Journal ArticleDOI
The baseline construction and its influence on the measurement of heat with differential scanning calorimeters
W. Hemminger,Stefan M. Sarge +1 more
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In this article, the shape of the interpolated baseline under a peak is determined by a change in the heat capacity of the sample and the heat transfer characteristics between sample and temperature sensor.Abstract:
In DSC's the shape of the interpolated baseline under a peak is determined by a change in the heat capacity of the sample and the heat transfer characteristics between sample and temperature sensor. The interpolated baseline is constructed according to formal criteria, experimentally or analytically on the basis of physico-chemical assumptions on the change of the heat capacity during transition. By the example of the melting of ice this paper shows analytically on the basis of a simple calorimeter model and a synthetic measuring curve, and experimentally, that the uncertainty of the enthalpy determination depends in general on the type of baseline and is in the order of magnitude of the repeatability of the DSC's (±0.5%).read more
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The caloric calibration of scanning calorimeters
Stefan M. Sarge,Eberhard Gmelin,G. W. H. Höhne,Heiko K. Cammenga,Wolfgang F. Hemminger,Walter Eysel +5 more
TL;DR: In this article, the authors present a recommendation of the GEFTA working group "Calibration of Scanning Calorimeters" allowing a precise heat and heat flow rate calibration of scanning calorimeters, largely independent of instrumental, sample related and experimental parameters.
Journal ArticleDOI
Thermal unfolding of beta-lactoglobulin, alpha-lactalbumin, and bovine serum albumin. A thermodynamic approach.
TL;DR: In this article, it was shown that the thermodynamic parameters of heat-induced unfolding, measured by differential scanning calorimetry, are closely related to the prevailing chemical conditions such as pH, concentration of ions, protein purity, and protein concentration.
Journal ArticleDOI
Isoconversional analysis of solid state transformations
Jordi Farjas,Pere Roura +1 more
TL;DR: In this article, the discrepancies between isoconversional methods when applied to complex transformations are analyzed and the authors conclude that conventional integral methods based on integrated equations are essentially incorrect when dealing with variable activation energy.
Journal ArticleDOI
Evaluating sadt by advanced kinetics-based simulation approach
Bertrand Roduit,Patrick Folly,B. Berger,Jörg Mathieu,Alexandre Sarbach,H. Andres,M. Ramin,B. Vogelsanger +7 more
Abstract: Present study depicts the extension of the method of the application of the advanced kinetic description of the energetic materials decomposition by its combination with the exact heat balance carried out by numerical analysis and the determination of the self-accelerating decomposition temperature (SADT). Moreover, the additional parameters such as thermal conductivity of the self-reactive substances, the type of containers and insulation layers, and different temperature profiles of the surrounding environment were taken into consideration. The results of DSC experiments carried out with different heating rates in the range of 0.25–4°C min−1 were elaborated by the Thermokinetics software. The application the Thermal Safety software and the kinetics-based approach led to proper selection of experimental conditions for SADT testing. The applied approach enabled the simulation of such scenario as the thermal ignition of self-reactive chemicals conditioned previously for 12 h at 80°C and exposed later isothermally for 8 h to temperatures between 120–180°C. Described method can be used for analysis of possible development of runaway during storage or transport of dangerous goods (TDG) and containers, and subsequent choice of the conditions that can prevent an accident.
Journal ArticleDOI
Temperature, heat and heat flow rate calibration of scanning calorimeters in the cooling mode
TL;DR: In this paper, a series of recommendations of the working group of the German Society for Thermal Analysis (GEFTA) for temperature, heat and heat flow rate calibration of scanning calorimeters is presented.
References
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Journal ArticleDOI
The Entropy of Water and the Third Law of Thermodynamics. The Heat Capacity of Ice from 15 to 273°K.
W. F. Giauque,J. W. Stout +1 more
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