Thermochimica Acta Research Articles

06/02190 Boron nitride: a high potential support for combustion catalysts: Postole, G. et al. Thermochimica Acta, 2005, 434, (1–2), 150–157.

06/02190 Boron nitride: a high potential support for combustion catalysts: Postole, G. et al. Thermochimica Acta, 2005, 434, (1–2), 150–157.

06/02106 An examination of microwave heating to enhance diesel soot combustion: An, H. et al. Thermochimica Acta, 2005, 435, (1), 57–63.

06/02106 An examination of microwave heating to enhance diesel soot combustion: An, H. et al. Thermochimica Acta, 2005, 435, (1), 57–63.

06/01605 Heat capacity and thermodynamic functions of fullerene-containing derivatives of atactic poly(methyl methacrylate): Smirnova, N. N. et al. Thermochimica Acta, 2005, 433, (1–2), 121–127

06/01605 Heat capacity and thermodynamic functions of fullerene-containing derivatives of atactic poly(methyl methacrylate): Smirnova, N. N. et al. Thermochimica Acta, 2005, 433, (1–2), 121–127

05/00037 Development of a new oxidation stability test method for lubricating oils using high-pressure differential scanning calorimetry: Sharma, B. K. and Stipanovic, A. J. Thermochimica Acta, 2003, 402, (12), 1–18

05/00037 Development of a new oxidation stability test method for lubricating oils using high-pressure differential scanning calorimetry: Sharma, B. K. and Stipanovic, A. J. Thermochimica Acta, 2003, 402, (12), 1–18

Preface

Preface

04/01608 Errors and correction in complex heat capacity measurements by temperature modulated DSC: Kanari, K. and Ozawa, T. Thermochimica Acta, 2003, 399, (1–2), 189–201

04/01608 Errors and correction in complex heat capacity measurements by temperature modulated DSC: Kanari, K. and Ozawa, T. Thermochimica Acta, 2003, 399, (1–2), 189–201

04/01509 DTA study of preheated kaolinite in the mullite formation region: Chakraborty, A. K. Thermochimica Acta, 2003, 398, (1–2), 203–209

04/01509 DTA study of preheated kaolinite in the mullite formation region: Chakraborty, A. K. Thermochimica Acta, 2003, 398, (1–2), 203–209

A NEW DIMENSION TO STUDIES OF SPONTANEOUS COMBUSTION OF COAL

Spontaneous combustion of coal is a hazard frequently encountered in coal mining. It has been researched extensively but the actual mechanism by which it occurs is not completely understood. Under suitable conditions, the spontaneous combustion hazard manifests itself in all major aspects of coal mining, namely, underground coal mining, surface mining, stockpiling of coal at the pithead, power stations and ports, during sea-borne transport and stacking of reject material. In underground coal mining, the most difficult situation occurs when spontaneous combustion takes place in the presence of an inherently explosive atmosphere which may promote a local spontaneous combustion incident into an explosion hazard involving the entire mine. Such an incident at the Moura mine in Central Queensland resulted in greater pressure on mine operators for the safe management of spontaneous combustion in their underground coal mines than ever before. As not all coal mines are equally liable to spontaneous combustion due to the different propensities of different coals to self-oxidation, the risk assessment for spontaneous combustion is a primary requirement for the development of a spontaneous combustion management plan for a mine. Once the coal seam has been classified into various categories of spontaneous combustion risk, it is necessary to determine a fire ladder for the coal seam. This should be followed by detailed planning of the mine layout including the mine ventilation system and a spontaneous combustion monitoring program before devising a spontaneous combustion management plan as required by the Coal Mines Underground Regulations 1999. In this paper, a case history is presented which includes the development of a spontaneous combustion management plan for a high-risk coal seam in a greenfield site, from the risk assessment stage to the outbreak stage of a spontaneous combustion incident. It is concluded that the risk assessment, evaluation of the fire ladder, comprehensive monitoring by a tube bundle system and trending of carbon monoxide/oxygen deficiency ratio (Graham's ratio) and CO levels were the main elements in an effective spontaneous combustion control system for the mine.

Critical assessment of heat capacity data in G.G. Gospodinov et al. articles

Heat capacity data for some mixed oxides obtained by DSC and published in Thermochimica Acta are critically revised.

On the paper “an integral method of non-isothermal kinetic analysis” by R.E. Lyon, which appeared in Thermochimica Acta 297 (1997) 117

On the paper “an integral method of non-isothermal kinetic analysis” by R.E. Lyon, which appeared in Thermochimica Acta 297 (1997) 117

Tying up loose ends

Abstract This, the 300th edition of Thermochimica Acta coincides neatly with the retirement of the author. It is an opportune moment to look back at research which has featured the use of classical calorimetry and thermal analysis to investigate such disparate areas as organic and organo-metallic compounds on the one hand, and pyrotechnic systems on the other. This retrospective view is concerned in part with some of those issues that are as yet unresolved.

The effect of the reaction heat on kinetic analysis by TG under a rising temperature program: Part 3

In Parts 1 and 2 of this study (Thermochimica Acta 215 (1993) 83 and 97), the effect of the reaction heat changes on the rising temperature program was accounted for by using a relationship between the sample's temperature T and time t as a function of the degree of conversion α. The computer simulation and kinetic analysis in those publications dealt with two extreme situations. In the present study, the more common case is considered, in which the temperature recorded by the thermocouple has a value between those of the sample and the furnace. As before, a simulation of TG, DTG and T-t curves has been made, and a kinetic analysis has been achieved for the calculation of the Arrhenius parameters and the determination of the reaction mechanisms using the integral or differential methods. The results obtained show that either the kinetic parameters or the reaction mechanism changes as a result of the reaction heat. To obtain the correct mechanism and an accurate value of the kinetic parameters, it was found advantageous to use the initial decomposition data, rather than data for the whole decomposition period. The use of the initial decomposition data, however, makes it difficult to distinguish the mechanism but this can be overcome by using both single and multiple heating-rate kinetic analysis.

The thermal decomposition kinetics of CdCO 3 powder

In previous publications (Thermochimica Acta, 194 (1992) 375; 197 (1992) 363), we suggested the theoretical foundation for the interpretation of the decomposition kinetics of crystalline compacts. A solid AB decomposing according to an endothermic reaction AB(s) → A(s) + B(g) absorbs from the thermal reservoir the energy ϵ = zv in excess of the reaction enthalpy change Δ H, which allows the reactant to overcome the effects of heat and mass transfer and leads to the infinite separation of the reaction products in the z th vibration of frequency v. The vibrational quantum number z is not the same for compacts and powders. Covalent bonding in CdCO 3 also influences the decomposition kinetics.

A Word and the World: The Significance of Naming the Calorimeter

Previous articleNext article No AccessA Word and the World: The Significance of Naming the CalorimeterLissa RobertsLissa Roberts Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by Isis Volume 82, Number 2Jun., 1991 Publication of the History of Science Society Article DOIhttps://doi.org/10.1086/355725 Views: 10Total views on this site Citations: 8Citations are reported from Crossref Copyright 1991 History of Science Society, Inc.PDF download Crossref reports the following articles citing this article:Leonidas G. Ioannou, Josh Foster, Nathan B. Morris, Jacob F. Piil, George Havenith, Igor B. Mekjavic, Glen P. Kenny, Lars Nybo, Andreas D. Flouris Occupational heat strain in outdoor workers: A comprehensive review and meta-analysis, Temperature 9, no.11 (Apr 2022): 67–102.https://doi.org/10.1080/23328940.2022.2030634Mi Gyung Kim From phlogiston to caloric: chemical ontologies, Foundations of Chemistry 13, no.33 (Oct 2011): 201–222.https://doi.org/10.1007/s10698-011-9116-yDavid C. Frankenfield On heat, respiration, and calorimetry, Nutrition 26, no.1010 (Oct 2010): 939–950.https://doi.org/10.1016/j.nut.2010.01.002Yujing Li, Lars Wadsö, Lennart Larsson, Jonny Bjurman Correlating two methods of quantifying fungal activity: Heat production by isothermal calorimetry and ergosterol amount by gas chromatography–tandem mass spectrometry, Thermochimica Acta 458, no.1-21-2 (Jun 2007): 77–83.https://doi.org/10.1016/j.tca.2007.01.005Ruth Benschop What Is a Tachistoscope? Historical Explorations of an Instrument, Science in Context 11, no.11 (Sep 2008): 23–50.https://doi.org/10.1017/S0269889700002908 Bibliography, Osiris 9, no.11 (Oct 2015): 237–242.https://doi.org/10.1086/368738Theodore M. Porter Making Things Quantitative, Science in Context 7, no.33 (Sep 2008): 389–407.https://doi.org/10.1017/S0269889700001757Lissa Roberts Filling the Space of Possibilities: Eighteenth-Century Chemistry's Transition from Art to Science, Science in Context 6, no.22 (Sep 2008): 511–553.https://doi.org/10.1017/S0269889700001496

Investigation of subbituminous coals by thermogravimetry-mass spectrometry: Part 2. Formation of oxygen- and sulphur-containing products. kinetics of the overall mass loss

Results derived from the experiments of Part 1 of this paper (Szabó et al., Thermochimica Acta, 170 (1990) 167) are presented. The mass spectrometric intensities of the oxygen-containing decomposition products, as functions of the temperature, were wide curves with multiple peaks indicating the multiple sources of these compounds. H 2S, COS, CS 2 and CH 3SH evolved mainly in the temperature range of the decomposition of aliphatic structures. Their intensity curves, however, showed a second, sharp peak due to a reaction between iron sulphide, formed from pyrite, and water. SO 2 is believed to be a secondary product of pyrite decomposition. The kinetic evaluation of the mass loss of the sample was based on thermogravimetric results at heating rates of 5,10, 20, 40 and 80°C min −1. Parallel reactions were assumed without any restriction on the distribution of the activation energies and pre-exponential factors. The results indicated that the unimolecular dissociation of the chemical bonds may be rate-determining factors only at higher temperatures, after the evolution of more than 60% of the volatile matter from the sample. Below this region, low activation energies and pre-exponential factors were observed which may be due to diffusion control (at low temperatures) and a radical mechanism (at medium temperatures).

Some comments on the history of thermogravimetry

In a review of the authors about the history of vacuum microbalance techniques (including a chronology in table form), also published in Thermochimica Acta, (ref. 1) it uas pointed out, that also some corrections are to be made on the history of therinogravimetry. The first findings of balances are dated to about 3000 B.C. A gravimetric hygrometer is mentioned by Nicolaus Cusanus in 1450. In the 19th century chemical reactions at variable temperatures uere investigated using balances. The very beginning of the thermogravinietry is antedated to the work of Talabot who in 1833 at Lyon equipped a laboratory with thermobalances for quality control of Chinese silk.

The ancient egyptian balance - Part II

Continuation of the paper of Mikhail and Robens (Thermochimica Acta 82 (1984) 63-80; fig. nos. are continued from that paper); some extensions and corrections are made uith regard to the history of ancient Egyptian balances and the exhibits of the Cairo museum. Data presented in this paper should be used to replace those of Part I.

Disturbances in weighing - part II

Continuing the survey of disturbances which affect the accuracy of weighing in vacuum or in controlled atmosphere (published In Thermochimica Acta 82 (1984) 1, 42-50), the present paper deals with the following phenomena: - convectlve currents In the balance case - buoyancy - sorption effects and contamination - electrostatic effects.

How thermochimica acta began: Some recollections

The early history of Thermochimia Acta is described by the Editor-in-Chief. The journal was first proposed in 1968 while the first issue was published in 1970. The journal has grown from one volume in 1970 to eight volumes in 1980.

Thermal Analysis of Lignocellulosic Materials

Abstract Thermal analysis has recently become prominent, particularly in applications to fibers, plastics, and other synthetic polymeric materials. Thermal analysis may be defined as a set of techniques used to describe the physical or chemical changes associated with substances as a function of temperature [1]. Thermograms have been used to determine thermodynamic and kinetic parameters associated with the chemical changes which occur upon heating, the heat capacity of a substance, first- and second-order transition temperatures, latent heats of transformation, and effects of radiation or additives on natural and synthetic polymers. Particularly successful appears to be the simultaneous use of two or more thermal analytical techniques or the combination of thermal analytical and spectroscopic techniques (for example, infrared, electronic, and nuclear magnetic resonance analysis). The increasing commercial importance of polymers and the commercial manufacture of thermal analytical instruments have resulted in rising interest and intensified research in this field, with the number of articles published yearly on thermal analysis rapidly increasing. The journals Thermochimica Acta (published by Elsevier), the Journal of Thermal Analysis (published by the Hungarian Academy of Sciences), and the Japanese Journal of Calorimetry and Thermal Analysis are today the major sources of information on thermal analysis. The first two deal solely with reports of thermal analytical research.