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Tangential area-proportional baseline interpolation for complex-process DSC data - Yes or no?
Authors: Svoboda Roman
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Thermochimica Acta
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 55-62
Titles:
Language Name Abstract Keywords
cze Tangenciální interpolace základní linie pro DSC data komplexních procesů - Ano či Ne? Byly provedeny teoretické simulace vývoje distorzí vznikajících z využití tangeciální interpolace nulové linie v jistých situacích odpovídajících specifickým termokinetickým průběhům pozadí. Efekt různých typů píků komplexních kinetických procesů a různých změn tepelné kapacity byl zkoumán. distorze dat; tangenciální interpolace základní linie; DSC; kinetická analýza; komplexní kinetika
eng Tangential area-proportional baseline interpolation for complex-process DSC data - Yes or no? Theoretical simulations were used to evaluate distortions arising from the usage of tangential area-proportional interpolation in certain situations corresponding the specific thermokinetic background courses. In particular, the effects of different types of complex kinetic peaks (consisting of overlapping sub-processes) and different heat capacity changes associated with the given sub-processes were investigated. Performance of the tangential area-proportional baseline was evaluated in terms of the magnitude of errors arising from the consequent kinetic analysis done on the basis of isoconversional methods and multivariate kinetic analysis. Apparent activation energy and pre-exponential factor were found to be only very weakly influenced by usage of tangential area proportional interpolation in most of the commonly encountered inappropriate situations. On the other hand, the model-based parameters (kinetic model exponents or even preference of certain model) can be significantly affected by usage of tangential area-proportional interpolation without the exact knowledge of the true course of thermokinetic background. These errors increase with decreasing relative magnitude of the given sub-peak. Largest errors (up to 20%) were then associated with determination of the integral area of the kinetic peak (quantity related to the specific enthalpy of the process). Data-distortion; Tangential area-proportional baseline; Kinetic analysis; Complex kinetics

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