Results 131 to 140 of about 866 (174)
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Advanced isoconversional method
Journal of Theoretical Biology, 1997A nonlinear algorithm has been suggested to increase the accuracy of evaluating the activation energy by the integral isoconversional method. A minor modification of the algorithm has made it possible to adapt the isoconversional method for an arbitrary variation of the temperature.
Sergey Vyazovkin
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Journal of Thermal Analysis and Calorimetry, 2004
In this paper, fundamentals of the isoconversional methods are summarized and the methods are analyzed from the point of view of their correctness, their applications and the physical meaning of the activation parameters obtained. It is concluded that the activation parameters represent apparent quantities without a mechanistic interpretation.
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In this paper, fundamentals of the isoconversional methods are summarized and the methods are analyzed from the point of view of their correctness, their applications and the physical meaning of the activation parameters obtained. It is concluded that the activation parameters represent apparent quantities without a mechanistic interpretation.
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A consideration of errors and accuracy in the isoconversional methods
Thermochimica Acta, 2001Abstract The conventional isoconversional plots, ln β versus 1/ T and ln( β / T 2 ) versus 1/ T , have some errors in calculating the activation energy due to the use of an approximate value of p ( x ). In order to obtain the ‘exact’ value of activation energy of a reaction, an iterative procedure has been established after the ratios, H ( x ...
Masahiro Nakada
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Iterative linear integral isoconversional method: Theory and application
Bioresource Technology, 2012In this work, the theory of the iterative linear integral isoconversional method was illustrated in detail. This method allows the dependence of the activation energy (Eα) on the conversion degree to be accurately determined in a short time. Moreover, the method can yield the term [Aαf(α)] (Aα: the frequency factor at conversion α, f(α): the reaction ...
Junmeng Cai
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Integral, differential and advanced isoconversional methods
Chemometrics and Intelligent Laboratory Systems, 2009Alice Mija +2 more
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Vyazovkin’s isoconversional method as a universal approach
Thermochimica Acta, 2021Abstract The widespread use of the Vyazovkin’s method in the analysis of thermal dissociation of the solid phase by isoconversional methods prompted consideration of views regarding the kinetic triplet. We examined published data of thermal dissociation conducted for seven heating rates in two versions: analytical, where the constant incorporating ...
Andrzej Mianowski +2 more
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Isoconversional Methods in Thermodynamic Principles
The Journal of Physical Chemistry A, 2018The thermodynamic aspects of the methods commonly used in thermogravimetric analysis, that is, isothermal and dynamic, are presented. Models for isoconversional variants of dynamic methods are accepted. For the thermal dissociation of the solid phase, the free enthalpy of the system, called the Gibbs free energy state, and the stoichiometric principles
A. Mianowski, W. Urbańczyk
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Isoconversional Kinetics of Glass Aging
The Journal of Physical Chemistry B, 2009Differential scanning calorimetry (DSC) has been applied to study the enthalpy relaxation in maltitol glass at 39-42 degrees C. Isoconversional kinetic analysis of the data has revealed that the effective activation energy of the process increases significantly upon the conversion from the glassy to supercooled liquid state.
Kai, Chen, Sergey, Vyazovkin
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Isoconversional methods as single-step kinetic approximation
Thermochimica ActaNicolas Sbirrazzuoli, Sergey Vyazovkin
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Practical application of isoconversional methods
Thermochimica Acta, 1992Abstract The new possibilities offered by isoconversional methods as applied to the solution of practical kinetic problems are considered. These problems have been solved by algorithms based on the transformation-degree dependence of the activation energy calculated by the isoconversional method.
S.V. Vyazovkin, A.I. Lesnikovich
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