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Ledeti Ionut Pusztai Agneta Maria Murariu Marius Olariu Sorin Ivan Codrut Circioban Denisa Vlase Gabriela Ledeti Adriana Vlase Titus Matusz Petru 《Journal of Thermal Analysis and Calorimetry》2018,131(2):1345-1360
Journal of Thermal Analysis and Calorimetry - In this work, solifenacin succinate (SOLS), flavoxate HCl (FLXHC) and tolterodine tartrate (TOLT) drugs were investigated using thermal analysis (TA)... 相似文献
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T. Vlase C. Pǎcurariu R. I. Lazǎu I. Lazǎn 《Journal of Thermal Analysis and Calorimetry》2007,88(3):625-629
The crystallization kinetic of the basalt glass ceramic of the oxide composition, (%): SiO2 − 50.82; Al2O3 − 12.05; Fe2O3 − 9.28; CaO − 15.48; MgO − 11.08; Na2O+K2O − 1.14; TiO2 − 0.15, with addition of 10% TiO2 as nucleating agent has been studied using thermal analysis under non-isothermal conditions.
In this order, the non-isothermal DTA curves were obtained at different heating rates between 4 and 20°C min−1 in the temperature range of 25–1000°C using a Derivatograph-C (MOM, Hungary). The kinetic parameters of the crystallization
process were calculated on the basis of Ozawa-Flynn-Wall, Friedman, Budrugeac-Segal and non-parametric kinetic methods. 相似文献
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Cîrcioban Denisa Ledeţi Adriana Vlase Gabriela Ledeţi Ionuţ Vlase Titus Văruț Renata Pavel Ioana Zinuca Dehelean Cristina 《Journal of Thermal Analysis and Calorimetry》2020,141(3):1041-1051
Journal of Thermal Analysis and Calorimetry - The use of cyclodextrins as carrier molecules is currently highly researched since they can improve not only the apparent water solubility and... 相似文献
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Alexandra Ioiţescu Gabriela Vlase T. Vlase G. Ilia N. Doca 《Journal of Thermal Analysis and Calorimetry》2009,96(3):937-942
The synthesis of four types of hydroxyapatite synthesized from calcium chloride and four different organic phosphites is presented.
The method of synthesis chosen is the sol–gel route, which has a number of advantages compared to other methods, like the
intimate contact between reactants and the milder synthesis conditions. The samples were thermally treated, the TG/DTG/DTA
curves being obtained at four heating rates, namely: 7, 10, 12 and 15 °C min−1. The samples were characterized before and after the thermal treatment using FT-IR analysis. The FT-IR spectra certified
that the formed compounds represent hydroxyapatite. Based on the information from the TG curves and IR spectra interpretation,
a reaction mechanism was proposed. 相似文献
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C. P?curariu R. I. Laz?u I. Laz?u R. Iano? T. Vlase 《Journal of Thermal Analysis and Calorimetry》2009,97(2):409-414
The influence of the specific surface area on the crystallization processes of two silica gels with different specific surface
areas has been investigated in non-isothermal conditions using DTA technique. The activation energies of the crystallization
processes were calculated using four isoconversional methods: Ozawa-Flynn-Wall, Kissinger-Akahira-Sunose, Starink and Tang.
It has been established that, the decrease of the surface area from S=252.62 m2 g−1, in the case of sample GS2, to S=2.52 m2 g−1, in the case of sample GS1, has determined a slight increase of the activation energy of the crystallization process of the
gels. Regardless of the isoconversional method used, the activation energy (E
α) decreases monotonously with the crystallized fraction (α), which confirms the complex mechanism of gels crystallization.
It has been proved that the Johnson-Mehl-Avrami model cannot be applied for the crystallization processes of the studied silica
gels. 相似文献
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The thermal decompositions of ammonium metavanadate, molybdic acid and ammonium phosphomolybdate supported on carborundum
or silica were subjected to non-isothermal kinetic study. The compensation effect is discussed in connection with the quantitative
estimation of the support effect.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献