Journal of Thermal Analysis
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Determination de la purete des substances chimiques par analyse calorimetrique differentielle (A. C. D.)
Journal of Thermal Analysis - Tập 29 - Trang 807-813 - 1984
Purity determination by DSC is possible if the impurity concentration lies within the limits 0.01 to 20 mole%. The thermodynamic equation of Schröder-Van Laar was used. This equation takes into account the effect of the departure of solutions from ideality, and the difference between the heat capacities in the solid and molten states. Eine Reinheitbestimmung mittels DSC ist möglich, wenn die Konze......
Application of Thermal Analysis to Material Science Case-Study on Hardmetals
Journal of Thermal Analysis - Tập 56 Số 2 - Trang 455-465 - 1999
Thermoanalytical methods are used for investigation of outgassing and sintering of hardmetals. Shrinkage (DILA), mass loss (TG), gas evolution (EGA - mass spectrometry) and thermal effects (DSC) allow to describe sintering processes. The results may be applied for a better understanding of technological procedures, e.g. for improvements of temperature-time-atmosphere cycles in the production scale......
Thermal decomposition kinetics of tetraalkylammonium and dimethylpyridinium salts of the complex anion bis(1,3-dithiole-2-thione-4,5-dithiolate) bismuthate (−1)
Journal of Thermal Analysis - Tập 107 - Trang 345-354 - 2011
In the present work, thermal decomposition kinetics of tetraalkylammonium and 1,4-dimethylpyridinium salts of the complex anion bis(1,3-dithiole-2-thione-4,5-dithiolate) bismuthate ([Bi(dmit)2]−) are addressed. Kinetic parameters for the decomposition reactions were obtained utilizing the Ozawa and Coats–Redfern (CR) models. Entropy, enthalpy, and free energy of decomposition processes were calcul......
A new approach to determine soil microbial biomass by calorimetry
Journal of Thermal Analysis - Tập 104 - Trang 23-29 - 2010
A method to determine soil microbial biomass (SMB) by isothermal calorimetry is reported. Soil samples ranging in pH from 6.2 to 9.4 and different textures were used to develop the method. Soil at 60% of its field capacity humidity was amended with a previously determined amount of glucose as to give the maximal response of CO2 evolution. Then, an aliquot was weighed in the calorimeter ampoule and......
Vapor Pressure Determination by Pressure DSC
Journal of Thermal Analysis - - 1998
A new pressure DSC module (Mettler DSC27HP) and its abilities for vapor pressure determination in the range of subambient pressure to 7 MPa are presented. To compare the new to an established method, vapor pressures of caffeine, naphthalene and o-phenacetin have been determined both by pressure DSC and the Knudsen effusion cell method. These results, including the derived heats of evaporation and ......
Thermodynamics of mixed-ligand complex formation of copper(II) ethylenediaminetetraacetate with amino acids in solution
Journal of Thermal Analysis - - 2013
Kinetics of evolution of individual gases in the course of shale thermal decomposition
Journal of Thermal Analysis - Tập 31 - Trang 581-587 - 1986
The results are presented of an experimental investigation of the kinetics of evolution of C
n
H
m
, CH4, CO and H2 in the course of shale thermal decomposition. The experiments were carried out with a complex experimental set-up consisting of a derivatograph, a chromatograph and a spectrophotometer, with shale samples of differen......
Non-isothermal crystallization kinetics of hot drawn polyester films
Journal of Thermal Analysis - Tập 46 - Trang 377-385 - 1996
The non-isothermal crystallization kinetics of hot drawn poly(ethylene terephthalate) films were studied using the Kissinger and Ozawa equations. The influence of the initial drawing on the crystallization kinetics was investigated. The values of the apparent activation energy and of the Avrami exponent indicates that the nucleation and growth of crystallites depend greatly on the stress submitted......
7th Brazilian Congress on Thermal Analysis and Calorimetry CBRATEC7
Journal of Thermal Analysis - Tập 106 - Trang 315-316 - 2011
Tổng số: 9,052
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