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Journal articles on the topic 'TG/DTG and DSC'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Charmas, Barbara, Karolina Kucio, Volodymyr Sydorchuk, Svitlana Khalameida, Magdalena Zięzio, and Aldona Nowicka. "Characterization of Multimodal Silicas Using TG/DTG/DTA, Q-TG, and DSC Methods." Colloids and Interfaces 3, no. 1 (December 28, 2018): 6. http://dx.doi.org/10.3390/colloids3010006.

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The formation of hierarchical, multimodal porosity materials with controlled shape and size of pores is the essential challenge in materials science. Properties of silica materials depend largely on different features: crystal structure, dispersity, surface composition, and porosity as well as the method of preparation and possible modification. In this paper, multimodal silicas obtained using different additives are presented. A-50 and A-380 aerosils and wide-porous SiO2 milled at 300 rpm were used as the additives in the sol stage at 20 °C, the sol–gel stage followed by hydrothermal modification (HTT) at 200 °C, or in the mechanochemical treatment (MChT) process. The characterizations were made by application of N2 adsorption/desorption, SEM imaging, quasi-isothermal thermogravimetry (Q-TG), dynamic thermogravimetry/derivative thermogravimetry/differential thermal analysis (TG/DTG/DTA), and cryoporometry differential scanning calorimetry (DSC) methods. Results showed that such a one-step preparation method is convenient and makes it possible to obtain multimodal silicas of differentiated porous structures and surface chemistry.

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2

Pereira, Bárbara Luísa Corradi, Angélica de Cássia Oliveira Carneiro, Ana Márcia Macedo Ladeira Carvalho, Paulo Fernando Trugilho, Isabel Cristina Nogueira Alves Melo, and Aylson Costa Oliveira. "Estudo da degradação térmica da madeira de Eucalyptus através de termogravimetria e calorimetria." Revista Árvore 37, no. 3 (June 2013): 567–76. http://dx.doi.org/10.1590/s0100-67622013000300020.

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O objetivo deste trabalho foi avaliar a degradação térmica da madeira de diferentes clones de Eucalyptus, por meio de análises termogravimétrica (TG/DTG) e de calorimetria exploratória diferencial (DSC), estabelecendo-se suas relações com a produção de carvão vegetal. Foram utilizados seis clones de Eucalyptus spp. aos 7,5 anos de idade, provenientes de um teste clonal pertencente a uma empresa florestal. Foram realizadas as análises TG/DTG e DSC, sob atmosfera de gás nitrogênio. As curvas TG/DTG mostraram três faixas de degradação térmica, atribuídas à secagem da madeira e à degradação de hemiceluloses e celulose. Não foi detectada faixa específica de degradação de lignina. As curvas DSC evidenciaram um pico endotérmico entre as temperaturas de 50 e 100 ºC, o que pode ser atribuído à perda de água da madeira. A liberação de calor iniciou-se em temperaturas acima de 275 ºC, para todos os clones avaliados, sendo observados dois picos exotérmicos. As análises térmicas da madeira (TG/DTG e DSC) não apresentaram variações expressivas entre os clones. Conclui-se que, através das técnicas estudadas, é possível identificar as principais fases das reações de liberação ou absorção de energia e perda de massa, que estão diretamente ligadas à qualidade do carvão vegetal.

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3

Prasad, M. R. R., K. Sudhakarbabu, B. Sreedhar, and D. Keerthi Devi. "A simultaneous TG-DTG-DSC-quadrupole mass spectrometric study." Journal of Thermal Analysis and Calorimetry 116, no. 2 (January 18, 2014): 1027–31. http://dx.doi.org/10.1007/s10973-013-3558-5.

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4

MORAIS, Francisca Edivânia, Sheila Pricila Marques CABRAL, Eliane Gonçalves ARAUJO, Carlos Alberto MARTINEZ-HUITLE, and Nedja Suely FERNANDES. "THERMAL BEHAVIOR OF PARACETAMOL AND TABLETS OF REFERENCE, GENÉRIC AND SIMILAR." Periódico Tchê Química 09, no. 17 (January 20, 2012): 28–37. http://dx.doi.org/10.52571/ptq.v9.n17.2011.17_periodico17_pgs_17_27.pdf.

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The present study utilized the thermoanalytical techniques (TG, DTG, DTA and DSC) to evaluate the thermal behavior of tablets containing paracetamol and marketed as reference, generic and similar. The samples were also characterized by IR, X-ray diffraction and SEM. The TG/DTG curves presented similar behaviour indicanting a low influence of the excipients present in pharmaceutical formulations. The DTA and DSC curves showed an endothermic peak between about 165.0 and 195.0 oC characteristic of melting of paracetamol in all samples. The X-ray diffraction patterns showed similarities and characterized the compounds as crystallines. The micrographs indicated heterogeneity in particle size.

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5

Hatakeyama, Tatsuko. "DSC,DTA,TG." Kobunshi 40, no. 4 (1991): 264–67. http://dx.doi.org/10.1295/kobunshi.40.264.

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6

Miyazaki, Caroline Lumi, Igor Studart Medeiros, Jivaldo do Rosário Matos, and Leonardo Eloy Rodrigues Filho. "Thermal characterization of dental composites by TG/DTG and DSC." Journal of Thermal Analysis and Calorimetry 102, no. 1 (March 20, 2010): 361–67. http://dx.doi.org/10.1007/s10973-010-0739-3.

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7

Tita, Ioana Cristina, Bogdan Tita, Claudia Crina Toma, Eleonora Marian, and Laura Vicas. "Thermal Behavoiur of Valsartan Active Substance and in Pharmaceutical Products." Revista de Chimie 68, no. 10 (November 15, 2017): 2307–10. http://dx.doi.org/10.37358/rc.17.10.5874.

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G/DTG and DSC curves provide important information regarding the physical properties of the pharmaceutical compounds (stability, compatibility, polymorphism, kinetic analysis, phase transitions etc). The thermal behaviour of valsartan was studied under dynamic nitrogen atmosphere, in comparison with pharmaceutical products containing the corresponding active substances. Also, the FT�IR spectra and X-ray diffactogram of the same samples were recorded. The main conclusion of this comparative study was that TG / DTG and DSC assays along with FT-IR spectra and X-ray diffractograms provide credible data for differences between active substance and pharmaceutical forms.

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8

Kaczmarska, Karolina, Sylwia Żymankowska-Kumon, Łukasz Byczyński, Beata Grabowska, Artur Bobrowski, and Sylwia Cukrowicz. "Thermoanalytical studies (TG–DTG–DSC, Py–GC/MS) of sodium carboxymethyl starch with different degrees of substitution." Journal of Thermal Analysis and Calorimetry 138, no. 6 (November 2, 2019): 4417–25. http://dx.doi.org/10.1007/s10973-019-08892-4.

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Abstract The paper presents the results of thermal analysis of polymer material in the form of starch derivatives in the form of sodium carboxymethyl starch (CMS–Na) with degree of substitution (DS) in the range 0.2–0.9 for the preparation of foundry binder. In this work, the thermal behavior of the modified starch and qualitative assessment of degradation products released during pyrolysis were determined and comprised. The analysis of the course of progressive decomposition of the starch material under controlled heating in the range of 25–1000 °C in anaerobic atmosphere was based on the results of thermal analysis methods (TG–DTG–DSC) in combination with the results of pyrolysis–gas chromatography–mass spectrometry (Py–GC/MS). The detailed TG–DTG–DSC analysis allowed to determine and compare the temperature at which the process of decomposition of carboxymethyl starches sodium salts with different degrees of substitution begins and to determine the course of its degradation under conditions corresponding to the contact of the foundry binder in the form of starch material with liquid metal (conditions like in foundry mold). Thermogravimetric analysis shows that decomposition processes are multistage, and dehydration is the first step of decomposition. Moreover, TG–DTG–DSC analyses indicate that the thermal stability and the decomposition path of tested compounds depend on the DS. Results of Py–GC/MS studies showed that the formation of decomposition products (including cyclic and aromatic hydrocarbons) in a predetermined temperature range is lower in the case of CMS–Na with high DS.

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9

ARAÚJO, Eliane Gonçalves, and Nedja Suely FERNANDES. "EVALUATION THERMOANALYTICAL OF WHEAT FLOUR FORTIFIED WITH FOLIC ACID AND FERROUS SULPHATE." Periódico Tchê Química 06, no. 12 (August 20, 2009): 47–50. http://dx.doi.org/10.52571/ptq.v6.n12.2009.48_periodico12_pgs_47_50.pdf.

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In this work wheat flour aditived with folic acid and iron sulphate was evaluated by Thermogravimetry (TG), Derivative Thermogravimetry (DTG) and differential scanning calorimetry (DSC) for evaluation of the thermal stability. The results obtained showed that the samples of wheat flour have similar behaviour.

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10

Kijo-Kleczkowska, Agnieszka, Adam Gnatowski, Magdalena Szumera, Henryk Otwinowski, Dariusz Kwiatkowski, and Łukasz Suchecki. "Effect of addition of coal sludge to polymeric material on thermal effects in analysis by TG/DTG/DSC methods." E3S Web of Conferences 154 (2020): 03002. http://dx.doi.org/10.1051/e3sconf/202015403002.

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The paper presents the application of thermal analysis methods in the study of various materials: coal sludge, polymeric material and composites of a polymer with coal sludge (fraction of coal sludge in composites: 1%, 3% and 5%). TG/DTG/DSC curves obtained during measurements in air atmosphere were analyzed. Polymers are used in many industries, that is why their thermal characteristics are so important. On the other hand, the mining industry, forced to supply power plants better quality fuel, must perform more thorough coal cleaning. This results in a continuous increase in waste in the form of coal sludge. The best method of disposing of these wastes is thermal utilisation (combustion and co-combustion), as well as use in composites with other materials. The aim of the study was to demonstrate the effect of the addition of coal sludge to the polymer on the energetic effect and the rate of mass change of the material sample during the thermal process by TG/DTG/DSC methods.

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11

Barcina, L. M., A. Espina, M. Suárez, J. R. García, and J. Rodríguez. "Characterization of monumental carbonate stones by thermal analysis (TG, DTG and DSC)." Thermochimica Acta 290, no. 2 (March 1997): 181–89. http://dx.doi.org/10.1016/s0040-6031(96)03074-2.

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12

Branco, C. H. D., A. L. Silva, J. M. Luiz, L. P. Mercuri, and J. R. Matos. "Caracterização de cálculos renais por análise térmica." Eclética Química 34, no. 1 (2009): 51–56. http://dx.doi.org/10.1590/s0100-46702009000100008.

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Dez amostras de cálculos renais foram estudadas por Análise Elementar de CHN (EA), Espectroscopia de Absorção no Infravermelho (IV) e Difração de raios X pelo método de Pó (XRD). O comportamento térmico das amostras foi estudado por Termogravimetria/Termogravimetria Derivada (TG/DTG) e por Calorimetria Exploratória Diferencial (DSC). Os resultados de EA, Espectroscopia de Absorção IV e XRD mostraram a presença de estruvita [NH4Mg(PO4).6H2O], apatita, oxalato de cálcio monohidratado e oxalato de cálcio dihidratado. As curvas TG e DSC permitiram classificar as amostras em dois grupos diferentes: Grupo I mostrando comportamento térmico típico de estruvita e Grupo II apresentando um perfil termoanalítico característico de mistura de oxalatos.

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13

Branco, C. H. D., A. L. Silva, Jose Marques Luiz, Lucildes Pita Mercuri, and Jivaldo Do Rosário Matos. "Caracterização de cálculos renais por análise térmica." Eclética Química Journal 34, no. 1 (January 23, 2018): 51. http://dx.doi.org/10.26850/1678-4618eqj.v34.1.2009.p51-56.

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Ten samples of kidney stone had been studied through elemental analysis of CHN (EA), Infrared Absorption Spectroscopy and X-Ray Powder Diffraction (XRD). The thermal behavior of the samples is studied by Thermogravimetry/Derivative Thermogravimetry (TG/DTG) and Differential Scanning Calorimetry (DSC). The results of AE, IV absorption Spectroscopy and XRD showed the presence of struvite (NH4Mg [PO4].6H2O), apatite, monohydrated calcium oxalate and dihydrated calcium oxalate. The TG and DSC curves allowed to classify the samples in two different groups: Group I show typical thermal behavior of struvite and Group II present a profile thermal analytical characteristic of a mixture of calcium oxalate.

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14

He, Xiao Fang, Chang Wen Miao, Yong Hao Wu, Xin Xin Cao, and Dan Liu. "Thermal Reaction Kinetics of Fly Ash Cement Paste at the Age of 28 Days." Applied Mechanics and Materials 668-669 (October 2014): 91–94. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.91.

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The thermal reaction kinetics of fly ash cement pastes were studied by Differential Scanning Calorimetry (DSC) and Thermal Gravity Analysis-Differential Thermal Gravity (TG-DTG) method, the kinetics parameters such as apparent activation energy was calculated by the Kissinger method, and the physical parameters were obtained. The result show that the fly ash cement pastes performance three endothermic reaction stages at different heating rates, peak temperatures of each stage at the range of 91.85~121.08°C, 453.93~496.48°C, and 680.21~751.62°C. TG-DTG show there were three thermal decomposition stages, thermal dehydration reaction apparent activation energy of fly ash cement pastes in each stage were 47.23kJ/mol, 128.84kJ/mol, and 134.07kJ/mol.

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15

CARVALHO FILHO, Marco Aurélio da Silva, and Massao IONASHIRO. "Thermal behaviour study of solid state compounds of manganese (II), zinc (II) and lead (II) with cinnamic acid." Eclética Química 23 (1998): 09–16. http://dx.doi.org/10.1590/s0100-46701998000100001.

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Compounds of cinnamic acid with manganese, zinc and lead have been prepared in aqueous solution. Thermogravimetry, derivative thermogravimetry (TG, DTG), differential scanning calorimetry (DSC), X-ray diffraction and complexometry have been used in the characterization as well as in the study of the thermal stability and interpretation concerning the thermal decomposition.

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16

CHAHUD, Marisa, Marco Aurélio da Silva CARVALHO FILHO, Nedja Suely FERNANDES, and Massao IONASHIRO. "A thermal analysis study of dithizone and dithizonates of mercury, silver and bismuth." Eclética Química 25 (2000): 9–17. http://dx.doi.org/10.1590/s0100-46702000000100001.

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Solid dithizonates of Hg(I), Ag(I) and Bi(III) have been prepared. Thermogravimetry (TG), derivative thermogravimetry (DTG), differential scanning calorimetry (DSC), X ray diffraction powder patterns and elemental analysis have been used to characterize and to study the thermal stability and thermal decomposition of the dithizone and of these dithizonates.

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17

Amorim, Pedro Henrique O., Ana Paula Garcia Ferreira, Luis Carlos M. Machado, Priscila Cervini, and Éder Tadeu Gomes Cavalheiro. "Investigation on the thermal behavior of β-blockers antihypertensives atenolol and nadolol using TG/DTG, DTA, DSC, and TG–FTIR." Journal of Thermal Analysis and Calorimetry 120, no. 1 (January 31, 2015): 1035–42. http://dx.doi.org/10.1007/s10973-014-4357-3.

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18

Tita, Ioana Cristina, Eleonora Marian, Bogdan Tita, Claudia Crina Toma, and Laura Vicas. "Thermal Behaviour of Candesartan Active substance and in pharmaceutical compounds." Revista de Chimie 68, no. 8 (September 15, 2017): 1895–902. http://dx.doi.org/10.37358/rc.17.8.5787.

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Thermal analysis is one of the most frequently used instrumental techniques in the pharmaceutical research, for the thermal characterization of different materials from solids to semi-solids, which are of pharmaceutical relevance. In this paper, simultaneous thermogravimetry/derivative thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC) were used for characterization of the thermal behaviour of candesartan cilexetil � active substance (C-AS) under dynamic nitrogen atmosphere and nonisothermal conditions, in comparison with pharmaceutical product containing the corresponding active substance. It was observed that the commercial samples showed a different thermal profile than the standard sample, caused by the presence of excipients in the pharmaceutical product and to possible interaction of these with the active substance. The Fourier transformed infrared spectroscopy (FT-IR) and X-ray powder diffraction (XRPD) were used as complementary techniques adequately implement and assist in interpretation of the thermal results. The main conclusion of this comparative study was that the TG/DTG and DSC curves, together with the FT-IR spectra, respectively X-ray difractograms constitute believe data for the discrimination between the pure substance and pharmaceutical forms.

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19

Petrunina, Elena Alexandrovna, OlgaOlga Aleksandrovna Shapchenkova, and SergeySergey Redzhinaldovich Loskutov. "PHYSICO-CHEMICAL PARAMETERS OF SIBERIAN LARCH (LARIX SIBIRICA) BARK EXTRACTED WITH WATER-AMINO-ALCOHOLIC EXTRACTANTS." chemistry of plant raw material, no. 2 (June 10, 2021): 103–7. http://dx.doi.org/10.14258/jcprm.2021028340.

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This paper presents the results of a thermal analysis, that involved thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC), of natural bark of Siberian larch (Larix sibirica Ldb.) vs. the bark extracted with 5% water-monoethanolamine (MEA) and (vs.) 5% water-triethanolamine (TEA). Thermogravimetric data obtained in an oxidative (air) atmosphere allowed us to identify temperature ranges of thermal decomposition stages for the larch bark samples, as well as to determine the corresponding mass loss and mass loss rate at programmed heating. The Ozawa-Flynn-Wall (OFW) method was used to calculate the dependence of activation energy of the thermal decomposition of experimental samples on the conversion degree (Еа = f(a)); the symbate run of Еа = f(a) curves was established. The DSC data obtained agreed with those of TG/DTG. The integral heat of the bark thermal decomposition (9.60 kJ/g and 14.12 kJ/g for MEA and TEA, respectively) indicated the bark to be competitive with other biofuels, such as briquetted lignin, wood pellets, sunflower husk, rapeseeds, and straw.

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20

Kijo-Kleczkowska, Agnieszka, Adam Gnatowski, Magdalena Szumera, and Dariusz Kwiatkowski. "Application of thermal analysis methods in researches of polyamide, coal fuels and their composites." Polish Journal of Chemical Technology 22, no. 1 (March 1, 2020): 6–9. http://dx.doi.org/10.2478/pjct-2020-0002.

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AbstractThis paper presents an analysis of DSC/TG/DTG thermal studies for PA6 polyamide, coal fuels and polyamide composites with these materials. The test results are aimed at comparing the thermal effects and behavior of these materials under high temperature conditions and are the basics to know of the creation and use of polymer composites with various coal fillers.

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21

da Silva Morais, Crislene Rodrigues, Wilton Silva Lopes, A. G. de Souza, and P. D. Santa-Cruz. "Synthesis and Thermal Characterization of Luminescent Powers of Terbium (III) with Mixed Ligands." Materials Science Forum 498-499 (November 2005): 535–39. http://dx.doi.org/10.4028/www.scientific.net/msf.498-499.535.

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This work deals with the synthesis and thermal decomposition of complexes of general formula: Ln(ß-dik)3L (where Ln=Tb+3, ß-dik=4,4,4-trifluoro-1-phenyl-1,3- butanedione(btfa) and L=1,10-fenantroline(phen) or 2,2-bipiridine(bipy). The powders were characterized by melting point, FTIR spectroscopy, UV-visible, elemental analysis, scanning differential calorimeter(DSC) and thermogravimetry(TG). The TG/DSC curves were obtained simultaneously in a system DSC-TGA, under nitrogen atmosphere. The experimental conditions were: 0.83 ml.s-1 carrier gas flow, 2.0±0.5 mg samples and 10°C.min-1 heating rate. The CHN elemental analysis of the Tb(btfa)3bipy and Tb(btfa)3phen complexes, are in good agreement with the expected values. The IR spectra evinced that the metal ion is coordinated to the ligands via C=O and C-N groups. The TG/DTG/DSC curves of the complexes show that they decompose before melting. The profiles of the thermal decomposition of the Tb(btfa)3phen and Tb(btfa)3bipy showed six and five decomposition stages, respectively. Our data suggests that the thermal stability of the complexes under investigation followed the order: Tb(btfa)3phen < Tb(btfa)3bipy.

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22

dos Santos, A. V., and J. R. Matos. "Dehydration studies of rare earth p-toluenesulfonate hydrates by TG/DTG and DSC." Journal of Alloys and Compounds 344, no. 1-2 (October 2002): 195–98. http://dx.doi.org/10.1016/s0925-8388(02)00339-0.

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23

Kök, M. V. "Non-isothermal DSC and TG/DTG analysis of the combustion of Si̇lopi̇ asphaltites." Journal of Thermal Analysis and Calorimetry 88, no. 3 (June 2007): 663–68. http://dx.doi.org/10.1007/s10973-006-8028-x.

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24

Cucos, Andrei, and Petru Budrugeac. "Simultaneous TG/DTG–DSC–FTIR characterization of collagen in inert and oxidative atmospheres." Journal of Thermal Analysis and Calorimetry 115, no. 3 (March 26, 2013): 2079–87. http://dx.doi.org/10.1007/s10973-013-3116-1.

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25

Kostova, B., V. Petkova, Vl Kostov-Kytin, Y. Tzvetanova, and G. Avdeev. "TG/DTG-DSC and high temperature in-situ XRD analysis of natural thaumasite." Thermochimica Acta 697 (March 2021): 178863. http://dx.doi.org/10.1016/j.tca.2021.178863.

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Carvalho, C. T., A. B. Siqueira, E. C. Rodrigues, and M. Ionashiro. "Synthesis, characterization and thermal behaviour of solid-state compounds of 2-methoxybenzoate with some bivalent transition metal ions." Eclética Química 30, no. 4 (2005): 19–26. http://dx.doi.org/10.1590/s0100-46702005000400003.

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Solid-state M-2-MeO-Bz compounds, where M stands for bivalent Mn, Co, Ni, Cu and Zn and 2-MeO-Bz is 2-methoxybenzoate, have been synthesized. Simultaneous thermogravimetry-differential thermal analysis (TG-DTA), thermogravimetry, derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), X-ray powder diffractometry, infrared spectroscopy and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to have information about the composition, dehydration, thermal stability and thermal decomposition of the isolated compounds.

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27

Bi, Ai Hong, and Jin Hua Zhu. "Syntheses and Thermo-Decomposition Process of the Co-Doping VO₂(M) Precursor." Materials Science Forum 663-665 (November 2010): 1289–92. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1289.

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The precursor doped with W6+ and Mo6+ ionic was prepared using oxalic acid as reduction acid, V2O5 as vanadium source, (NH4)6W7O24·6H2O and (NH4)6Mo7O24·4H2O as doped sources. The morphology, composition, structure and the thermo-decomposing process of the precursor were characterized by means of SEM, EDS, FTIR and DSC/TG/DTG. The thermal decomposition was confirmed by XRD.

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28

SCHNITZLER, Egon, Wilson COSTA, Cristo Bladimiros MELIOS, Maria Ines Gonçalves LELES, and Massao IONASHIRO. "Thermal behavior studies of solid state compounds of 4-dimethylaminocinnamylidenepyruvate with alkali earth metals, except beryllium and radium." Eclética Química 25 (2000): 31–39. http://dx.doi.org/10.1590/s0100-46702000000100003.

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Solid state compounds of general formula M(DMCP)2.nH2O, where M represents Mg, Ca, Sr, Ba, and DMCP is 4-dimethylaminocinnamylidenepyruvate, and n = 1, except for Ca, where n = 2.5, have been prepared. Thermogravimetry, derivative thermogravimetry (TG, DTG), differential scanning calorimetry (DSC), X-ray diffraction powder patterns and complexometry were used to characterize and to study the thermal decomposition of these compounds.

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29

Li, Zai Yuan, Kai Yu, Yun Gao, Jie Liu, Duo Jin, and Yu Chun Zhai. "Effect of Particle Size on Hydrogen Reduction Reaction Kinetics Parameters of Cu₂O Powders." Materials Science Forum 694 (July 2011): 769–72. http://dx.doi.org/10.4028/www.scientific.net/msf.694.769.

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The 0.4mol•L-1CuSO4 liquor and 5mol•L-1NaOH liquor were prepared by CuSO4•5H2O and NaOH as raw materials. The Cu2O powders were prepared by dextrose reducer and PVP dispersant. The DTA-TG-DTG curves obtaining is by SDT 2960 Simultaneous DSC-TGA analysis apparatus. The mensuration condition that rise temperature velocity was 15°C•min-1 and reduction reaction gas was N2 and H2 admixture gas. The kinetics was analysed by DTA-TG-DTG curves. The result indicate that form of CuO was sphericity，the CuO granularity was about 100、200、1000nm. The apparent activation energy leave each other 165.24、247.65、327.01 KJ•mol-1, increase with granularity Cu2O. The frequency gene leave each other 1.22×1016、2.84×1022、1.41×1030, increase with granularity Cu2O. The reaction progression leave each other 1.20、1.12、1.05, decrease with granularity Cu2O.

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30

Wen, Pu Hong. "Kinetic Investigation of Thermal Decomposition Reactions of 4'-Demethypodophyllotoxin and Podophyllotoxin." Advanced Materials Research 800 (September 2013): 517–21. http://dx.doi.org/10.4028/www.scientific.net/amr.800.517.

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The thermal behavior and thermal decomposition kinetic parameters of podophyllotoxin (PPT) and 4-demethypodophyllotoxin (DMPPT) in a temperature-programmed mode have been investigated by means of DSC and TG-DTG. The kinetic model functions in differential and integral forms of the thermal decomposition reactions mentioned above for leading stage were established. The kinetic parameters of the apparent activation energy Ea and per-exponential factor A were obtained from analysis of the TG-DTG curves by integral and differential methods. The most probable kinetic model function of both decomposition reactions in differential form was (1-α) 2. The values of Ea indicated that the reactivity of PPT was higher than that of DMPPT in the thermal decomposition reaction. The values of the entropy of activation ΔS≠, enthalpy of activation ΔH≠ and free energy of activation ΔG≠ of the reactions were estimated.

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31

ZAINA CHIARETTO, Ana Glauce, Marco Aurélio da Silva CARVALHO FILHO, Nedja Suely FERNANDES, and Massao IONASHIRO. "Preparation and thermal decomposition of solid state cinnamates of alkali earth metals, except beryllium and radium." Eclética Química 23 (1998): 91–98. http://dx.doi.org/10.1590/s0100-46701998000100008.

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Solid state compounds of general formula ML2.nH2O [where M is Mg, Ca, Sr or Ba; L is cinnamate (C6H5 -CH=CH-COO-) and n = 2, 4, 0.8, 3 respectively], have been synthetized. Thermogravimetry (TG), derivative thermogravimetry (DTG), differential scanning calorimetry (DSC) and X-ray diffraction powder patterns have been used to characterize and to study the thermal stability and thermal decomposition of these compounds.

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32

Czylkowska, Agnieszka, Bartłomiej Rogalewicz, Anita Raducka, Natalia Błaszczyk, Tomasz Maniecki, Kinga Wieczorek, and Paweł Mierczyński. "Synthesis, Spectroscopic, Thermal and Catalytic Properties of Four New Metal (II) Complexes with Selected N- and O-Donor Ligands." Materials 13, no. 14 (July 20, 2020): 3217. http://dx.doi.org/10.3390/ma13143217.

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Four solid compounds with formulae: Co(OAc)2(Im)·H2O (I), Ni(OAc)2(Im)1.5·2H2O (II), Cu2(OAc)4(Im) (III) and Zn(OAc)2(Im)·H2O (IV) (where: Im = 1H-Imidazole) were prepared and characterized by chemical and elemental analysis, powder X-ray diffraction patterns and FTIR spectroscopy. Catalytic properties of each complex for styrene oxidation reaction were investigated. Furthermore, thermal properties of compounds were studied using the TG-DTG and DSC techniques under dry air atmosphere. Additionally, volatile thermal decomposition and fragmentation products were also investigated using the TG-FTIR spectra in air.

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33

Zhang, Chuan Cheng, Hai Jun Lu, and Zhan Wen He. "Combustion Characteristics of Biomass and its Cellulose." Advanced Materials Research 306-307 (August 2011): 143–46. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.143.

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The combustion characteristics of some biomass samples, such as rice straw and its cellulose, were investigated. Non-isothermal thermogravimetry, where the sample was heated in air and the temperature of which increased at a linear rate of 10°C/min, 20°C/min, 30°C/min, was used to investigate the combustion characteristics of the biomass samples. The differences in the TG-DTG-DSC curves of the samples were determined and discussed in detail. Conventional TG parameters, ignition index of samples were estimated which provided elaborate information on their basic combustion features. Results showed that cellulose with higher combustion characteristics.

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34

Li, Zai Yuan, Yu Chun Zhai, and Myongil Pang. "Effect of Particle Size on Oxidation Reaction Kinetics Parameter of Cu₂O Powders." Advanced Materials Research 284-286 (July 2011): 726–29. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.726.

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The 0.4mol•L-1CuSO4liquor and 5mol•L-1NaOH liquor were prepared by CuSO4·5H2O and NaOH as raw materials. The Cu2O powders were prepared by dextrose reducer and PVP dispersant. The Cu2O oxidation reaction DTA-TG-DTG curves were obtained by SDT 2960 simultaneous DSC-TGA analysis apparatus. The mensuration condition were that rise temperature velocity 15°C·min-1and deoxidize gas air. The Cu2O oxidation reaction kinetics was calculated by DTA-TG-DTG curves data. The results indicate that the cuprous oxide powders shape were spherical, their particle’ sizes were 100,200,1000nm. Their apparent activation energy were 164.38, 175.54, 282.65 KJ·mol-1, the apparent activation energy increase with Cu2O particle’ size. Their frequency factors were 1.22×1013, 1.40×1013, 2.88×1020, the frequency factors increase with particle’ size Cu2O. Their reaction progressions were 1.02, 1.00, 0.96, the reaction progression increase with Cu2O particle’ size decreased.

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35

Chen, Bo, Bo Liu, and Zhangming Shi. "Combustion Characteristics and Combustion Kinetics of Dry Distillation Coal and Pine Tar." International Journal of Aerospace Engineering 2020 (November 26, 2020): 1–7. http://dx.doi.org/10.1155/2020/8888556.

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The samples of dry distillation pine tar and coal tar were investigated by TG-DTG-DSC, and the combustion characteristics and combustion kinetics of the samples were studied. The results show that there exist two significant mass loss peak and endothermic peak in the combustion of dry distillation coal tar and pine tar, which, respectively, means the volatile hydrocarbon combustion and heavy hydrocarbon combustion. At the first DTG peak range, the activation energy of dry distillation pine tar and coal tar is about the same at the initial stage (before DTG peak). Activation energy of the dry distillation pine tar increases sharply while that of dry distillation coal tar has little changes on the subsequent stage (after DTG peak). Dry distillated coal tar has better ignition performance, combustible characteristic, combustible stability, and integrated combustion characteristic, but difficult to burnout compared to the dry distillation pine tar.

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36

LELES, Maria Ines Gonçalves, Cristo Bladimiros MELIOS, Lázaro Moscardini D’ASSUNÇÃO, and Massao IONASHIRO. "Preparation and thermal behavior of mixture of basic carbonate and 4-dimethylaminocinnamylidenepyruvate with lanthanides (III) and yttrium (III) in the solid state." Eclética Química 24 (1999): 29–44. http://dx.doi.org/10.1590/s0100-46701999000100003.

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Solid Ln-OHCO3-DMCP compounds, where Ln represents lanthanides (III) and yttrium (III) ions and DMCP is the anion 4-dimethylaminocinnamylidenepyruvate, have been prepared. Thermogravimetry, derivative thermogravimetry (TG, DTG), differential scanning calorimetry (DSC), x-Ray diffraction powder patterns and elemental analysis have been used to characterize the compounds. The thermal stability as well as the thermal decomposition of these compounds were studied using an alumina crucible in an air atmosphere.

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37

Yu-Ting, Zhao, Zhang Jian-Hua, Sun Tong-Shan, and Yang Zhao-He. "Reduced equations to estimate kinetic parameters from non-isothermal TG-DTG or DSC curves." Thermochimica Acta 223 (August 1993): 101–8. http://dx.doi.org/10.1016/0040-6031(93)80124-s.

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38

Mothé, Cheila Gonçalves, and Jaqueline Souza de Freitas. "Thermal behavior of cashew gum by simultaneous TG/DTG/DSC-FT-IR and EDXRF." Journal of Thermal Analysis and Calorimetry 116, no. 3 (April 22, 2014): 1509–14. http://dx.doi.org/10.1007/s10973-014-3788-1.

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39

Santos, Priscila L., Adriano A. S. Araújo, Jullyana S. S. Quintans, Makson G. B. Oliveira, Renan G. Brito, Mairim R. Serafini, Paula P. Menezes, et al. "Preparation, Characterization, and Pharmacological Activity ofCymbopogon winterianusJowitt ex Bor (Poaceae) Leaf Essential Oil ofβ-Cyclodextrin Inclusion Complexes." Evidence-Based Complementary and Alternative Medicine 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/502454.

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This study aimed to evaluate the orofacial antinociceptive effect of theCymbopogon winterianusessential oil (LEO) complexed inβ-cyclodextrin (LEO-CD) and to assess the possible involvement of the central nervous system (CNS). The LEO was extracted, chromatographed, and complexed inβ-cyclodextrin. The complex was characterized by differential scanning calorimetry (DSC) and thermogravimetry derivative (TG/DTG). Male Swiss mice (2-3 months) were treated with LEO-CD (50–200 mg/kg, p.o.), vehicle (distilled water, p.o.), or standard drug (i.p.) and subjected to the orofacial nociception formalin-, capsaicin-, and glutamate-induced. After the formalin test, the animals were perfused and the brains subjected to immunofluorescence for Fos. The rota-rod test (7 rpm/min) was carried out. Geraniol (37.57%) was the main compound of LEO. DSC and TG/DTG proved the complexation. The orofacial nociceptive behavior was significantly (p<0.05) reduced. The number of Fos-positive cells was significantly changed in the dorsal raphe nucleus (p<0.01), locus coeruleus (p<0.001), trigeminal nucleus (p<0.05), and trigeminal thalamic tract (p<0.05). LEO-CD did not cause changes in motor coordination in the rota-rod test. Thus, our results suggested that LEO-CD has an orofacial antinociceptive profile, probably mediated by the activation of the CNS without changing the motor coordination.

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40

Alver, Burcu Erdoğan, Meryem Sakizci, and Ertuğrul Yörükoğullari. "Investigation of clinoptilolite rich natural zeolites from Turkey: a combined XRF, TG/DTG, DTA and DSC study." Journal of Thermal Analysis and Calorimetry 100, no. 1 (June 19, 2009): 19–26. http://dx.doi.org/10.1007/s10973-009-0118-0.

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41

Boonchom, Ban Jong, Chesta Ruttanapun, Montree Thongkam, Pachernchaipat Chaiyasith, Somsak Woramongkonchai, Samart Kongteweelert, and Naratip Vittayakorn. "A New Synthesis of BaHPO₄ Precipitated by BaCO₃-H₃PO₄-NaOH System at Room Temperature." Advanced Materials Research 717 (July 2013): 37–43. http://dx.doi.org/10.4028/www.scientific.net/amr.717.37.

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Barium hydrogenphosphate, BaHPO4 was synthesized for the first time through simple and rapid method using BaCO3-H3PO4-NaOH, pH =9.0 at room temperature for 30 min. The studied BaHPO4 decomposed in a single well-defined stage via deprotonated hydrogenphosphate reactions, revealed by TG/DTG and DSC techniques. The calculated wavenumbers based on DSC peak were comparable with FTIR results, which support the breaking bonds of P-OH (HPO42-) in the deprotonated hydrogenphosphate reactions. The thermodynamic functions (ΔH*, ΔG*, and ΔS*) for the deprotonated hydrogenphosphate reactions calculated from DSC data indicate that the deprotonated HPO42- reaction occur a lower-energy pathway and spontaneous process. The FTIR, XRD and SEM data of the studied BaHPO4 and its decomposed product Ba2P2O7 are also reported.

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42

Siqueira, A. B., C. T. de Carvalho, E. C. Rodrigues, E. Y. Ionashiro, G. Bannach, and M. Ionashiro. "Synthesis, characterization and thermal behaviour on solid pyruvates of light trivalent lanthanides." Eclética Química 32, no. 4 (2007): 49–54. http://dx.doi.org/10.1590/s0100-46702007000400007.

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Solid State Ln-L compounds, where Ln stands for light trivalent lanthanides (La - Gd) and L is pyruvate, have been synthesized. Thermogravimetry and derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), X-Ray powder diffractometry, infrared spectroscopy, elemental analysis, and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, ligand denticity, thermal behaviour and thermal decomposition of the isolated compounds.

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43

Siqueira, A. B., C. T. de Carvalho, E. Y. Ionashiro, and M. Ionashiro. "Synthesis, characterization and thermal behaviour on solid pyruvates of some bivalent metal ions." Eclética Química 34, no. 2 (2009): 15–21. http://dx.doi.org/10.1590/s0100-46702009000200002.

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Solid state M-L compounds, were M stands for bivalent Mn, Fe, Co, Ni, Cu, Zn and L is pyruvate, have been synthesized. Thermogravimetry and derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), X-Ray powder diffractometry, infrared spectroscopy, elemental analysis, and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, ligand denticity, and thermal decomposition of the isolated compounds.

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De Siqueira, Adriano Buzutti, Cláudio Teodoro De Carvalho, Elias Yuki Ionashiro, and Massao Ionashiro. "Synthesis, characterization and thermal behaviour on solid pyruvates of some bivalent metal ions." Eclética Química Journal 34, no. 2 (January 24, 2018): 15. http://dx.doi.org/10.26850/1678-4618eqj.v34.2.2009.p15-21.

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Solid state M-L compounds, were M stands for bivalent Mn, Fe, Co, Ni, Cu, Zn and L is pyruvate, have been synthesized. Thermogravimetry and derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), X-Ray powder diffractometry, infrared spectroscopy, elemental analysis, and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, ligand denticity, and thermal decomposition of the isolated compounds.

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45

Wen, Pu Hong. "Kinetic Investigation of Thermal Decomposition Reactions of Podophyllic Acid and Picropodophyllic Acid." Advanced Materials Research 391-392 (December 2011): 1230–34. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.1230.

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The thermal behavior and thermal decomposition kinetic parameters of podophyllic acid and picropodophyllic acid in a temperature-programmed mode have been investigated by means of DSC and TG-DTG. The kinetic model functions in differential and integral forms of the thermal decomposition reactions mentioned above for leading stage were established. The kinetic parameters of the apparent activation energy Ea and per-exponential factor A were obtained from analysis of the TG-DTG curves by integral and differential methods. The most probable kinetic model function of the decomposition reaction in differential form was 2/3•α-1/2 for podophyllic acid and 1/2• (1-α)-1 for picropodophyllic acid. The values of Ea indicated that the reactivity of picropodophyllic acid was highter than that of podophyllic acid in the thermal decomposition reaction. The values of the entropy of activation ΔS≠, enthalpy of activation ΔH≠ and free energy of activation ΔG≠ of the reactions were estimated.

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46

Brzezińska, Rita, Agata Górska, Magdalena Wirkowska-Wojdyła, Ewa Ostrowska-Ligęza, and Joanna Bryś. "Thermal and Kinetic Properties of Brazilian Coffea Arabica Beans." Applied Sciences 11, no. 14 (July 8, 2021): 6324. http://dx.doi.org/10.3390/app11146324.

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The chemical composition of green coffee beans depends on the number of parameters, such as coffee cherry processing methods, used. The quality of roasted coffee is related to the certain substances that developed during the roasting process and that are responsible for the organoleptic properties. The main objective of this study was an investigation of the thermal behaviour and the fatty acids profile of green and roasted Brazilian Santos coffee beans. The glass transition temperature was measured using modulated differential scanning calorimetry (MDSC). The thermal behaviour of coffee samples was evaluated by means of thermogravimetry (TG) and first derivative thermogravimetry (DTG). The oxidative stability and kinetic parameters were characterized with the use of differential scanning calorimetry (DSC). According to the TG and DTG curves, coffee samples showed different behaviour of thermal degradation in the atmosphere of oxygen and nitrogen. Our research shows that the thermal properties and fatty acids profile did not change during the roasting process.

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47

Yang, Hui Fang, Shu Xia Ren, Lei Sun, and Huang Li. "Synthesis, Characterization and Properties of Rare Earth Complexes with Caprolactam." Applied Mechanics and Materials 707 (December 2014): 73–76. http://dx.doi.org/10.4028/www.scientific.net/amm.707.73.

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Three rare earth complexes of (Eu (C6H11NO)8, La0.6Eu0.4(C6H11NO)6, Tb0.5Eu0.5(C6H11NO)6(H2O)) were synthesized by solid-state method. The as-prepared complexes were characterized by elemental analysis, thermogravimetry-differential thermogravimetry-differential scanning calorimetry (TG-DTG-DSC), infrared (IR) spectra and fluorescence spectra. The results showed that complexed were prepared by the rare earth ions directly bonded to oxygen atoms of caprolactam ligand and emitted a characteristic fluorescence of the Eu3 +or Tb3+ions.

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48

Payolla, Filipe Boccato, Sidney José Lima Ribeiro, and Antonio Carlos Massabni. "Síntese e caracterização de sabões metálicos de lantanídios (III)." Eclética Química Journal 40, no. 1 (September 26, 2015): 155. http://dx.doi.org/10.26850/1678-4618eqj.v40.1.2015.p155-165.

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The present study describes synthesis and parcial characterization of Eu3+, Nd3+, Dy3+, Tb3+ and Yb3+ behenate complexes. The compounds were analyzed using IR-Spectroscopy, TG-DTG, DSC, elemental analysis, XRD, luminescence and SEM. The results show the purity of the compounds. The XRD analysis and the SEM images show the high cristalinity of the complexes. TG-DTG and DSC analyses do not show a liquid crystal behavior, as occurs with other lanthanide metallic soaps. The mass loses until 1000° C show that the compounds lose ligand fragments at specific temperatures. XRD of the residues are compatible with the respective lanthanide oxides. The luminescence analysis shows that the Eu3+, Nd3+ and Tb3+ complexes presents appreciable emission. The Judd-Ofelt parameters obtained are compatible with the values found in the literature. It was not possible to obtain the complexes in a glass-form because it is difficult to prevent the crystallization of the complexes even using liquid nitrogen. The XDR data indicate that one of the complexes axis has 52 Å of length, agreeing with a structure containing behenate-lanthanide ion-behenate. The structures of the complexes were not fully elucidated and more analyses are necessary. The complexes presented a molar ratio of 3:1 (L:M) and were formulated as Bh3Eu, Bh3Nd, Bh3Dy, Bh3Tb e Bh3Yb (Bh = behenate anion).

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Yang, Shuang Ping, Jie Dong, and Miao Wang. "Experiment on Combustion-Supporting Agent on PCI for Combustibility of Coal Powder." Materials Science Forum 658 (July 2010): 248–51. http://dx.doi.org/10.4028/www.scientific.net/msf.658.248.

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In order to improve the combustion effects of pulverized coal and replacement ratio of coals, the combustion- supporting mechanism, development and applications are analyzed and industry experiment are carried out based on the research of combustion- supporting agent without alkalis on coals combustion with TG- DTG- DSC ways. The results show that there is an optimum addition percent for coals combustion with combustion- supporting agent. The coal ratio and coke ratio are improved obviously with 1.7%combustion- supporting agent in LongGang.

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Liao, Xiao Xue, Shuang Quan Liao, Bing Tang, Ming Chao Luo, Yan Fang Zhao, and Hai Sheng Tan. "Study on Thermal and Mechanical Properties of Natural Rubber Latex Modified by Trichlorobromomethane." Advanced Materials Research 295-297 (July 2011): 36–40. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.36.

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Natural rubber latex (NRL) modified by holgonated addition with trichlorobromomethane was prepared. The thermal properties of modified NRL were analyzed by thermogravimetric analysis (TG/DTG),differential scanning calorimetry (DSC) and dynamic mechanical analysis(DMA). The results showed that the thermal stability of modified NRL was lower than NRL and the thermal degradation of modified NRL was two-stage decomposition. With increasing of stress frequency, loss modulus and storage modulus of latex increased,while loss modulus and storage modulus of modified latex decreased,compared with NRL.

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