Showing papers in "Thermochimica Acta in 1990"

TL;DR: In this article, an approach to the solution of the inverse kinetic problem in the case of complex processes is proposed based on the analysis of the dependence of activation energy calculated by the isoconversion method on the transformation degree.

TL;DR: In this paper, a Knudsen effusion apparatus for measuring vapour pressures of organic and organometallic solids as a function of temperature and the subsequent calculation of enthalpies of sublimation is described.

TL;DR: In this paper, a method for determining the real kinetics of solid-state reactions from analysis of the shape of controlled-rate thermal analysis curves is proposed, which provides an easy way for discriminating between Avrami-Erofeev and diffusion kinetic laws.

TL;DR: The thermal decomposition of dolomite, CaMg(CO 3 ) 2, has been studied by obtaining thermogravimetric and differential thermal analysis curves in various controlled atmospheres involving the use of N 2 )-CO 2 mixtures as mentioned in this paper.

TL;DR: In this paper, a tetrahedral structure has been suggested for 1-benzyl-2-phenylbenzimidazole (BPBI) complexes, which have been subjected to a systematic TG/DTG/DTA analysis.

TL;DR: In this paper, a kinetic analysis of the thermal decomposition of eucalyptus sawdust, cellulose, and cellulose kraft lignin was performed from temperature-programmed reaction experiments, using two different approaches.

TL;DR: In this article, the thermodynamics of dissolution of a set of cyclic dipeptide solids into water has been studied in order to establish the energetic contributions of various groups which determine protein folding.

TL;DR: In this paper, the authors used thermal analysis to evaluate the activity of catalysts for the oxidation of soot produced during combustion and found that in the absence of oxygen, 16% of the soot was oxidised by the oxygen of the catalyst.

TL;DR: Differential scanning calorimetry (DSC) has been applied to 273 environmental standards, including pesticides, herbicides and related compounds as discussed by the authors, including amines, organometallics, esters and heterocycles.

TL;DR: In this article, the dynamics of enthalpy-evolution in non-crystalline samples of solid butyronitrile were analyzed in terms of the equations of Kohlrausch, Williams and Watts (KWW), and of Adam and Gibbs (AG).

TL;DR: In this article, a simple method for simultaneously measuring metabolic heat rate and the rate of CO 2 production directly in the calorimetric reaction vessel is described, which requires only a slight modification of existing, commercially available, heat conduction calorimeters.

TL;DR: In this article, a procedure has been developed for the prepn. of microbial biomass of std., defined quality suitable for the detn of elemental compn. and enthalpy of combustion.

TL;DR: The thermal lattice expansion of calcined hydroxyapatite and β-tricalcium phosphate single-phase powder was investigated by high-temperature X-ray diffractometry as discussed by the authors.

TL;DR: The solution thermodynamics and phase equilibria of bismuth-copper alloys at 400-1500 K have been analyzed in this paper, where both the liquid and the copper terminal solution were treated as substitutional alloy phases.

TL;DR: In this paper, the authors review recent advances in the thermodynamics of (dilute) non-electrolyte solutions and discuss some of the problems encountered in data reduction and data correlation.

TL;DR: The temperature calibration of a Perkin-Elmer DSC7 has been performed on cooling using the isotropic to nematic or cholesteric transitions of thermally stable liquid crystals as discussed by the authors.

TL;DR: It is shown that the activation energy error caused by the wrong choice of model makes adequate transformation impossible and it is concluded that for practical purposes it is necessary to employ methods which solve the inverse kinetic problem and do not use discrimination.

TL;DR: In this article, a study of the thermal stability of α-amino acids by simultaneous TG-DSC measurements and kinetic calculations with the dynamic TG technique was carried out, and three different scales of thermal stability were found from the thermodynamic and kinetic data.

TL;DR: In this paper, the reduction behavior of silica-supported copper catalysts prepared by homogeneous deposition-precipitation has been studied by temperature-programmed reduction (TPR), differential thermogravimetry (DTG), in-situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, and evolved gas analysis (EGA).

TL;DR: In this article, the heat contents of the III-V compounds of AlN, GaN, AlP, GaP, InP, AlAs, GaAs, InAs, AlSb, GaSb and InSb were measured over the temperature range 650 to 1550K using a drop calorimeter.

TL;DR: In this article, a method has been devised to study the cure of epoxy resins using a dynamic mechanical thermal analyzer (DMTA) in combination with differential scanning calorimetry.

TL;DR: In this article, a study of the crystallization kinetics of amorphous alloys in the Cu-As-Se system was made using a method in which the crystalization rate was deduced bearing in mind the dependence of the reaction rate constant on time, through temperature.

TL;DR: In this article, the initial stages in the degradation of leucoemeraldine involved the loss of some hydrogen, resulting in the formation of imine-like structures, and the presence of these structures was confirmed by IR absorption spectroscopy and X-ray photoelectron spectrograms.

TL;DR: In this paper, a method for the ab initio evaluation of solvation and solvent transfer Gibbs energies is presented and illustrated with some results The method provides for the complete determination of Δ G , however, for many purposes a less detailed description is sufficient and the work of computation can be drastically reduced.

TL;DR: In this article, thermodynamic data concerning the aqueous solutions of mono-and oligosaccharides (including cyclosac-charides) are critically reviewed, reference also being made to other physico-chemical properties.

TL;DR: In this article, the effects of impurities on the observed kinetic parameters of calcium carbonate decomposition were studied and it was found that the activation energy for calcite containing at least 98.2% of calcite is 110.5 kJ mol−1 and for calcitic calcite with 99.5% of the calcite it is 193.8 kJmol−1.

TL;DR: Excess volume measurements for 2,5-dioxahexane + heptane and + octane were reported in this paper, as well as the reported excess enthalpy data for chain aliphatic ether+alkane systems as a function of composition.

TL;DR: In this paper, a unified mathematical approach to the analysis of DSC data is presented, which addresses the baseline correction to the DSC record as well as the solutions of the curve curves of single or multiple, physical and chemical transformations.

TL;DR: In this article, the solubilities of benzene, toluene, o-, m-, and p-xylenes, and naphthalene in water as well as in aqueous salt solutions were determined at 25° C by spectrophotometry.