Results 251 to 260 of about 42,763 (313)
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“Quasi-isothermal” thermogravimetry
Analytica Chimica Acta, 1971A new method has been worked out which allows the implementation of a special heating program according to which the temperature of the sample is rapidly increased so long as no changes occur in it, while it ensures nearly isothermal conditions when reactions connected with weight change are taking place.
F. Paulik, J. Paulik
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2016
Thermogravimetry is the study of the relationship between a sample's mass and its temperature. Thus it is possible to study physical or chemical processes that cause a material to lose volatile gases. These include sublimation, evaporation, and thermal degradation.
Vicky L. Kett, Duncan M. Price
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Thermogravimetry is the study of the relationship between a sample's mass and its temperature. Thus it is possible to study physical or chemical processes that cause a material to lose volatile gases. These include sublimation, evaporation, and thermal degradation.
Vicky L. Kett, Duncan M. Price
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Journal of Thermal Analysis and Calorimetry, 2000
The well-known divergence between the present ‘state of the art’ of thermogravimetry and industrial requirements is discussed. Sources of errors are analyzed and the optimization of measuring conditions is discussed regarding the problems associated with static and dynamic (flow) atmospheres, and interactions between materials and gases or vapors ...
J. Czarnecki, J. Šesták
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The well-known divergence between the present ‘state of the art’ of thermogravimetry and industrial requirements is discussed. Sources of errors are analyzed and the optimization of measuring conditions is discussed regarding the problems associated with static and dynamic (flow) atmospheres, and interactions between materials and gases or vapors ...
J. Czarnecki, J. Šesták
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Micromechanical thermogravimetry
Chemical Physics Letters, 1998We demonstrate a new method for thermal analysis of nanogram quantities of material using a micromechanical thermogravimetric technique. The cantilever-type device uses an integrated piezoresistor to sense bending and simultaneously to ramp the temperature and control temperature cycles. It has a mass resolution in the picogram range.
Berger, R. +7 more
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High resolution thermogravimetry
Journal of Thermal Analysis, 1992A new thermogravimetric instrument is introduced, Hi-ResTM TGA 2950. The Hi-ResTM TQA gives a significant improvement to TG results. The instrument control parameters are varied as a function of the sample's rate of weight change. This novel feature improves resolution and reduces analysis time.
P. S. Gill +2 more
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Journal of Thermal Analysis and Calorimetry, 2015
Sources of inaccuracies in thermogravimetry and the ways of minimizing them are described. The disturbances related to buoyancy forces and disturbances caused by drag forces from local gas circulations have been studied and interpreted. Procedures leading to parts-per-million precision have been tested and proven. Recommendations for handling corrosive
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Sources of inaccuracies in thermogravimetry and the ways of minimizing them are described. The disturbances related to buoyancy forces and disturbances caused by drag forces from local gas circulations have been studied and interpreted. Procedures leading to parts-per-million precision have been tested and proven. Recommendations for handling corrosive
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The kinetics of thermogravimetry
European Polymer Journal, 1970Abstract Homogeneous degradation reactions are discussed with reference to thermogravimetric equations. The dimensional inadequacy of most of the previously-used equations is pointed out and rectified. The modified weight integral of the integrated rate equation is calculated for various reaction orders.
J.R. MacCallum, J. Tanner
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Reference materials for thermogravimetry
Journal of Thermal Analysis, 1981The thermobalances available commercially have a wide range of heater-sample-temperature sensor relationships. Because of the differences, relating data from one apparatus to another has been imprecise. The International Confederation for Thermal Analysis has certified a set of magnetic reference materials for thermogravimetry.
Paul D. Garn, O. Menis, H. G. Wiedemann
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Rate Equations in Thermogravimetry
Nature, 1970MacCallum and Tanner1 have argued persuasively for modifying the rate equations used in thermogravimetry, but their conclusions are incorrect. There is no fundamental error of the kind they suggest in the usually accepted procedures and some other reason must be found for discrepancies in derived kinetic parameters.
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Thermal standards in thermogravimetry
Talanta, 1967Comparisons of thermogravimetric data from different instruments have often led to controversy because of lack of appreciation that the values are influenced by the apparatus used. Consequently, it is suggested that various compounds be employed as thermal standards for comparing data from different sources. The paper also discusses the variables to be
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