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1.
Jeanina Pandele Cusu Adina Magdalena Musuc Mihaela Matache Dumitru Oancea 《Journal of Thermal Analysis and Calorimetry》2012,110(3):1259-1266
In this study, the thermal stability and exothermal decomposition of some ketone-2,4-dinitrophenylhydrazones have investigated using the DSC technique. The synthesized and purified crystalline solids are thermally stable and start to decompose after melting. Non-isothermal DSC curves, recorded at several heating rates, were used to evaluate the melting properties and the kinetics of thermal decomposition. The isoconversional and model-fitting methods were applied to determine the activation parameters from the common analysis of multiple curves measured at different heating rates. Based on the results of the model??free method, a kinetic model was derived, and the kinetic parameters were obtained by means of a multivariate nonlinear regression. The results are discussed in relation to the effect of the ketone structure. 相似文献
2.
Musuc Adina Magdalena Patrinoiu Greta Budrugeac Petru Cucos Andrei Dascalu Radu Calderon-Moreno Jose Carp Oana 《Journal of Thermal Analysis and Calorimetry》2022,147(22):12805-12814
Journal of Thermal Analysis and Calorimetry - The combustion behavior of fructose-derived hydrochar was investigated using a kinetic evaluation protocol that brings about novel elements related to... 相似文献
3.
Adina Magdalena Musuc Domnina Razus Dumitru Oancea 《Journal of Thermal Analysis and Calorimetry》2009,98(3):779-784
The thermal decomposition of new N-methoxy-polynitroanilines was studied using the differential scanning calorimetry (DSC) method. The characteristic melting
parameters were measured and the activation parameters of the most probable kinetic models of thermal decomposition were determined
using a multivariate non-linear regression method. All investigated compounds followed an autocatalytic decomposition mechanism.
Depending on the number and position of substituents on the aromatic ring the thermal decomposition occurs in one, two or
three steps. 相似文献
4.
Adina Magdalena Musuc Domnina Razus D. Oancea 《Journal of Thermal Analysis and Calorimetry》2007,90(3):807-812
Kinetics of exothermal decomposition of 2-nitrophenylhydrazine (2-NPH) and 4-nitrophenylhydrazine (4-NPH) was investigated
by differential scanning calorimetry. The isoconversional methods, Friedman and Flynn-Wall-Ozawa, were applied to determine
the activation parameters from the common analysis of multiple curves measured at different heating rates. For the processes
involving two-step reactions the multivariate non-linear regression was used. A good agreement between the experimental and
the fitted data was found. 相似文献
5.
Mariana Loredana Dianu Angela Kriza Adina Magdalena Musuc 《Journal of Thermal Analysis and Calorimetry》2013,112(2):585-593
A bidentate/tridentate 5-bromosalycilaldehyde isonicotinoylhydrazone Schiff base was synthesized by condensing 5-bromosalycilaldehyde with isonicotinoylhydrazine. Cu(II), Co(II), Ni(II), Mn(II) and Zn(II) complexes of this chelating ligand were synthesized using nitrates of these metals. The ligand and the complexes were characterized by elemental analysis, UV–Vis, IR and EPR spectroscopy, conductance and magnetic susceptibility measurements, fluorescence, cyclic voltammetry and thermogravimetric analysis. The ligand and Zn(II) complex exhibits solid-state photoluminescence at room temperature. 相似文献
6.
Lucica Viorica Ababei Angela Kriza Cristian Andronescu Adina Magdalena Musuc 《Journal of Thermal Analysis and Calorimetry》2012,107(2):573-584
Ten new mononuclear complexes having general formulae [ML2](ClO4)2, M = Cu(II), Co(II), Ni(II), Mn(II) and Zn(II), [ML2](SO4), M = Co(II), Ni(II) and [ML2(H2O)2](SO4), M = Cu(II), Mn(II) and Zn(II), L = 2-acetyl-pyridyl-isonicotinoylhydrazone have been synthesized and characterized based
on elemental analyses, IR spectroscopy, UV–Vis–NIR, EPR, as well as thermal analysis and determination of molar conductivity
and magnetic moments. The structures of [CoL2](ClO4)2 are accomplished by single crystal X-ray diffraction. The coordination sphere is formed by two N, N, O tridentates 2-acetyl-pyridyl-isonicotinoylhydrazone
ligands, or by two N, O bidentate 2-acetyl-pyridyl-isonicotinoylhydrazone and two water molecules. Biological activity studies
reveal a moderate activity of complexes against gram-negative and gram-positive bacteria. 相似文献
7.
Jeanina Pandele Cusu Adina Magdalena Musuc Dumitru Oancea 《Journal of Thermal Analysis and Calorimetry》2012,109(1):123-129
The thermal stability of some benzaldehyde 2,4-dinitrophenylhydrazones has been studied using DSC technique. The crystalline solids are thermally stable and start to decompose after melting. Non-isothermal DSC curves, recorded at several heating rates, were used to evaluate the melting properties and the kinetics of thermal decomposition. Both isoconversional and model fitting methods were used for the evaluation of the kinetic parameters. Based on the results of the model free method, a kinetic model was derived and the kinetic parameters were obtained by means of a multivariate non-linear regression. A good agreement between the experimental and fitted data was found. 相似文献
8.
Differential scanning calorimetry was used to study the thermal decomposition of 2,4-dinitrophenylhydrazine (DNPH) in isothermal regime. The DSC curves were carried out at several constant temperatures lower than the melting temperature. The standard isoconversional analysis of the obtained curves suggests an autocatalytic decomposition mechanism. This mechanism is also supported by the temperature dependence of the observed induction periods. 相似文献
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10.
Jeanina Pandele Cusu Adina Magdalena Musuc Dumitru Oancea 《Journal of Thermal Analysis and Calorimetry》2012,109(1):255-263
A kinetic study on the thermal decomposition of 3-nitro and 4-nitro-benzaldehyde-2,4-dinitrophenylhydrazones was carried out. The isothermal and dynamic differential scanning calorimetric curves were recorded for solids and melts, respectively. The standard isoconversional analysis of the obtained curves from both isothermal and nonisothermal analysis suggests an autocatalytic decomposition mechanism. This mechanism is also supported by the temperature dependence of the observed induction periods. Based on the results of the model-free method from nonisothermal regime, the kinetic model was derived and the kinetic parameters were obtained by means of a multivariate nonlinear regression. 相似文献