Difference Between Tga And Dta Pdf
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- Thermogravimetric Analysis (TGA)
- Difference Between TGA DTA and DSC
- Thermal analysis: basics, applications, and benefit
Thermogravimetric analysis or thermal gravimetric analysis TGA is a method of thermal analysis in which the mass of a sample is measured over time as the temperature changes. This measurement provides information about physical phenomena, such as phase transitions , absorption , adsorption and desorption ; as well as chemical phenomena including chemisorptions , thermal decomposition , and solid-gas reactions e.
According to DIN 51 , differential thermal analysis DTA is suited for the determination of characteristic temperatures, while differential scanning calorimetry DSC additionally allows for the determination of caloric values such as the heat of fusion or heat of crystallization. This can be done with two different measuring techniques: heat-flux differential scanning calorimetry or power-compensated differential scanning calorimetry. For DSC, this temperature difference can be converted into a heat-flux difference in mW by means of an appropriate calibration. This possibility does not exist for a purely DTA instrument.
Thermogravimetric Analysis (TGA)
Hitachi Group Corporate Information. A technique in which the difference in temperature between the sample and a reference material is monitored against time or temperature while the temperature of the sample, in a specified atmosphere, is programmed.
Figure 1. Block diagram of DTA. Figure 1 shows the block diagram of DTA. The sample and the reference are placed symmetrically in the furnace. The furnace is controlled under a temperature program and the temperature of the sample and the reference are changed. During this process, a differential thermocouple is set up to detect the temperature difference between the sample and the reference. Also, the sample temperature is detected from the thermocouple on the sample side.
Figure 2 Measurement principles of DTA. Graph a shows the temperature change of the furnace, the reference and the sample against time. When the furnace heating begins, the reference and the sample begin heating with a slight delay depending on their respective heat capacity, and eventually heat up in according to the furnace temperature.
The signal at the static state is known as the baseline. When the melting ends, the temperature curve rapidly reverts to the baseline. In graph b , the temperature difference due to the samplefs endothermic change is shown as a negative direction and the temperature difference due to the samplefs exothermic change is shown as a positive direction.
Definitions of Differential Thermal Analysis DTA A technique in which the difference in temperature between the sample and a reference material is monitored against time or temperature while the temperature of the sample, in a specified atmosphere, is programmed.
Description of DTA Figure 1. Figure 2 Measurement principles of DTA Graph a shows the temperature change of the furnace, the reference and the sample against time. Contact Us. All rights reserved.
Difference Between TGA DTA and DSC
TGA, DTA, and DSC are three terms used to describe the analysis of compounds that take part in chemical reactions using changes in temperature of these compounds. All these three techniques are types of thermal analysis. In TGA, the change in mass of the sample is measured with the increasing temperature while, in DTA, the temperature difference that builds up between the sample and a reference is measured and in DSC, the heat released during a chemical process is measured. It is a thermal analysis technique. Here, the change of the mass of a sample is observed and analyzed with the change of the temperature. This can also be measured as a function of time at a constant temperature. This method is commonly used for the analysis of sample purity, carbonate and organic matter content in the sample, etc.
Thermogravimetric analysis TGA measures weight changes in a material as a function of temperature or time under a controlled atmosphere. Typical applications include:. A TGA analysis is performed by gradually raising the temperature of a sample in a furnace as its weight is measured on an analytical balance that remains outside of the furnace. In TGA, mass loss is observed if a thermal event involves loss of a volatile component. Chemical reactions, such as combustion, involve mass losses, whereas physical changes, such as melting, do not. The weight of the sample is plotted against temperature or time to illustrate thermal transitions in the material — such as loss of solvent and plasticizers in polymers, water of hydration in inorganic materials, and, finally, decomposition of the material. Typical applications include: Filler content of polymer resins Residual solvent content Carbon black content Decomposition temperature Moisture content of organic and inorganic materials Plasticizer content of polymers Oxidative stability Performance of stabilizers Low molecular weight monomers in polymers Principle of Operation A TGA analysis is performed by gradually raising the temperature of a sample in a furnace as its weight is measured on an analytical balance that remains outside of the furnace.
Thermal analysis: basics, applications, and benefit
Thermogravimetric analysis TGA and the associated differential thermal analysis DTA are widely used for the characterization of both as-synthesized and side-wall functionalized single walled carbon nanotubes SWNTs. Under oxygen, SWNTs will pyrolyze leaving any inorganic residue behind. Quantitative determination of these properties are used to define the purity of SWNTs, and the extent of their functionalization. The main function of TGA is the monitoring of the thermal stability of a material by recording the change in mass of the sample with respect to temperature. Inside the TGA, there are two pans, a reference pan and a sample pan.