Results 291 to 300 of about 40,582 (335)

Structural characterisation and dynamics of a paramagnetic {Cr₁₂Ni₃} seahorse in non-crystalline phases.

Phys Chem Chem Phys
Geue N, Hicks E, Lockyer SJ, Nawaz S, Churchill O, Whitehead GFS, Timco GA, Burton NA, Barran PE, Winpenny REP.   +9 more
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The kinetics of thermogravimetry

European Polymer Journal, 1970
Abstract 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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Practical Thermogravimetry

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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“Quasi-isothermal” thermogravimetry

Analytica Chimica Acta, 1971
A 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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Precision thermogravimetry

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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Reference materials for thermogravimetry

Journal of Thermal Analysis, 1981
The 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.
H. G. Wiedemann, Paul D. Garn, Oscar Menis   +2 more
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Rate Equations in Thermogravimetry

Nature, 1970
MacCallum 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, 1967
Comparisons 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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