Authors:Yu Huimei, Qi Lingjun, Zhang Qinghong, Jiang Danyu, and Lu Changwei
The thermal behavior of the anticancer drug-irinotecan was measured by Thermogravimetry–Differential thermal analysis (TG–DTA) to explore the application of TG–DTA in nanomedicine firstly. The TG–DTA result showed that the irinotecan was oxidized completely before 700 °C. When irinotecan was loaded onto nanosized mesoporous silica spheres, the loading capacity for irinotecan measured by TG–DTA was about 9.11% in the irinotecan/mesoporous SiO2 composite, similar to the typical UV–Vis spectra results (10.5%), which showed that TG–DTA characterization provided an alternative method to determine the drug loading amount on inorganic carriers. Secondly, Thermogravimetry–Differential scanning calorimetry–Mass Spectrometry coupling techniques (TG–DSC–MS) were used to characterize the hydrogen adsorption temperature and capacity of TiCr1.2 (V-Fe)0.6 alloy. The MS result showed that the released region of hydrogen was 250–500 °C, which was consistent with the TG–DSC results. Lastly, TA–MS combined with pulse thermal analysis (PulseTA) were used for a simultaneous characterizing study in the changes of mass, determination and quantitative calibration of the evolved nitrogen formed during the thermal decomposition of the InN powder. The results showed that relative error of this method between measured value and theoretical value was 2.67% for the quantitative calibration of evolved N2. It shows that TA–MS combined with PulseTA techniques offer a good tool for the quantification of the evolved nitrogen in the InN powder.
Authors:S. Mojumdar, M. Sain, R. Prasad, L. Sun, and J. Venart
There are many thermoanalytical techniques but only several of them such as thermogravimetric analysis (TG), high resolution
thermogravimetric analysis (Hi-Res™ TG), derivative thermogravimetry (DTG), differential thermal analysis (DTA), calorimetry,
differential scanning calorimetry (DSC), modulated differential scanning calorimetry (MDSC), evolved gas analysis (EGA), transient
thermal analysis (TTA) and thermal conductivity (k) have selected to be discussed in this paper. Simultaneous thermal analysis (STA) is ideal for investigating issues such
as the glass transition of modified glasses, binder burnout, dehydration of ceramic materials or decomposition behaviour of
inorganic building materials, also with gas analysis. Selected applications of various thermoanalytical techniques from medicine
to construction have also been discussed in this paper.
Immobilization of lead contamination in soils by precipitation of non-assimilable for plants Pb-phosphate was considered.
Glassy fertilizer of controlled release rate of the nutrients for plants as a source of phosphate anions was applied. Thermal
analysis methods (TG/DTG/DTA) were used for the identification of components of Pb-precipitate, which being in statu nascendi have nonstoichiometric composition and disordered crystallographic structure difficult to identify by XRD method. Application
of TA methods permits to demonstrate the negative role of Pb complexing citric acid solution simulating the natural soil conditions,
which inhibits the Pb-phosphate of pyromorphite type formation.
Four computer programs as well as one demo-version for non-linear evaluation of kinetic data in thermal analysis and calorimetry, were presented. The multi-task program TA-kin meets all mathematical requirements for solving the numerical assignments. It is shown that the so-called compensation effect is due to the mathematical structure of the Arrhenius equation. Several applications of TA-kin to a lot of DSC- and TG-measurements and isoperibolic batch experiments as well as adiabatic semi batch experiments realized by precision calorimetry have been discussed.
Thermoanalytical (TA) methods are relatively seldom applied for assessing the physical and chemical proeprties of thin films,
but they can be used in studies of composition, phase transitions and film—substrate interactions. In the present paper the
possibilities of TA methods in thin film studies are reviewed. The thermoanalytical methods considered are the classical TG
and DTA/DSC methods but some complementary methods will also be briefly mentioned. The main emphasis is given to true thin
films. Details of sample preparation are also given. An important application of TA methods is characterization of precursors
for the CVD growth of thin films, and this is also discussed.
University’s report, “Reinventing Undergraduate Education: A Blueprint for America’s Research Universities” in 1998 [ 7 ], there has been a national emphasis on providing undergraduate research opportunities. Given the wide applicationofTA across academic