catalysts for use in clean chemical synthesis, dealing with how modern spectroscopic techniques can aid the design of catalysts for use in liquid phase reactions, their application in industrially important chemistries - including selective oxidation, hydrogenation, solid acid- and base-catalyzed processes - as well as the role of process intensification and use of renewable resources in improving the sustainability of chemical processes. With its emphasis on applications, this book is of high interest to those working in the industry.
Author : Christina Knöfel
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.:/5 (494 download)
Download or read book Synthesis, characterisation and evaluation of porous materials for the adsorption of carbon dioxide written by Christina Knöfel and published by . This book was released on 2009 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans ce travail, des oxydes mesoporeux, tels que silice, oxyde de titane et oxyde de zircone ont été synthétisés en utilisant un copolymère à triblock comme agent structurant. De plus, la silice et l’oxyde de titane ont été fonctionnalisés avec différentes molécules d'aminosilane. La caractérisation des matériaux préparés a été effectuée par diverses méthodes, telles que la sorption d'azote, la spectroscopie infrarouge (ATR) et la diffraction des rayons X. Les matériaux ont été examinés pour leurs propriétés d'adsorption du dioxyde de carbone utilisant principalement la microcalorimétrie. Dans certains cas, des mesures de spectroscopie IR in-situ et des calculs théoriques de DFT ont été effectués pour mieux comprendre les résultats obtenus par microcalorimétrie d’adsorption. En ce qui concerne les différentes propriétés d'adsorption nous avons mis en évidence que la functionalisation des emplacements d'amine sur les matériaux de silice a amélioré de manière significative les capacités d'adsorption. Une comparaison des différents oxydes a confirmé que les propriétés d'adsorption dépendent principalement de la force du lien du métal-oxygène dans les oxydes mais également des caractéristiques de texture, telles que la porosité.
Author : Michel Andre Aegerter
Publisher : Springer Science & Business Media
ISBN 13 : 1441975896
Total Pages : 929 pages
Book Rating : 4.4/5 (419 download)
Download or read book Aerogels Handbook written by Michel Andre Aegerter and published by Springer Science & Business Media. This book was released on 2011-06-10 with total page 929 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerogels are the lightest solids known. Up to 1000 times lighter than glass and with a density as low as only four times that of air, they show very high thermal, electrical and acoustic insulation values and hold many entries in Guinness World Records. Originally based on silica, R&D efforts have extended this class of materials to non-silicate inorganic oxides, natural and synthetic organic polymers, carbon, metal and ceramic materials, etc. Composite systems involving polymer-crosslinked aerogels and interpenetrating hybrid networks have been developed and exhibit remarkable mechanical strength and flexibility. Even more exotic aerogels based on clays, chalcogenides, phosphides, quantum dots, and biopolymers such as chitosan are opening new applications for the construction, transportation, energy, defense and healthcare industries. Applications in electronics, chemistry, mechanics, engineering, energy production and storage, sensors, medicine, nanotechnology, military and aerospace, oil and gas recovery, thermal insulation and household uses are being developed with an estimated annual market growth rate of around 70% until 2015. The Aerogels Handbook summarizes state-of-the-art developments and processing of inorganic, organic, and composite aerogels, including the most important methods of synthesis, characterization as well as their typical applications and their possible market impact. Readers will find an exhaustive overview of all aerogel materials known today, their fabrication, upscaling aspects, physical and chemical properties, and most recent advances towards applications and commercial products, some of which are commercially available today. Key Features: •Edited and written by recognized worldwide leaders in the field •Appeals to a broad audience of materials scientists, chemists, and engineers in academic research and industrial R&D •Covers inorganic, organic, and composite aerogels •Describes military, aerospace, building industry, household, environmental, energy, and biomedical applications among others
Author : Carine Assaker
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (893 download)
Download or read book Synthèse et caractérisation de titanates mésoporeux organisés written by Carine Assaker and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans ce travail, les propriétés des oxydes de titane mésoporeux organisés ont été étudiées en détail. La synthèse de ces matériaux a été mise au point auparavant au laboratoire à l'aide d'une méthode combinant le mécanisme transcriptif à partir des cristaux liquides du copolymère bloc P123 et la méthode EISA. Tout d'abord, une optimisation des conditions d'élimination du tensioactif a été effectuée en testant des méthodes d'extraction à partir de solvant et des méthodes thermiques. L'élimination du P123 par l'eau suivie d'un rinçage à l'acétone est efficace, simple et rapide et en même temps favorise la formation de la phase anatase du TiO2. Par contre, les propriétés photocatalytiques de ces TiO2 extraits à l'eau sont médiocres et ne sont améliorées qu'après calcination. En combinant une extraction du P123 à l'eau avec une calcination les oxydes de titane mésoporeux possédent une meilleure activité photocatalytique que celle de l'anatase commercial. Dans un second temps l'incorporation du zinc et du tungstène dans les TiO2 mésoporeux organisés a été investie dans le but d'améliorer leur activité photocatalytique. L'introduction de faibles quantités de zinc (
Author : Renata Solarska
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (428 download)
Download or read book Properties and Applications of Mesoporous Semiconductor Oxide Films written by Renata Solarska and published by . This book was released on 2006 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le présent travail étudie les propriétés d'électrodes semi-conductrices en bioxyde de titane et trioxyde de tungstène permettant la photo-électrolyse de l'eau et/ou la photo-dégradation de substances organiques. Ces électrodes constituées de nano-particules d'oxydes forment des couches mésoporeuses de quelques microns d'épaisseur.
Author : Lionel Vayssieres
Publisher : John Wiley & Sons
ISBN 13 : 0470823984
Total Pages : 706 pages
Book Rating : 4.4/5 (78 download)
Download or read book On Solar Hydrogen and Nanotechnology written by Lionel Vayssieres and published by John Wiley & Sons. This book was released on 2010-01-26 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: More energy from the sun strikes Earth in an hour than is consumed by humans in an entire year. Efficiently harnessing solar power for sustainable generation of hydrogen requires low-cost, purpose-built, functional materials combined with inexpensive large-scale manufacturing methods. These issues are comprehensively addressed in On Solar Hydrogen & Nanotechnology – an authoritative, interdisciplinary source of fundamental and applied knowledge in all areas related to solar hydrogen. Written by leading experts, the book emphasizes state-of-the-art materials and characterization techniques as well as the impact of nanotechnology on this cutting edge field. Addresses the current status and prospects of solar hydrogen, including major achievements, performance benchmarks, technological limitations, and crucial remaining challenges Covers the latest advances in fundamental understanding and development in photocatalytic reactions, semiconductor nanostructures and heterostructures, quantum confinement effects, device fabrication, modeling, simulation, and characterization techniques as they pertain to solar generation of hydrogen Assesses and establishes the present and future role of solar hydrogen in the hydrogen economy Contains numerous graphics to illustrate concepts, techniques, and research results On Solar Hydrogen & Nanotechnology is an essential reference for materials scientists, physical and inorganic chemists, electrochemists, physicists, and engineers carrying out research on solar energy, photocatalysis, or semiconducting nanomaterials, both in academia and industry. It is also an invaluable resource for graduate students and postdoctoral researchers as well as business professionals and consultants with an interest in renewable energy.
Author :
Publisher :
ISBN 13 :
Total Pages : 728 pages
Book Rating : 4.:/5 (334 download)
Download or read book Australian Official Journal of Patents written by and published by . This book was released on 2003-08-07 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jinlian Hu
Publisher : Woodhead Publishing
ISBN 13 : 0081002653
Total Pages : 486 pages
Book Rating : 4.0/5 (81 download)
Download or read book Active Coatings for Smart Textiles written by Jinlian Hu and published by Woodhead Publishing. This book was released on 2016-04-06 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Alain C. Pierre
Publisher : Springer Nature
ISBN 13 : 3030381447
Total Pages : 716 pages
Book Rating : 4.0/5 (33 download)
Download or read book Introduction to Sol-Gel Processing written by Alain C. Pierre and published by Springer Nature. This book was released on 2020-03-10 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a broad, general introduction to the processing of Sol-Gel technologies. This updated volume serves as a general handbook for researchers and students entering the field. This new edition provides updates in fields that have undergone rapid developments, such as Ceramics, Catalysis, Chromatropgraphy, biomaterials, glass science, and optics. It provides a simple, compact resource that can also be used in graduate-level materials science courses.
Author : Anouar Hajjaji
Publisher : Springer
ISBN 13 : 3319133535
Total Pages : 139 pages
Book Rating : 4.3/5 (191 download)
Download or read book Chromium Doped TiO2 Sputtered Thin Films written by Anouar Hajjaji and published by Springer. This book was released on 2014-12-24 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents co-sputtered processes ways to produce chrome doped TiO2 thin films onto various substrates such as quartz, silicon and porous silicon. Emphasis is given on the link between the experimental preparation and physical characterization in terms of Cr content. Moreover, the structural, optical and optoelectronic investigations are emphasized throughout. The book explores the potencial applications of devices based on Cr doped TiO2 thin films as gas sensors and in photocatalysis and in the photovoltaic industry. Also, this book provides extensive leads into research literature, and each chapter contains details which aim to develop awareness of the subject and the methods used. The content presented here will be useful for graduate students as well as researchers in materials science, physics, chemistry and engineering.
Author : Zumin Wang
Publisher : CRC Press
ISBN 13 : 9814463418
Total Pages : 317 pages
Book Rating : 4.8/5 (144 download)
Download or read book Metal-Induced Crystallization written by Zumin Wang and published by CRC Press. This book was released on 2015-01-28 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crystalline semiconductors in the form of thin films are crucial materials for many modern, advanced technologies in fields such as microelectronics, optoelectronics, display technology, and photovoltaic technology. Crystalline semiconductors can be produced at surprisingly low temperatures (as low as 120C) by crystallization of amorphous semicon
Author : Salvatore Scire
Publisher : Elsevier
ISBN 13 : 0128156627
Total Pages : 402 pages
Book Rating : 4.1/5 (281 download)
Download or read book Cerium Oxide (CeO2): Synthesis, Properties and Applications written by Salvatore Scire and published by Elsevier. This book was released on 2019-08-21 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cerium Oxide (CeO2): Synthesis, Properties and Applications provides an updated and comprehensive account of the research in the field of cerium oxide based materials. The book is divided into three main blocks that deal with its properties, synthesis and applications. Special attention is devoted to the growing number of applications of ceria based materials, including their usage in industrial and environmental catalysis and photocatalysis, energy production and storage, sensors, cosmetics, radioprotection, glass technology, pigments, stainless steel and toxicology. A brief historical introduction gives users background, and a final chapter addresses future perspectives and outlooks to stimulate future research. The book is intended for a wide audience, including students, academics and industrial researchers working in materials science, chemistry and physics. Addresses a wide range of applications of ceria-based materials, including catalysis, energy production and storage, sensors, cosmetics and toxicology Provides the fundamentals of ceria-based materials, including synthesis methods, materials properties, toxicology and surface chemistry Includes nanostructured ceria-based materials and a discussion of future prospects and outlooks
Author : S V Krivovichev
Publisher : Springer Science & Business Media
ISBN 13 : 3642200184
Total Pages : 424 pages
Book Rating : 4.6/5 (422 download)
Download or read book Minerals as Advanced Materials II written by S V Krivovichev and published by Springer Science & Business Media. This book was released on 2011-12-01 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of papers that are devoted to various aspects of interactions between mineralogy and material sciences. It will include reviews, perspective papers and original research papers on mineral nanostructures, biomineralization, micro- and nanoporous mineral phases as functional materials, physical and optical properties of minerals, etc. Many important materials that dominate modern technological development were known to mineralogists for hundreds of years, though their properties were not fully recognized. Mineralogy, on the other hand, needs new impacts for the further development in the line of modern scientific achievements such as bio- and nanotechnologies as well as by the understanding of a deep role that information plays in the formation of natural structures and definition of natural processes. It is the idea of this series of books to provide an arena for interdisciplinary discussion on minerals as advanced materials.
Author : Markus Niederberger
Publisher : Springer Science & Business Media
ISBN 13 : 1848826710
Total Pages : 223 pages
Book Rating : 4.8/5 (488 download)
Download or read book Metal Oxide Nanoparticles in Organic Solvents written by Markus Niederberger and published by Springer Science & Business Media. This book was released on 2009-09-17 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Oxide Nanoparticles in Organic Solvents discusses recent advances in the chemistry involved for the controlled synthesis and assembly of metal oxide nanoparticles, the characterizations required by such nanoobjects, and their size and shape depending properties. In the last few years, a valuable alternative to the well-known aqueous sol-gel processes was developed in the form of nonaqueous solution routes. Metal Oxide Nanoparticles in Organic Solvents reviews and compares surfactant- and solvent-controlled routes, as well as providing an overview of techniques for the characterization of metal oxide nanoparticles, crystallization pathways, the physical properties of metal oxide nanoparticles, their applications in diverse fields of technology, and their assembly into larger nano- and mesostructures. Researchers and postgraduates in the fields of nanomaterials and sol-gel chemistry will appreciate this book’s informative approach to chemical formation mechanisms in relation to metal oxides.
