SYNTHESES ET ETUDES STRUCTURALES DE MATERIAUX PREPARES PAR VOIE SOL-GEL PDF Download
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Author: Isabelle Gautier-Luneau
Publisher:
ISBN:
Category :
Languages : fr
Pages : 164
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Book Description
PREPARATION DU TITANATE DE BARYUM PAR HYDROLYSE ACIDE D'UNE SOLUTION D'ACETATE DE BARYUM ANHYDRE BA(CH::(3)COO)::(2) ET D'ETHANOATE DE TITANE EN MILIEU METHANOLIQUE
Author: Isabelle Gautier-Luneau
Publisher:
ISBN:
Category :
Languages : fr
Pages : 164
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Book Description
PREPARATION DU TITANATE DE BARYUM PAR HYDROLYSE ACIDE D'UNE SOLUTION D'ACETATE DE BARYUM ANHYDRE BA(CH::(3)COO)::(2) ET D'ETHANOATE DE TITANE EN MILIEU METHANOLIQUE
Author: Hassan Tayaa
Publisher:
ISBN:
Category :
Languages : fr
Pages : 203
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Book Description
LE BUT DE CE TRAVAIL EST L'ETUDE DE L'INFLUENCE DES ADDITIFS CHIMIQUES UTILISES DANS LES PROCEDES SOL-GEL (ACETYLACETONE, TRIETHANOLAMINE, DIETHANOLAMINE, DIMETHYLFORMAMIDE, ACIDE ACETIQUE...), SUR L'ORGANISATION DES XEROGELS SECHES A TEMPERATURE AMBIANTE, SUR LES TEMPERATURES DE CHANGEMENT DE PHASES LORS DU TRAITEMENT THERMIQUE DES GELS AINSI QUE SUR LA MORPHOLOGIE DES POUDRES CERAMIQUES OBTENUES. DEUX MODES DE SYNTHESE DES GELS ONT ETE UTILISES: 1) UNE VOIE SOL-GEL CLASSIQUE OU L'ETAPE D'HYDROLYSE EST SOIGNEUSEMENT CONTROLEE; 2) UN PROCEDE PLUS SIMPLE OU L'HYDROLYSE N'EST PAS CONTROLEE (HUMIDITE AMBIANTE). LA CARACTERISATION STRUCTURALE ET LA MODELISATION DE L'ORDRE LOCAL ONT PERMIS DE DISTINGUER CINQ FAMILLES DE GELS: *GELS MICROCRISTALLISES DE TYPE BAYERITE; *GELS MICROCRISTALLISES DE TYPE BOEHMITE; *GELS AMORPHES DE TYPE BOEHMITE; *GELS AMORPHES DE TYPE GIBBSITE; *GELS AMORPHES CONSTITUES DE COMPLEXES MOLECULAIRES OLIGOMERES. LE TRAITEMENT THERMIQUE DE CES GELS CONDUIT A L'OBTENTION DE L'ALUMINE ALPHA APRES PASSAGE PAR DES ALUMINES DE TRANSITION, EN PARTICULIER DES ALUMINES GAMMA. UNE ETUDE DETAILLEE DE LA SURFACE SPECIFIQUE DE CES DERNIERES A PERMIS DE METTRE EN EVIDENCE UNE TRES GRANDE VARIATION DE CETTE GRANDEUR EN FONCTION DE L'ADDITIF UTILISE; EN PARTICULIER, DE TRES FAIBLES VALEURS SONT OBTENUES POUR LES GELS PREPARES AVEC LES ACIDES CARBOXYLIQUES. LA TEMPERATURE DE CRISTALLISATION DE LA PHASE ALUMINE-ALPHA EST GENERALEMENT OBSERVEE AU-DESSUS DE 1100#OC. L'UTILISATION DES PROCEDES SOL-GEL MODIFIES PAR ADDITIF PERMET DE RAMENER CETTE TEMPERATURE A LA ZONE 880#OC-950#OC. PLUS REMARQUABLE ENCORE EST LE RESULTAT OBTENU POUR LE GEL PREPARE AVEC L'ACIDE ACETIQUE. L'OBSERVATION EN MICROSCOPIE ELECTRONIQUE A PERMIS DE CARACTERISER LA PRESENCE DE L'ALUMINE ALPHA SOUS FORME DE GROS CRISTAUX VERMICULAIRES A 700#OC
Author: John D. Wright
Publisher: CRC Press
ISBN: 1482283166
Category : Science
Languages : en
Pages : 136
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Book Description
Sol-Gel processing methods, first used historically for decorative and constructional materials, were extensively developed in the last century for applications such as glasses, ceramics, catalysts, coatings, composites and fibres. Today they are reaching their full potential, enabling the preparation of new generations of advanced materials not easily accessible by other methods yet using mild, low-energy conditions. The topic is therefore increasingly included in advanced undergraduate, MSc and PhD programmes in the areas of chemistry, physics and materials science. This concise introductory text, written at the advanced undergraduate/first-year postgraduate level, is also suitable as an introduction to the development, mechanisms, chemistry, characterisation methods and applications of the technique. It provides readers with an extensive yet concise grounding in the theory of each area of the subject and details the real and potential applications and the future prospects of sol-gel chemistry.
Author: Pascale Lacan
Publisher:
ISBN:
Category :
Languages : fr
Pages : 223
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Book Description
L'INCORPORATION DE MOLECULES ORGANIQUES DANS DES MATRICES SOLIDES A ETE MISE EN UVRE POUR DEUX APPLICATIONS: LA PREPARATION DE MEMBRANES A TRANSPORT FACILITE ET DE CAPTEURS OPTIQUE DE PH. LES MATRICES HOTES SONT DES MATERIAUX HYBRIDES (ORGANIQUES-INORGANIQUES) OU INORGANIQUES (SILICE) PREPARES PAR VOIE SOL-GEL. LA POLYCONDENSATION DU RESEAU INORGANIQUE DE SILICE A ETE SUIVIE PAR RMN #2#9SI A L'ETAT LIQUIDE ET A L'ETAT SOLIDE. LA STRUCTURE ORGANIQUE DES MATERIAUX HYBRIDES A ETE DETERMINEE PAR RMN #1#3C. UNE ETUDE RHEOLOGIQUE DE LA TRANSITION SOL-GEL A PERMIS DE MONTRER L'IMPORTANCE DE LA NATURE ET DE LA STRUCTURE DES PRECURSEURS SUR LES PROPRIETES VISCOELASTIQUES ET MECANIQUES DU MATERIAU FINAL. LE GREFFAGE CHIMIQUE D'UN AGENT COMPLEXANT (BENZO-15-COURONNE-5) POUR PREPARER DES MEMBRANES SOLIDES A TRANSPORT FACILITE, A ETE REALISE SUR UN MATERIAU HYBRIDE. LE TRANSPORT FACILITE ET SELECTIF DES IONS POTASSIUM A ETE MIS EN EVIDENCE AVEC CES MEMBRANES DONT LES VITESSES DE TRANSPORT ET LA DUREE DE VIE SONT SUPERIEURES A CELLES DES MEMBRANES LIQUIDES. LA QUANTITE DE TRANSPORTEUR GREFFE, SON ENCOMBREMENT ET LA NATURE DES CONTRE-IONS QUI ACCOMPAGNENT LES IONS POTASSIUM SONT LES PARAMETRES QUI GOUVERNENT LE TRANSPORT. UN MECANISME DE TRANSPORT EST PROPOSE. LES CAPTEURS OPTIQUES DE PH ONT ETE OBTENUS EN PIEGEANT UN INDICATEUR COLORE (FLUORESCEINE) DANS DIVERSES MATRICES, HYBRIDES OU INORGANIQUES. LEURS TEMPS DE REPONSE, REVERSIBILITE, REPRODUCTIBILITE ET DUREE DE VIE ONT ETE SYSTEMATIQUEMENT EVALUES. DANS TOUS LES CAS, LES CONDITIONS DE PREPARATION GOUVERNENT LA TEXTURE DU MATERIAU ET PAR CONSEQUENT LES PERFORMANCES DES CAPTEURS
Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 564
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Book Description
Author: Touria Jermoumi
Publisher:
ISBN:
Category :
Languages : fr
Pages : 176
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Book Description
Author: Michel Andre Aegerter
Publisher: Springer Science & Business Media
ISBN: 0387889531
Category : Technology & Engineering
Languages : en
Pages : 474
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Book Description
Sol-Gel Techniques for Glass Producers and Users provides technological information, descriptions and characterizations of prototypes, or products already on the market, and illustrates advantages and disadvantages of the sol-gel process in comparison to other methods. The first chapter entitled "Wet Chemical Technology" gives a summary of the basic principles of the sol-gel chemistry. The most promising applications are related to coatings. Chapter 2 describes the various "Wet Chemical Coating Technologies" from glass cleaning to many deposition and post-coating treatment techniques. These include patterning of coatings through direct or indirect techniques which have became very important and for which the sol-gel processing is particularly well adapted. Chapter 3 entitled "Bulk Glass Technologies" reports on the preparation of special glasses for different applications. Chapter 4 entitled "Coatings and Materials Properties" describes the properties of the different coatings and the sol-gel materials, fibers and powders. The chapter also includes a section dedicated to the characterization techniques especially applied to sol-gel coatings and products.
Author: K. Byrappa
Publisher: William Andrew
ISBN: 1437778364
Category : Science
Languages : en
Pages : 796
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Book Description
Quartz, zeolites, gemstones, perovskite type oxides, ferrite, carbon allotropes, complex coordinated compounds and many more -- all products now being produced using hydrothermal technology. Handbook of Hydrothermal Technology brings together the latest techniques in this rapidly advancing field in one exceptionally useful, long-needed volume.The handbook provides a single source for understanding how aqueous solvents or mineralizers work under temperature and pressure to dissolve and recrystallize normally insoluble materials, and decompose or recycle any waste material. The result, as the authors show in the book, is technologically the most efficient method in crystal growth, materials processing, and waste treatment. The book gives scientists and technologists an overview of the entire subject including: À Evolution of the technology from geology to widespread industrial use. À Descriptions of equipment used in the process and how it works.À Problems involved with the growth of crystals, processing of technological materials, environmental and safety issues.À Analysis of the direction of today's technology. In addition, readers get a close look at the hydrothermal synthesis of zeolites, fluorides, sulfides, tungstates, and molybdates, as well as native elements and simple oxides. Delving into the commercial production of various types, the authors clarify the effects of temperature, pressure, solvents, and various other chemical components on the hydrothermal processes. - Gives an overview of the evolution of Hydrothermal Technology from geology to widespread industrial use - Describes the equipment used in the process and how it works - Discusses problems involved with the growth of crystals, processing of technological materials, and environmental and safety issues
Author: Wonbong Choi
Publisher: CRC Press
ISBN: 1439861889
Category : Science
Languages : en
Pages : 374
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Book Description
Since the late 20th century, graphene-a one-atom-thick planar sheet of sp2-bonded carbon atoms densely packed in a honeycomb crystal lattice-has garnered appreciable attention as a potential next-generation electronic material due to its exceptional properties. These properties include high current density, ballistic transport, chemical inertness,
Author: James E Shelby
Publisher: Royal Society of Chemistry
ISBN: 1782625119
Category : Technology & Engineering
Languages : en
Pages : 320
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Book Description
This book provides a concise and inexpensive introduction for an undergraduate course in glass science and technology. The level of the book has deliberately been maintained at the introductory level to avoid confusion of the student by inclusion of more advanced material, and is unique in that its text is limited to the amount suitable for a one term course for students in materials science, ceramics or inorganic chemistry. The contents cover the fundamental topics of importance in glass science and technology, including glass formation, crystallization, phase separation and structure of glasses. Additional chapters discuss the most important properties of glasses, including discussion of physical, optical, electrical, chemical and mechanical properties. A final chapter provides an introduction to a number of methods used to form technical glasses, including glass sheet, bottles, insulation fibre, optical fibres and other common commercial products. In addition, the book contains discussion of the effects of phase separation and crystallization on the properties of glasses, which is neglected in other texts. Although intended primarily as a textbook, Introduction to Glass Science and Technology will also be invaluable to the engineer or scientist who desires more knowledge regarding the formation, properties and production of glass.
