Download or read book Nanocomposites Organiques Matrice de Silicium Poreux written by Diyana Badeva and published by Omniscriptum. This book was released on 2011-07 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Après une brève bibliographie, nous présentons une première partie de nos études qui consiste en l'élaboration de la matrice en silicium poreux soit de type dopé p, soit dopé n, qui doit répondre aux besoins optiques: avoir une porosité élevée, des pores dans l'échelle « mésoporeux » (20-50nm) et une épaisseur de la couche poreuse la plus importante possible. La morphologie et les caractéristiques physico-chimiques sont déterminées par différentes techniques de caractérisation. Une seconde partie traite des possibilités de modifier la nature chimique de la surface poreuse par oxydation et greffage d'organosilanes fluoré ou aminé, pour optimiser le remplissage de la couche poreuse. Enfin la dernière partie présente la réalisation des nanocomposites à matrice de silicium poreux avec le poly (terthiophène-acide acétique) et ses complexes. Nous avons mis en évidence le remplissage par une nouvelle méthode - à la fusion. Une approche des mesures optiques a été menée pour montrer les propriétés optique non linéaires de ce matériau.
Download or read book Elaboration et caract risation de nanocomposites organiques matrice de silicium poreux written by Diyana Badeva and published by . This book was released on 2010 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse est réalisé en cotutelle entre l‟IMN de Nantes (France) et UTCM de Sofia (Bulgarie) dans le cadre d‟une bourse du Gouvernement Français. Il consiste en l‟élaboration et caractérisation de nouveaux nanocomposites à base d‟une matrice de silicium poreux remplie avec des polymères qui présentent des propriétés optique non linéaires pour des applications de télécommunication, pour le traitement du signal optique en mode tout optique ultrarapide. Après une brève bibliographie, nous présentons une première partie de nos études qui consiste en l‟élaboration de la matrice en silicium poreux soit de type dopé p, soit dopé n, qui doit répondre aux besoins optiques : avoir une porosité élevée, des pores dans l‟échelle « mésoporeux » (20-50nm) et une épaisseur de la couche poreuse la plus importante possible. La morphologie et les caractéristiques physico-chimiques sont déterminées par différentes techniques de caractérisation. Une seconde partie traite des possibilités de modifier la nature chimique de la surface poreuse par oxydation et greffage d‟organosilanes fluoré ou aminé, pour optimiser le remplissage de la couche poreuse. Enfin la dernière partie présente la réalisation des nanocomposites à matrice de silicium poreux avec le poly (terthiophène-acide acétique) et ses complexes. Nous avons mis en évidence le remplissage par une nouvelle méthode - à la fusion. Une approche des mesures optiques a été menée pour montrer les propriétés optique non linéaires de ce matériau.
Download or read book laboration et caract risation de nanocomposites written by Nicolas Errien and published by . This book was released on 2004 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: La réalisation de nanocomposites à propriétés optiques non linéaires importantes à base de silicium poreux (ou silice poreuse) et de polymères conjugués est très intéressante. En effet, on peut facilement intégrer cette technologie à celle de la microélectronique. Nous présentons tout d'abord, la caractérisation de la matrice en silicium poreux ainsi que celle en silice poreuse. Nous avons déterminé les caractéristiques physico-chimiques de nos matrices ainsi que leurs morphologies. Ensuite, nous avons introduit des matériaux actifs à l'intérieur des pores. Nous avons rempli électrochimiquement le silicium poreux par le poly(3-alkylthiophène) : PT12 et nous avons réalisé un nanocomposite de silice poreuse remplie par le poly(diacétylène para toluène sulfonate) : PDA-TS. Les propriétés optiques non linéaires intéressantes de ces nanocomposites ont été mises en évidence. Nous avons aussi rempli des guides plans par ces deux méthodes, et par la même, obtenu un guide optique actif.
Download or read book TRANSFERT D EXCITATION DANS LES NANOCOMPOSITES A BASE DE SILICIUM POREUX written by SONIA.. LETANT and published by . This book was released on 1998 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL A ETE CONSACRE A L'ETUDE DU TRANSFERT D'EXCITATION DANS LES NANOCOMPOSITES A BASE DE SILICIUM POREUX. LE BUT ETAIT D'ETUDIER LE COUPLAGE DES PORTEURS PHOTOGENERES DANS LES NANOCRISTAUX DE SILICIUM AVEC LEUR ENVIRONNEMENT, LIQUIDE, SOLIDE OU GAZEUX. NOUS PRESENTONS ICI L'INVESTIGATION PAR DES METHODES DE LUMINESCENCE CONTINUE ET RESOLUE DANS LE TEMPS, DE TROIS STRUCTURES COMPOSITES : * LE SILICIUM POREUX DANS SA SOLUTION ACIDE DE FORMATION : UN PROCESSUS DE PHOTODISSOLUTION DES COUCHES POREUSES SOUS LUMIERE EST MIS EN EVIDENCE ET CARACTERISE ; DANS CE CAS, LES PORTEURS FUIENT PHYSIQUEMENT LES CRISTALLITES POUR PARTICIPER A LA REACTION PHOTOCHIMIQUE PERMETTANT LE PASSAGE DES ATOMES DE SILICIUM DANS LA SOLUTION. * LE SILICIUM POREUX IMPREGNE DE COLORANTS LASER : IL EST DEMONTRE QUE LES COUCHES POREUSES PEUVENT ETRE UTILISEES COMME MATRICE D'ACCUEIL PASSIVE (EXCITATION DIRECTE DES MOLECULES) OU ACTIVE (TRANSFERT D'EXCITATION DE LA MATRICE VERS LES MOLECULES VIA UN COUPLAGE DIPOLAIRE). * LE SILICIUM POREUX COUVERT DE LIAISONS SI-H : UNE CONVERSION DE L'ENERGIE OPTIQUE EN ENERGIE VIBRATIONNELLE VIA UN COUPLAGE DIPOLAIRE ENTRE LES PORTEURS ET LES VIBRATIONS DE SURFACE A LIEU. LE ROLE IMPORTANT DE LA SURFACE SPECIFIQUE EST ALORS MIS EN EVIDENCE MALGRE L'ORIGINE QUANTIQUE DE L'EMISSION. IL RESSORT DE CETTE ETUDE QUE LE SILICIUM POREUX, MALGRE SA FAIBLE EFFICACITE QUANTIQUE, EST UNE BONNE MATRICE D'ACCUEIL, GRACE A SA POROSITE OUVERTE ET A SA GRANDE SURFACE SPECIFIQUE, ET QU'IL POSSEDE LES PROPRIETES D'UN DONNEUR D'EXCITATION.
Download or read book Couches minces et membranes auto support es de silicium poreux written by Dorra Abidi and published by . This book was released on 2009 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: La grande surface développée du silicium poreux favorise l'incorporation de molécules organiques. Des nanocomposites hybrides à base de molécules conjuguées luminescentes pourraient se prêter à des applications en optoélectronique. L’étude comprend deux parties essentielles : la première partie est consacrée à l’étude morphologique et optique des couches minces et des membranes auto-supportées de silicium poreux fabriquées au laboratoire, en utilisant la microscopie électronique, l’ellipsométrie spectroscopique et l’absorption. L'analyse microstructurale des couches poreuses par diffusion Raman permet d’estimer la distribution de tailles des nanocristallites via le modèle de confinement des phonons et aussi de confirmer l’absence de porteurs de charges libres. Une étude par Raman polarisé sur des membranes poreuses libres est révélatrice de l’inhomogénéité de la propagation de la lumière dans ce matériau. La deuxième partie est dédiée à l'étude des nanocomposites hybrides préparés avec des colorants laser et des polymères conjugués. L’étude est réalisée par photoluminescence, photoluminescence résolue en temps et diffusion Raman.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Download or read book Jinsha site written by 成都金沙遗址博物馆 and published by 中信出版社. This book was released on 2006 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Download or read book Diffusion in Materials DIMAT 2011 written by Igor Bezverkhyy and published by Trans Tech Publications Ltd. This book was released on 2012-04-12 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools. Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.
Download or read book Basics of Paint Technology part I written by V. C. Malshe and published by Prakash C. Malshe. This book was released on 2010 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Processing and Characterization written by Sabu Thomas and published by CRC Press. This book was released on 2012-07-23 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the polymers, different methods of synthesis, and synthesis of composites, as well as the different techniques used for polymer characterization. Most of the world’s industries extract the anomalous properties of polymers to make excellent cost-effective materials. Because of this, the types of polymers, their processing, and the analysis of their various properties are very significant. Readers will gain a thorough knowledge about the processing of different types of polymers and composites made from them, as well as their various applications. Suitable for classroom use but especially important for researchers, this book addresses: Adhesion of amorphous polymers with vitrified bulk and surface glass transition Functionalized biopolymers and their applications A new synthesis of p-Cresol-Adipamide-Formaldehyde copolymer resin and its applications as an ion-changer Correlating performance of commercial viscosity modifiers for formulating shear stable industrial lubricants Synthesis of phthalonitrile polymers in ionic liquid and microwave media Studies on nanocomposite polymer electrolytes doped with Ca3(PO4)2 for lithium batteries
Download or read book A Guide To Soil Mechanics written by Malcolm D Bolton and published by Universities Press. This book was released on 2013 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers all the soil mechanics and foundation engineering topics that are commonly included in civil engineering degree courses, and provides a number of springboards into related advanced topics. Although it is intended principally to satisfy the needs of student civil engineers, this guide should also prove useful to those practicing engineers who are unaware of the powerful and elegant reconstruction of the subject which has been made possible by the recent concepts of plasticity, dilatancy and critical states.
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Download or read book Polymer Processing written by Donald G. Baird and published by John Wiley & Sons. This book was released on 2014-03-24 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental concepts coupled with practical, step-by-step guidance With its emphasis on core principles, this text equips readers with the skills and knowledge to design the many processes needed to safely and successfully manufacture thermoplastic parts. The first half of the text sets forth the general theory and concepts underlying polymer processing, such as the viscoelastic response of polymeric fluids and diffusion and mass transfer. Next, the text explores specific practical aspects of polymer processing, including mixing, extrusion dies, and post-die processing. By addressing a broad range of design issues and methods, the authors demonstrate how to solve most common processing problems. This Second Edition of the highly acclaimed Polymer Processing has been thoroughly updated to reflect current polymer processing issues and practices. New areas of coverage include: Micro-injection molding to produce objects weighing a fraction of a gram, such as miniature gears and biomedical devices New chapter dedicated to the recycling of thermoplastics and the processing of renewable polymers Life-cycle assessment, a systematic method for determining whether recycling is appropriate and which form of recycling is optimal Rheology of polymers containing fibers Chapters feature problem sets, enabling readers to assess and reinforce their knowledge as they progress through the text. There are also special design problems throughout the text that reflect real-world polymer processing issues. A companion website features numerical subroutines as well as guidance for using MATLAB®, IMSL®, and Excel to solve the sample problems from the text. By providing both underlying theory and practical step-by-step guidance, Polymer Processing is recommended for students in chemical, mechanical, materials, and polymer engineering.
Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Download or read book Handbook of Thermoplastics written by Olagoke Olabisi and published by CRC Press. This book was released on 2016-02-03 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of the bestselling Handbook of Thermoplastics incorporates recent developments and advances in thermoplastics with regard to materials development, processing, properties, and applications. With contributions from 65 internationally recognized authorities in the field, the second edition features new and updated discussions of seve
Download or read book Basics of Paint Technology Part II written by V. C. Malshe and published by Prakash C. Malshe. This book was released on 2008 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt:
