Identifying better fitting function for asymmetric differential thermo gravimetric signal analysis

Abstract

Thermogravimetric analysis is one of the main technique used in solid state reaction kinetics studies. Unlike in gaseous and liquids state reactions, most solid-state reaction mechanisms are complex and comprise of simultaneous reactions. Curve fitting is one of the most used tool to obtain kinetic parameters such as activation energy and preexponential factor despite the reaction mechanism. Diferential Thermo Gravimetric (DTG) signals are asymmetric and its asymmetry depends on the kinetic triplet. Therefore, the use of symmetric functions such as Gaussian and Lorentzian to fit asymmetric DTG signals infer errors. To avoid that a new curve fitting method has been introduced in this study.