Application of artificial neural nerworks in oxidation kinetic analysis of nanocomposites

Straszko, J.; Biedunkiewicz, A.; Strzelczak, Agnieszka

doi:10.2478/v10026-008-0031-5

Cited by 9 publications

(9 citation statements)

References 22 publications

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“…In conventional way of kinetic parameters determination from the Coats-Redfern equation statistic methods are used [10,11,[16][17][18][19]. Using this way the good results sometimes are not achieved.…”

Section: Application Of Coats-redfern Equationmentioning

confidence: 99%

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Analysis of (NH4)6Mo7O24·4H2O thermal decomposition in argon

Biedunkiewicz

Krawczyk

Gabriel-Półrolniczak

et al. 2013

J Therm Anal Calorim

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Nanometric carbides of transition metals and silicon are obtained by using precursors. Control of the course of these processes require data concerning transformations of single precursor, transformations of precursor in the presence of reducing agent and synthesis of the carbide. In this work, the way of investigating such processes is described on the example of thermal decomposition of (NH 4 ) 6 Mo 7 O 24 Á4H 2 O (precursor) in argon. The measurements were carried out by TG-DSC method. The solid products were identified by XRD method, and the gaseous products were determined by mass spectrometry method. There was demonstrated that the investigated process proceeded in five stages. Kinetic models (forms of f(a) and g(a) function) most consistent with experimental data and coefficients of Arrhenius equation A and E were determined for the stages. The Kissinger method and the Coats-Redfern equation were applied. In case of the Coats-Redfern equation, the calculations were performed by analogue method. In this way good consistency between the calculated and determined conversion degrees a(T) at practically constant values of A and E were obtained for distinguished stages and different sample heating rates.Keywords Decomposition of (NH 4 ) 6 Mo 7 O 24 Á4H 2 O in argon Á Thermal analysis Á Process kinetics Á Kissinger method Á Coats-Redfern equation Abbreviations APre-exponential Arrhenius factor/1 minConversion function dependent on mechanism of reaction f 0 (a m ) Derivative of f(a) function for maximal reaction rate u(T, a, P) Temperature, conversion degree and pressure function g(a)Integral form of kinetic model h(P)Pressure function k(T)Reaction rate constant/1 min

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Section: Application Of Coats-redfern Equationmentioning

confidence: 99%

“…In kinetic calculations, the results concerning TG and DTG, containing about 110 thousands values, were used. These sets were evaluated by neural networks method [19]. As described variables TG or DTG, and as describing variables T and b were used.…”

Section: Analysis Of Tg Dtg and Hf Plotsmentioning

confidence: 99%

Analysis of (NH4)6Mo7O24·4H2O thermal decomposition in argon

Biedunkiewicz

Krawczyk

Gabriel-Półrolniczak

et al. 2013

J Therm Anal Calorim

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“…The determined TGu values should depend only on temperature and heating rate of the samples. This was confirmed by neural networks method in reference [24]. All the series were considered simultaneously.…”

Section: Analysis Of Tgu Dtg and Hf Chartsmentioning

confidence: 63%

Methodology of Thermal Research in Materials Engineering

Biedunkiewicz¹

2012

Heat Treatment - Conventional and Novel Applications

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“…Dependency of the reaction rate on temperature was described applying Arrhenius equation. After separation of variables the reaction rate of particular stage in heterogeneous process is expressed as [9][10][11][12][13][14][15]:…”

Section: Methodsmentioning

confidence: 99%

Application of thermal analysis in nanotechnology

Biedunkiewicz

Gabriel

Figiel

et al. 2010

J Therm Anal Calorim

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The analysis of purification and carbonization process in argon with use of nc-TiC x /C powder, obtained by sol-gel method, is presented. TG-DSC measurements were carried out under non-isothermal and isothermal conditions. The samples were heated up in series to 1473, 1573, 1673, and 1773 K. For this series description of process kinetics is presented. Four stages of the process have been distinguished. Kinetics was described using Coats-Redfern equation. The kinetic parameters were determined for particular stages. Using obtained kinetic data, the analysis of the process was performed. The a(T) and r(a,T) dependencies on heating rate and temperature were investigated. In order to obtain high carbonization degree and carbide particles of small size, an appropriate temperature and time of process duration have to be determined. Appropriate carbonization and particles size were obtained for series heated up to 1570 K. It has been demonstrated that the oxygen, present at trace level in argon, can react with components of the system in certain range of temperature, influencing the quality of obtained product. The particles have been depicted by TEM method, whereas characterization of structure and particles size was performed by XRD method. MS method was used to determine evolved gaseous products.

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Application of artificial neural nerworks in oxidation kinetic analysis of nanocomposites

Cited by 9 publications

References 22 publications

Analysis of (NH4)6Mo7O24·4H2O thermal decomposition in argon

Analysis of (NH4)6Mo7O24·4H2O thermal decomposition in argon

Methodology of Thermal Research in Materials Engineering

Application of thermal analysis in nanotechnology

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