Thermal Decomposition Kinetics
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Kinetics of Lumefantrine Thermal Decomposition Employing Isoconversional Models and Artificial Neural Network
Thermal analysis can be used to determine shelf-life and kinetic parameters in pharmaceutical systems. This work investigates the kinetic of lumefantrine thermal decomposition, an antimalarial, using non-isothermal and isothermal experimental data. The non-isothermal conditions are analyzed applying Vyazovkin method, while isothermal conditions employ models
J. Braz. Chem. Soc.. Publicado em: 2020-03
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2. DETERMINAÇÃO DOS PARÂMETROS CINÉTICOS E SIMULAÇÃO COMPUTACIONAL DO PERFLUOROPOLIÉTER (PFPE) EMPREGADO COMO LUBRIFICANTE SINTÉTICO
This work aims to determine the kinetic parameters of the thermal decomposition of a lubricating grease based on perfluoropolyether (PFPE) and the computational simulation of this decomposition. The determination of kinetic parameters of thermal decomposition was done by thermal analysis using thermogravimetry (TG) at different heating rates (β) of 10, 15 a
Quím. Nova. Publicado em: 26/08/2019
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3. Non-isothermal decomposition kinetics of conductive polyaniline and its derivatives
Abstract The non-isothermal decomposition kinetics of conductive polyaniline (PANI) and its derivatives, poly(o-methoxyaniline) (POMA) and poly(o-ethoxyaniline) (POEA), was investigated by thermogravimetric analysis (TGA), under inert and oxidative atmospheres, using Flynn-Wall-Ozawa’s approach to assess the kinetic parameters of the decomposition process
Polímeros. Publicado em: 21/09/2018
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4. Numerical Predictions for the Thermal History, Microstructure and Hardness Distributions at the HAZ during Welding of Low Alloy Steels
A phenomenological model to predict the multiphase diffusional decomposition of the austenite in low-alloy hypoeutectoid steels was adapted for welding conditions. The kinetics of phase transformations coupled with the heat transfer phenomena was numerically implemented using the Finite Volume Method (FVM) in a computational code. The model was applied to si
Mat. Res.. Publicado em: 05/04/2016
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5. Kinetic Parameters of Soot Oxidation Catalyzed by Nanosized ZnO-CeO2 Solids
Catalytic combustion of soot was performed over ZnO:CeO2 catalysts obtained via a non‑alkoxide sol-gel route. Different kinetics parameters were calculated through thermal analyses, thus, enabling the correlation between the experimental data and the decomposition mechanisms probably associated with the soot decomposition in each case.
J. Braz. Chem. Soc.. Publicado em: 2015-07
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6. Comparison of Kinetic Study of CTMA+ Removal of Molecular Sieve Ti-MCM-41 Synthesized with Natural and Commercial Silica
This work aimed to determine and compare the apparent activation energy, involved in thermal decomposition of CTMA+ from the pores of Ti-MCM-41 synthesized by two different source of silica in order to evaluate their influence in the template removal. The molecular sieves Ti-MCM-41 were synthesized using rice husk ash (RHA), as alternative low cost source of
Mat. Res.. Publicado em: 2015-06
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7. Kinetic study of the catalytic pyrolysis of elephant grass using Ti-MCM-41
This work aimed to study the kinetics of thermal and catalytic pyrolysis using Ti-MCM-41 as catalyst in order to assess the catalytic pyrolysis efficiency compared to thermal pyrolysis of elephant grass. Ti-MCM-41 molecular sieve was synthesized by hydrothermal method from hydrogel with the following molar composition:1.00 CTMABr: 4.00 SiO2:X TiO2: 1 + X Na2
Mat. Res.. Publicado em: 05/08/2014
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8. Evaluation of decomposition kinetics of poly (ether-ether-ketone) by thermogravimetric analysis
The non-isothermal thermogravimetric methods have been used extensively for the determination of kinetic parameters in polymers. The poly (ether ketones) are used as matrix in advanced high performance composites due its high thermal stability, excellent environmental performance and superior mechanical properties. In this work, the non-isothermal decomposit
Mat. Res.. Publicado em: 17/12/2013
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9. Bagaço do sorgo: estimativa de parâmetros cinéticos e pirólise analítica
Pyrolysis is currently the one of the most important technologies for transforming biomass into more useful products to society. Aiming to deepen the knowledge of the kinetics of pyrolysis, this study conducted an exploratory study of the decomposition of sorghum bagasse by thermogravimetry analysis (TG). The physicochemical characterization of sorghum bagas
Publicado em: 2011
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10. Caracterização termoanalítica e estudo de cura de compósito de resina epóxi e mica com propriedades elétricas isolantes aplicado em máquinas hidrogeradoras / Thermoanalytical Charactherization and Cure Study of an Epoxy resin and Mica Composite with Insulating Electrical Properties applied in Hydrogenerators Machines
Atualmente, a participação da energia elétrica na matriz energética mundial é um assunto em evidência. O estudo do compósito isolante da barra estatórica, um dos componentes principais da máquina hidrogeradora, permite a obtenção de informações físico-químicas relevantes ao aperfeiçoamento do sistema, e também de estudos de comportamento té
Publicado em: 2011
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11. Estudo de estabilidade do antibiótico meropenem / Stability study of the antibiotic meropenem
A estabilidade de medicamentos constitui um tema atual e de grande importância no meio científico. Tem sido constantemente abordada em estudos direcionados à avaliação da qualidade das preparações farmacêuticas. O meropenem, um antibiótico carbapenêmico de amplo espectro de ação, é utilizado como um importante recurso terapêutico para o tratame
Publicado em: 2011
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12. Thermal behavior and decomposition kinetics of rifampicin polymorphs under isothermal and non-isothermal conditions
O comportamento térmico de duas formas polimórficas da rifampicina foi estudado por DSC e TG/DTG. Os resultados termoanalíticos mostraram claramente as diferenças entre as duas formas cristalinas. O polimorfo I é a forma mais estável termicamente, a curva DSC não mostrou a fusão dessa espécie e o processo de decomposição térmica ocorreu próximo
Brazilian Journal of Pharmaceutical Sciences. Publicado em: 2010-06