scholarly journals Caracterização de cálculos renais por análise térmica

2018 ◽  
Vol 34 (1) ◽  
pp. 51
Author(s):  
C. H. D. Branco ◽  
A. L. Silva ◽  
Jose Marques Luiz ◽  
Lucildes Pita Mercuri ◽  
Jivaldo Do Rosário Matos
Keyword(s):  
Calcium Oxalate ◽  
Thermal Behavior ◽  
Absorption Spectroscopy ◽  
Kidney Stone ◽  
Analytical Characteristic ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Group I ◽  
Dsc Curves ◽  
Derivative Thermogravimetry

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.

scholarly journals Thermal behaviour studies of solid state compounds of cinnamylidenepyruvate with trivalent lanthanides and yttrium (III) in an atmosphere of CO2

2002 ◽  
Vol 27 (0) ◽  
Author(s):  
José Dilson Silva de OLIVEIRA ◽  
Fernando Luís FERTONANI ◽  
Cristo Bladimiros MELIOS ◽  
Massao IONASHIRO
Keyword(s):  
Solid State ◽  
Thermal Behavior ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Trivalent Lanthanides ◽  
Air Atmosphere ◽  
Behavior Study ◽  
Derivative Thermogravimetry ◽  
Co2 Atmosphere

Solid state cinnamylidenepyruvate of trivalent lanthanides (except for promethium) and yttrium, were 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 behavior of these compounds in a dynamic CO2 atmosphere. The results obtained showed significative differences on the thermal stability and thermal decomposition of these compounds, with regard to the thermal behavior study in a dynamic air atmosphere.

scholarly journals Thermal behavior studies of solid state compounds of 4-dimethylaminocinnamylidenepyruvate with alkali earth metals, except beryllium and radium

2000 ◽  
Vol 25 (0) ◽  
pp. 31-39 ◽  
Author(s):  
Egon SCHNITZLER ◽  
Wilson COSTA ◽  
Cristo Bladimiros MELIOS ◽  
Maria Ines Gonçalves LELES ◽  
Massao IONASHIRO
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Solid State ◽  
Thermal Behavior ◽  
General Formula ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Alkali Earth ◽  
Derivative Thermogravimetry

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.

scholarly journals Thermoanalytical study of the complexes of 4-dimetilaminocinnamylidenepiruvate with manganese (II), cobalt (II), nickel (II), cupper (II), zinc (II) and lead (II), in the solid state

2002 ◽  
Vol 27 (0) ◽  
Author(s):  
Egon SCHNITZLER ◽  
Márcio LAZZAROTTO ◽  
Marco Aurelio da Silva CARVALHO-FILHO ◽  
Massao IONASHIRO
Keyword(s):  
Solid State ◽  
X Ray Diffraction ◽  
Hydration Degree ◽  
Scanning Calorimetry ◽  
Thermoanalytical Study ◽  
Complexometric Titration ◽  
X Ray ◽  
Dsc Curves ◽  
Derivative Thermogravimetry ◽  
Thermal Stability Of

Solid state compounds M-4-DMCP, where 4-DMCP is 4-dimethylaminocinnamylidenepyruvate and M represents Mn (II), Co (II), Ni (II), Cu (II), Zn (II) and Pb (II) were prepared. These compounds were studied by thermoanalitycal techniques: thermogravimetry (TG), derivative thermogravimetry (DTG), differential scanning calorimetry (DSC), X-ray diffraction powder patterns and complexometric titration with EDTA. From the results obtained by the complexometric titration with EDTA, TG, DTG and DSC curves, was possible to establish the hydration degree, stoichiometry and thermal stability of the prepared compounds.

scholarly journals Thermal behaviour study of solid state compounds of manganese (II), zinc (II) and lead (II) with cinnamic acid

1998 ◽  
Vol 23 (0) ◽  
pp. 09-16
Author(s):  
Marco Aurélio da Silva CARVALHO FILHO ◽  
Massao IONASHIRO
Keyword(s):  
Thermal Stability ◽  
Aqueous Solution ◽  
Differential Scanning Calorimetry ◽  
Cinnamic Acid ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Manganese Zinc ◽  
Behaviour Study ◽  
Derivative Thermogravimetry

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.

scholarly journals Formation of metal oxide-based hydroxysodalite by alkali-activation of kaolinite

Chemija ◽  
2020 ◽  
Vol 31 (3) ◽  
Author(s):  
Ehab AlShamaileh ◽  
Muayad Esaifan ◽  
Qusay Abu-Afifeh
Keyword(s):  
Activation Energy ◽  
Metal Oxide ◽  
Alkali Activation ◽  
Dsc Analysis ◽  
X Ray Diffraction ◽  
Heating Rates ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Xrd Study ◽  
Dsc Curves

The formation of metal oxide-based hydroxysodalite by alkali-activation of kaolinite is studied using X-ray diffraction (XRD) study and differential scanning calorimetry (DSC) analysis. Different metal oxides (CoO, MgO, FeO and SiO2) were used to form the metal oxide-based hydroxysodalite. The transformation from kaolinite into hydroxysodalite is confirmed by XRD. In the thermodynamic study, the maximum peak temperatures for DSC curves at various heating rates were used to determine the activation energy (Ea) of the hydroxysodalite formation. With magnesium oxide and cobalt oxide, the formation process was found to be exothermic while it was endothermic with iron oxide.

Obtaining Heat-Resistant Materials with the Use of Silica Nanoparticles

2016 ◽  
Vol 683 ◽  
pp. 150-155
Author(s):  
Viktor A. Vlasov ◽  
Pavel V. Kosmachev ◽  
Nelli K. Skripnikova ◽  
Vladimir Otmahov ◽  
Konstantin Bezukhov
Keyword(s):  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Heat Resistant ◽  
Zirconium Silicate ◽  
Tomsk Region ◽  
Zirconium Compounds ◽  
White Clay ◽  
Mass Form ◽  
Derivative Thermogravimetry

Heat-resistant materials are commonly used in industry where technological processes require high temperatures. The research represents possibility to obtain Al2O3–SiO2–ZrO2 based composition from local raw like zirconium silicate of Tugansk deposit of Tomsk region and white clay of Kailinsk deposit of Kemerovo region in Russia. There is possible application in gunning-mass form for restoration industrial thermal units. X-ray Diffraction Analysis demonstrates that mullite and zirconium compounds are formed in samples content after firing. The infra-red spectrums of heat-resistant gunning masses samples have been described by Fourier Transform Infrared Spectroscopy method. The thermal analysis has been performed using Differential Scanning Calorimetry and Derivative Thermogravimetry.

scholarly journals Preparation and thermal decomposition of solid state cinnamates of alkali earth metals, except beryllium and radium

1998 ◽  
Vol 23 (0) ◽  
pp. 91-98 ◽  
Author(s):  
Ana Glauce ZAINA CHIARETTO ◽  
Marco Aurélio da Silva CARVALHO FILHO ◽  
Nedja Suely FERNANDES ◽  
Massao IONASHIRO
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Solid State ◽  
General Formula ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Preparation And Thermal Decomposition ◽  
Derivative Thermogravimetry

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.

scholarly journals Synthesis, characterization and thermal behaviour on solid pyruvates of light trivalent lanthanides

2007 ◽  
Vol 32 (4) ◽  
pp. 49-54 ◽  
Author(s):  
A. B. Siqueira ◽  
C. T. de Carvalho ◽  
E. C. Rodrigues ◽  
E. Y. Ionashiro ◽  
G. Bannach ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Infrared Spectroscopy ◽  
Solid State ◽  
Thermal Behaviour ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Trivalent Lanthanides ◽  
Light Trivalent Lanthanides ◽  
Derivative Thermogravimetry

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.

scholarly journals Synthesis, characterization and thermal behaviour on solid pyruvates of some bivalent metal ions.

2018 ◽  
Vol 34 (2) ◽  
pp. 15
Author(s):  
Adriano Buzutti De Siqueira ◽  
Cláudio Teodoro De Carvalho ◽  
Elias Yuki Ionashiro ◽  
Massao Ionashiro
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Infrared Spectroscopy ◽  
Solid State ◽  
Thermal Behaviour ◽  
Scanning Calorimetry ◽  
Bivalent Metal ◽  
X Ray ◽  
Bivalent Metal Ions ◽  
Derivative Thermogravimetry

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.

Room Temperature Synthesis of Cu2O Nanospheres: Optical Properties and Thermal Behavior

2014 ◽  
Vol 21 (1) ◽  
pp. 108-119 ◽  
Author(s):  
Daniela Nunes ◽  
Lídia Santos ◽  
Paulo Duarte ◽  
Ana Pimentel ◽  
Joana V. Pinto ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Thermal Behavior ◽  
Room Temperature ◽  
Diffuse Reflectance Spectroscopy ◽  
Ion Beam ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron

AbstractThe present work reports a simple and easy wet chemistry synthesis of cuprous oxide (Cu2O) nanospheres at room temperature without surfactants and using different precursors. Structural characterization was carried out by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy coupled with focused ion beam and energy-dispersive X-ray spectroscopy. The optical band gaps were determined from diffuse reflectance spectroscopy. The photoluminescence behavior of the as-synthesized nanospheres showed significant differences depending on the precursors used. The Cu2O nanospheres were constituted by aggregates of nanocrystals, in which an on/off emission behavior of each individual nanocrystal was identified during transmission electron microscopy observations. The thermal behavior of the Cu2O nanospheres was investigated with in situ X-ray diffraction and differential scanning calorimetry experiments. Remarkable structural differences were observed for the nanospheres annealed in air, which turned into hollow spherical structures surrounded by outsized nanocrystals.

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