Results 261 to 270 of about 11,032,615 (302)

A Comparison of DTA Evaluating Methods of DTA Experiments with Tertiary Butylperpivalate as a Testing Substance

1980
To compare several methods, used to evaluate DTA experiments, the peroxide tertiary butylperpivalate was degraded. Non-isothermal conditions were applied and kinetic constants were evaluated. The results show that the methods of Borchardt-Daniels and Coats-Redfern turned out to be most appropriate.
R. B. Barendregt, J. Verhoeff, P. J. Van den Berg   +2 more
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Oxidation stability of crosslinked polyethylene. Isothermal DTA method

Journal of Thermal Analysis, 1989
Isothermal differential thermal analysis has been used to study the thermooxidative stability of two grades of crosslinked polyethylene in the temperature range from 120°C to 230°C. Induction times of thermooxidative degradation were measured from 2 minutes up to 3590 hours.
E. Kramer, J. Koppelmann, J. Dobrowsky
openaire   +1 more source

Investigation about methods of quantitative evaluation of DTA curves

Journal of Thermal Analysis, 1977
The investigation gives a comparison of the best-known kinetic evaluation methods for DTA curves. With regard to accuracy and error-compensation, the methods of Borchardt and Daniels, Coats and Redfern and Satava and Skvara in particular are to be recommended if simple irreversible reactions are to be evaluated on the basis of homogeneous kinetics. The
H. Anderson, W. Besch, D. Haberland
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Selection of ammonia oxidation catalysts by a modified DTA method

Journal of Thermal Analysis, 1980
The paper presents a technique of examining catalysts by a modified DTA method in mixtures of reacting gases. The possibilities of using the obtained results for a selection of ammonia oxidation catalysts have been examined. The technique described may also be applied for the selection of catalysts in other reactions.
J. Barcicki, A. Wojnowski
openaire   +1 more source

Verification of an analytical method for measuring crystal nucleation rates in glasses from DTA data

Journal of Non-Crystalline Solids, 2004
A recently proposed analytical (DTA) method for estimating the nucleation rates in glasses has been evaluated by comparing experimental data with numerically computed nucleation rates for a model lithium disilicate glass.
K F Kelton
exaly   +2 more sources

DTA as a method of studying chemical reactions at high pressures

Thermochimica Acta, 1987
Abstract It is proposed that DTA should be used to study chemical reactions under high pressures “in situ”. Two techniques are described which allow the investigation of systems including substances of high chemical activity in different pressure ranges.
V.V. Avdeev, V.Z. Mordkovich
openaire   +1 more source

Crystallization Measurements Using DTA Methods: Applications to Zerodur®

Journal of the American Ceramic Society, 2003
Differential thermal analysis (DTA) experiments described herein apply two methodologies by which to estimate absolute nucleation rates and/or temperature dependencies using a low‐expansion, commercially relevant, multicomponent glass‐ceramic as a test material. In particular, the Marotta and the Ray
Mark J. Davis, Ina Mitra
openaire   +1 more source

Methods Combined with DTA

1974
Many crystalline substances show at distinct temperatures spontaneous, reversible structural transformations, the existence and temperatures of which can be observed very clearly in a DTA curve. However, the nature of the resulting products of reaction remains obscure, since these transformations receded during cooling.
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Studying salt systems with “wedged - out” compounds by DTA method

Thermochimica Acta, 1985
Abstract A wide application of differential-thermal analysis in studying heterogeneous equilibriums in polycomponent systems made it possible to single out a number of diagrams of state, which reveal lack of the phase of the similarly melting compound in b completely crystallized alloy. It led to the conclusion that traditional means of triangulation
A.S. Kosmynin, I.K. Garkushin, G.E. Shter, A.I. Sechnoy, A.S. Trunin   +4 more
openaire   +1 more source

DRIFTS/pyrometer-DTA—a novel simultaneous method in heterogeneous catalysis

Measurement Science and Technology, 2005
This work presents a novel simultaneous method: by coupling a pyrometer—a contactless temperature sensor—to an existing DRIFTS setup such a combination was applied for the first time. During temperature-programmed reduction of silver carbonate with ethylene (as an example), pyrometrically detected processes could be assigned to spectroscopically ...
A Griebel, A Zipp, S Philipp, A Drochner, H Vogel   +4 more
openaire   +1 more source