Download or read book Modulation Calorimetry written by Yaakov Kraftmakher and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: The monograph presents the various methods of the modulation and of measuring the temperature oscillations. Important applications of the modulation techniques for studying physical phenomena in solids and liquids are considered in depth (equilibrium point defects, phase transitions, superconductors, liquid crystals, biological materials, relaxation phenomena in specific heat, etc).
Download or read book Modulation Calorimetry written by Yaakov Kraftmakher and published by Springer Science & Business Media. This book was released on 2004-06-09 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The monograph presents the various methods of the modulation and of measuring the temperature oscillations. Important applications of the modulation techniques for studying physical phenomena in solids and liquids are considered in depth (equilibrium point defects, phase transitions, superconductors, liquid crystals, biological materials, relaxation phenomena in specific heat, etc).
Download or read book Modulation Calorimetry and Related Techniques written by Ia. A. Kraftmakher and published by . This book was released on 2002 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modulation Calorimetry and Related Techniques written by Yaakov Kraftmakher and published by . This book was released on 2002 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modulated Temperature Differential Scanning Calorimetry written by Mike Reading and published by Springer Science & Business Media. This book was released on 2006-02-22 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: MTDSC provides a step-change increase in the power of calorimetry to characterize virtually all polymer systems including curing systems, blends and semicrystalline polymers. It enables hidden transitions to be revealed, miscibility to be accurately assessed, and phases and interfaces in complex blends to be quantified. It also enables crystallinity in complex systems to be measured and provides new insights into melting behaviour. All of this is achieved by a simple modification of conventional DSC. In 1992 a new calorimetric technique was introduced that superimposed a small modulation on top of the conventional linear temperature program typically used in differential scanning calorimetry. This was combined with a method of data analysis that enabled the sample’s response to the linear component of the temperature program to be separated from its response to the periodic component. In this way, for the first time, a signal equivalent to that of conventional DSC was obtained simultaneously with a measure of the sample’s heat capacity from the modulation. The new information this provided sparked a revolution in scanning calorimetry by enabling new insights to be gained into almost all aspects of polymer characteristics. This book provides both a basic and advanced treatment of the theory of the technique followed by a detailed exposition of its application to reacting systems, blends and semicrystalline polymers by the leaders in all of these fields. It is an essential text for anybody interested in calorimetry or polymer characterization, especially if they have found that conventional DSC cannot help them with their problems.
Download or read book A COMPUTATIONAL STUDY ON EXTENSION OF NON CONTACT MODULATION CALORIMETRY written by Xiao Ye and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate thermophysical properties of high temperature metallic liquids are important for both industrial applications and scientific research. For the former, as predictive numerical simulations play an increasingly important role in pivotal industries, such as casting, welding and sintering, the lack of precise thermophysical properties, especially at high temperatures, hamper their further applications. On the other hand, from the stand point of basic metals physics, being able to measure calorimetric properties of liquid metallic alloys allows the calculation of their thermodynamic functions, which facilitates the study of solidification kinetics of quasicrystals. This research focuses mainly on measuring properties that governs heat and fluid flow, namely specific heat and thermal conductivity. Conventional techniques generally require test materials, whether solid or liquid, in direct contact with a fastener or a container, which limits the application of these methods at high temperatures due to elevated thermal reactivity and also intensified heat and mass transfer. To overcome these drawbacks, a non-contact modulation calorimetry has been developed in the 1990s. Specifically, a spherical sample, usually smaller than 10mm in diameter, is levitated using electromagnetic levitation (EML) in a vacuum or gas cooling atmosphere. Thermophysical properties are extracted by analyzing the temperature response on the surface of the sample induced by modulated heating input. This method has been proved relevant for the measurements of specific heat but is limited in thermal conductivity measurements for liquid samples because of the influence of forced convection. In this study, a two-dimensional axisymmetical model is developed in COMSOL Multiphysics. Using magnetohydrodynamic simulation, firstly, the relevance of the operational principles of this method based on coupled heat flow model developed by Wunderlich, et al., is examined at both reported and unknown parameter range for specific heat measurements. Secondly, systematic error of thermal conductivity measurements using empirical equations in EML based modulation calorimetry is evaluated. Lastly, the possibility of combining numerical simulations and experiments to measure thermal conductivity is explored.
Download or read book Lecture Notes on Equilibrium Point Defects and Thermophysical Properties of Metals written by Yaakov Kraftmakher and published by World Scientific. This book was released on 2000 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the significant progress in the study of point defects in metals, some important problems still do not have unambiguous solutions. One of the most practically important questions relates to equilibrium defect concentrations. There exist two opposite viewpoints: (1) defect contributions to physical properties of metals at high temperatures are small and cannot be separated from the effects of anharmonicity; the equilibrium defect concentrations at the melting points are in the range of 10(-4) to 10(-3); (2) in many cases, defect contributions to the specific heat of metals are much larger than nonlinear effects of anharmonicity and can be separated without crucial errors; the equilibrium concentrations at the melting points are of the order of 10(-3) in low-melting-point metals and 10(-2) in high-melting-point metals. This book discusses the experimental results and theoretical considerations favoring each claim. At present, the majority of the scientific community hold the first viewpoint. Regrettably, the data supporting the second viewpoint have never been displayed and discussed together, and the criticism of this viewpoint has never included a detailed analysis. Important arguments supporting this viewpoint have appeared in the last decade. It may turn out that just calorimetric determinations provide the most reliable values of equilibrium defect concentrations in metals. In this book, the main attention is paid to equilibrium point defects in metals and their relation to thermophysical properties of metals. Along with a discussion on experimental data and theoretical estimates now available, some approaches are proposed that seem to be most suitable for settling thequestion.
Download or read book Vychody Carej Michaila Feodorovi a Aleksija Michailovi a Feodora Aleksievi a written by and published by . This book was released on 1844 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials Characterization by Dynamic and Modulated Thermal Analytical Techniques written by Alan T. Riga and published by ASTM International. This book was released on 2001 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: The special technical publication has been compiled from the 15 presentations at a May 2000 Association symposium in Toronto. They cover the fundamentals of the techniques, its use in curing and chemical reactions, measuring the glass transition and melting by modulated and comparative techniques, g
Download or read book Modulated Temperature Differential Scanning Calorimetry written by Mike Reading and published by Springer Science & Business Media. This book was released on 2006-10-12 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: MTDSC provides a step-change increase in the power of calorimetry to characterize virtually all polymer systems including curing systems, blends and semicrystalline polymers. It enables hidden transitions to be revealed, miscibility to be accurately assessed, and phases and interfaces in complex blends to be quantified. It also enables crystallinity in complex systems to be measured and provides new insights into melting behaviour. All of this is achieved by a simple modification of conventional DSC. In 1992 a new calorimetric technique was introduced that superimposed a small modulation on top of the conventional linear temperature program typically used in differential scanning calorimetry. This was combined with a method of data analysis that enabled the sample’s response to the linear component of the temperature program to be separated from its response to the periodic component. In this way, for the first time, a signal equivalent to that of conventional DSC was obtained simultaneously with a measure of the sample’s heat capacity from the modulation. The new information this provided sparked a revolution in scanning calorimetry by enabling new insights to be gained into almost all aspects of polymer characteristics. This book provides both a basic and advanced treatment of the theory of the technique followed by a detailed exposition of its application to reacting systems, blends and semicrystalline polymers by the leaders in all of these fields. It is an essential text for anybody interested in calorimetry or polymer characterization, especially if they have found that conventional DSC cannot help them with their problems.
Download or read book Handbook of Thermal Analysis and Calorimetry written by Michael E. Brown and published by Elsevier. This book was released on 1998-09-07 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Thermal Analysis and Calorimetry, Volume 1: Principles and Practice describes the basic background information common to thermal analysis and calorimetry in general. Thermodynamic and kinetic principles are discussed along with the instrumentation and methodology associated with thermoanalytical and calorimetric techniques. The purpose is to collect the discussion of these general principles and minimize redundancies in the subsequent volumes that are concerned with the applications of these principles and methods. More unique methods, which pertain to specific processes or materials, are covered in later volumes.
Download or read book Compendium of Thermophysical Property Measurement Methods written by A. Cezairliyan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the extensive coverage of the first volume, Volume 2 focuses on the fundamentals of measurements and computational techniques that will aid researchers in the construction and use of measurement devices.
Download or read book Theory of Calorimetry written by W. Zielenkiewicz and published by Springer Science & Business Media. This book was released on 2006-01-02 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Calorimetry is one of the oldest areas of physical chemistry. The date on which calorimetry came into being may be taken as 13 June 1783, the day on which Lavoisier and Laplace presented a contribution entitled ,,Memoire de la Chaleur“ at a session of the Academie Française. Throughout the existence of calorimetry, many new methods have been developed and the measuring techniques have been improved. At p- sent, numerous laboratories worldwide continue to focus attention on the development and applications of calorimetry, and a number of com- nies specialize in the production of calorimeters. The calorimeter is an instrument that allows heat effects in it to be determined by directly measurement of temperature. Accordingly, to determine a heat effect, it is necessary to establish the relationship - tween the heat effect generated and the quantity measured in the ca- rimeter. It is this relationship that unambiguously determines the mathematical model of the calorimeter. Depending on the type of ca- rimeter applied, the accuracy required, and the conditions of heat and mass transfer that prevail in the device, the relationship between the measured and generated quantities can assume different mathematical forms.
Download or read book Chemical Thermodynamics of Materials written by Svein Stølen and published by John Wiley & Sons. This book was released on 2004-06-25 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive introduction, examining both macroscopic and microscopic aspects of the subject, the book applies the theory of thermodynamics to a broad range of materials; from metals, ceramics and other inorganic materials to geological materials. Focusing on materials rather than the underlying mathematical concepts of the subject, this book will be ideal for the non-specialist requiring an introduction to the energetics and stability of materials. Macroscopic thermodynamic properties are linked to the underlying miscroscopic nature of the materials and trends in important properties are discussed. A unique approach covering both macroscopic and microscopic aspects of the subject Authors have worldwide reputations in this area Fills a gap in the market by featuring a wide range of real up-to-date examples and covering a large amount of materials
Download or read book Handbook of Thermal Analysis and Calorimetry written by Stephen Z.D. Cheng and published by Elsevier. This book was released on 2002-12-09 with total page 859 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a new and exciting field of interdisciplinary macromolecular science and engineering, polymeric materials will have a profound presence in 21st century chemical, pharmaceutical, biomedical, manufacturing, infrastructure, electronic, optical and information technologies. The origin of this field derived from an area of polymer science and engineering encompassing plastic technologies. The field is rapidly expanding to incorporate new interdisciplinary research areas such as biomaterials, macromolecular biology, novel macromolecular structures, environmental macromolecular science and engineering, innovative and nano-fabrications of products, and is translating discoveries into technologies. · Unique in combining scientific concepts with technological aspects · Provides a comprehensive and broad coverage of thermodynamic and thermal behaviours of various polymeric materials as well as methodologies of thermal analysis and calorimetry · Contributions are from both pioneering scientists and the new generation of researchers
Download or read book Thermal Conductivity 30 written by Daniela S. Gaal and published by DEStech Publications, Inc. This book was released on 2010 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics in Geometrical Confinement written by Friedrich Kremer and published by Springer. This book was released on 2014-06-03 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the dynamics of low molecular weight and polymeric molecules when they are constrained under conditions of geometrical confinement. It covers geometrical confinement in different dimensionalities: (i) in nanometer thin layers or self supporting films (1-dimensional confinement) (ii) in pores or tubes with nanometric diameters (2-dimensional confinement) (iii) as micelles embedded in matrices (3-dimensional) or as nanodroplets. The dynamics under such conditions have been a much discussed and central topic in the focus of intense worldwide research activities within the last two decades. The present book discusses how the resulting molecular mobility is influenced by the subtle counterbalance between surface effects (typically slowing down molecular dynamics through attractive guest/host interactions) and confinement effects (typically increasing the mobility). It also explains how these influences can be modified and tuned, e.g. through appropriate surface coatings, film thicknesses or pore diameters. "Dynamics in Confinement" sums up the present state-of-the-art and introduces to the analytical methods of choice for the study of dynamics in nanometer-scale confinement.
