Download or read book M canismes de gonflement et de dissolution des fibres de cellulose written by Nicolas Le Moigne and published by . This book was released on 2008 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le but de ces travaux était d'étudier les mécanismes de gonflement et de dissolution des fibres de cellulose en faisant varier la qualité du solvant (N-methylmorpholine-N-oxide avec différentes quantités d'eau et solutions aqueuses de NaOH à 8%), les conditions de dissolution, comme la tension, et l'origine des fibres (coton, bois, fibres régénérées ou dérivées). Les mécanismes de gonflement et de dissolution ont été étudiés par des observations microscopiques à haute résolution. Une séparation sélective des fractions solubles et insolubles a été réalisée par centrifugation. La distribution de masse molaire, la cristallinité, la composition en sucre, l'allomorphie et la quantité de chaque fraction ont été analysées. A partir de ces résultats, nous avons pu mieux décrire les mécanismes de gonflement et de dissolution des fibres de cellulose et ainsi identifier les principaux paramètres gouvernant la dissolution. Nos résultats montrent que les caractéristiques structurales et moléculaires des fibres de cellulose ainsi que les paramètres de procédés doivent être mieux contrôlés afin d'améliorer la dissolution. (i) Les paramètres de procédés concernent la convection du solvant et la possibilité de mouvements des fibres dans le solvant, (ii) les paramètres structuraux concernent la suppression des parois externes, la déstructuration des parois internes et la suppression sélectives des hémicelluloses, (iii) les paramètres moléculaires concernent la thermodynamique, comme la longueur des chaînes, la cristallinité mais aussi l'amélioration de la mobilité conformationelle des chaînes.
Download or read book The European Polysaccharide Network of Excellence EPNOE written by Patrick Navard and published by Springer Science & Business Media. This book was released on 2012-12-13 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an essential overview of the science of polysaccharides. It both approaches polysaccharides as a polymer class and provides detailed descriptions of most major polysaccharides (cellulose, mannan, xylan, chitin-chitosan, cyclodextrines). Owing to the multidisciplinary character of the European Polysaccharide Network of Excellence (EPNOE), the book describes all main aspects of polysaccharide science and technology (biology, enzymology, physics, chemistry, materials science and processing). Notations and concepts follow a uniform format throughout the whole work in order to create a valuable reference book on the field of polysaccharide science. Owing to the major importance of industry in the EPNOE, concrete applications are also described in detail.
Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Download or read book Surfaces and Interfaces in Natural Fibre Reinforced Composites written by Nicolas Le Moigne and published by Springer. This book was released on 2018-02-06 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is addressed to Master and PhD students as well as researchers from academia and industry. It aims to provide the key definitions to understand the issues related to interface modifications in natural fibre based composites considering the particular supramolecular and micro- structures encountered in plant fibres. A particular emphasis is given to the modification and functionalization strategies of natural fibres and their impact on biocomposites behaviour and properties. Commonly used and newly developed treatment processes are described in view of scaling-up natural fibre treatments for their implementation in industry. Finally, a detailed and comprehensive description of the tools and methodologies developed to investigate and characterize surfaces and interfaces in natural fibre based composites is reviewed and discussed.
Download or read book Surface and Interface Chemistry of Clay Minerals written by Robert Schoonheydt and published by Elsevier. This book was released on 2018-11-05 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface and Interface Chemistry of Clay Minerals, Volume 9, delivers a fundamental understanding of the surface and interface chemistry of clay minerals, thus serving as a valuable resource for researchers active in the fields of materials chemistry and sustainable chemistry. Clay minerals, with surfaces ranging from hydrophilic, to hydrophobic, are widely studied and used as adsorbents. Adsorption can occur at the edges and surfaces of clay mineral layers and particles, and in the interlayer region. This diversity in properties and the possibility to tune the surface properties of clay minerals to match the properties of adsorbed molecules is the basis for study. This book requires a fundamental understanding of the surface and interface chemistry of clay minerals, and of the interaction between adsorbate and adsorbent. It is an essential resource for clay scientists, geologists, chemists, physicists, material scientists, researchers, and students. - Presents scientists and engineers with a resource they can rely on for their own research and work involving clay minerals - Includes an in-depth look at ion exchange, adsorption of inorganic and organic molecules, including polymers and proteins, and catalysis occurring at the surfaces of clay minerals - Includes materials chemistry of clay minerals with chiral clay minerals, optical materials and functional films
Download or read book Cellulose written by Matheus Poletto and published by BoD – Books on Demand. This book was released on 2015-12-09 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cellulose - Fundamental Aspects and Current Trends consists of 10 chapters written by international subject matter experts investigating the characteristics and current applications of this fascinating material. This book will help the reader to develop a deeper understanding about the concepts related to cellulose and the nanocellulose structure, modification, production, dissolution, and application. Biosynthesis mechanisms and medical applications of microbial cellulose are also discussed. This book will serve as the starting point for materials science researchers, engineers, and technologists from diverse backgrounds in physics, chemistry, biology, materials science, and engineering who want to know and better understand the unique characteristics of the most abundant biopolymer on earth.
Download or read book Memoirs of the Scientific Sections of the Academy of the Socialist Republic of Romania written by and published by . This book was released on 1997 with total page 1178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multiphysical Testing of Soils and Shales written by Lyesse Laloui and published by Springer Science & Business Media. This book was released on 2012-08-22 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant advancements in the experimental analysis of soils and shales have been achieved during the last few decades. Outstanding progress in the field has led to the theoretical development of geomechanical theories and important engineering applications. This book provides the reader with an overview of recent advances in a variety of advanced experimental techniques and results for the analysis of the behaviour of geomaterials under multiphysical testing conditions. Modern trends in experimental geomechanics for soils and shales are discussed, including testing materials in variably saturated conditions, non-isothermal experiments, micro-scale investigations and image analysis techniques. Six theme papers from leading researchers in experimental geomechanics are also included. This book is intended for postgraduate students, researchers and practitioners in fields where multiphysical testing of soils and shales plays a fundamental role, such as unsaturated soil and rock mechanics, petroleum engineering, nuclear waste storage engineering, unconventional energy resources and CO2 geological sequestration.
Download or read book Principles and Practice of Variable Pressure Environmental Scanning Electron Microscopy VP ESEM written by Debbie Stokes and published by John Wiley & Sons. This book was released on 2008-12-22 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers a simple starting point to VPSEM, especially for new users, technicians and students containing clear, concise explanations Crucially, the principles and applications outlined in this book are completely generic: i.e. applicable to all types of VPSEM, irrespective of manufacturer. Information presented will enable reader to turn principles into practice Published in association with the Royal Microscopical Society (RMS) -www.rms.org.uk
Download or read book Cellulose Sources and Exploitation written by John F. Kennedy and published by Prentice Hall. This book was released on 1990 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Chorleywood Bread Process written by Stanley P. Cauvain and published by Woodhead Publishing. This book was released on 2006-03-24 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: The introduction of the Chorleywood Bread Process was a watershed in baking. It sparked changes in improver and ingredient technology, process and equipment design which have had a profound impact on baking processes and the structure of the industry. Written by two of the world's leading experts on the process, this important book explains its underlying principles and ways of maximising its potential in producing a wide range of baked products.After a brief review of the basic principles of bread making, the book outlines the development and fundamental characteristics of the Chorleywood Bread Process. The following group of chapters review the key steps in the process, beginning with ingredient quality and quantities. Other chapters consider dough mixing and processing. Building on this foundation, the authors then review common quality defects and how they can be prevented or resolved. The book then considers how knowledge-based software systems can help to manage the process. The concluding chapters review the range of bakery products that can be produced using the process, how it can best be applied in different kinds of bakery and likely future developments.The Chorleywood Bread Process is a standard work for all bakers around the world wishing to maximise the potential of the process, and for scientists, technologists and students wanting a better understanding of the process and its place in commercial bread making. - The first book to describe the Chorleywood Bread Process - Reviews ingredient quality and quantities - Considers how knowledge-based software systems can help manage the process
Download or read book Materials Science of Polymers for Engineers written by Tim A. Osswald and published by Hanser Gardner Publications. This book was released on 2003 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unified approach to polymer materials science is divided in three major sections:
Download or read book Emulsion Science written by Jerôme Bibette and published by Springer. This book was released on 2003-07-01 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emulsions occur either as end products or during the processing of products in a huge range of areas including the food, agrochemical, pharmaceuticals, paints and oil industries. As end products, emulsions allow to avoid organic solvent in processing hydrophobic coatings. Emulsion technology is a suitable approach to vehicle viscous phases. It is also a remarkable mean of targeting actives or capturing specific species. The range of applications of emulsions progresses and their manufacturing becomes more and more sophisticated. Besides this broad domain of technological interest, emulsions are raising a variety of fundamental questions at the frontier between physic and chem istry. Indeed, as a class of soft colloidal materials, emulsions science is linked to various aspects of these disciplines: phase transitions, surface forces and wetting, metastability and hydrodynamic instabilities, mechanical properties and flow. The aim of this book is to review the main important concepts governing emulsion science. In Chapter 2, repulsive interactions between liquid films are discussed as well as adhesive interaction related to wetting. In Chap ter 3, consequences of weak and strong attractions are presented, related to the well accepted liquid solid transition analogy. In Chapter 4, the basics of both bulk compressibility and shear elasticity are presented, the role of disorder being the most important aspect of the elastic behavior of these soft systems. In Chapter 5 the central question of the emulsion lifetime related to metastability is discussed.
Download or read book Physical Properties of Polymers written by James E. Mark and published by . This book was released on 1993 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contents have been divided into sections on physical states of polymers and characterization techniques. Chapters on physical states include discussions of the rubber elastic state, the glassy state, melts and concentrated solutions, the crystalline state, and the mesomorphic state. Characterization techniques described are molecular spectroscopy and scattering techniques.
Download or read book Dictionnaire des termes de m decine written by Henry Eugène de Méric and published by . This book was released on 1899 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Epoxy Polymers written by Jean-Pierre Pascault and published by John Wiley & Sons. This book was released on 2009-12-09 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the only book to focus on new developments and innovations in this hot field international experts from industry and academia present everything scientists need to know. The first section provides general concepts of the synthesis and properties of epoxy polymers and serves as a basis for the subsequent chapters. The second section includes new types of epoxy polymers recently commercialized or not yet present on the market, while the third section includes chapters related to the capacity of generating controlled nanostructures in epoxy-based materials. A fourth section is devoted to innovations in epoxy-based materials such as adhesives, coatings, pre-pregs, structural foams, injection-molded products and self-healing epoxies. Concluding remarks and perspectives are discussed in a short final section. The result is a one-stop reference source, collecting scientific and technological breakthroughs otherwise spread over hundreds of publications, patents and reports.
Download or read book Cellulose Solvents For Analysis Shaping and Chemical Modification written by Tim Liebert and published by OUP USA. This book was released on 2010-09-23 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will give an overview of the current state-of-the-art concerning the activation and dissolution of cellulose in a broad variety of solvents. Research on this topic can lead to new pathways for the utilization of the most abundant terrestrial biomolecule and may therefore be the basis for new green strategies towards advanced materials.
