2023年1月24日 · Integrating a peak in DSC or DTA to determine its its area, A A, gives a signal that is proportional to ΔH Δ H. where the calibration constant, k k, is determined using an established reference material. Both DSC and DTA find applications in the study of polymers, liquid crystals, and pharmaceutical compounds.

Differential thermal analysis (DTA) is a thermoanalytic technique that is similar to differential scanning calorimetry. In DTA, the material under study and an inert reference are made to undergo identical thermal cycles, (i.e., same cooling or heating programme) while recording any temperature difference between sample and reference. [ 1 ]

By convention, endothermic response is represented by downward peaks whereas exothermic response is shown by upward peaks. Curve obtained from DTA can be used for identification purposes as a fingerprint of material.

The “DTA” refers to differential thermal analysis. The DTA technique measures the difference between the sample temperature (T s) and the temperature of a reference (T r). A plot of T s – T R over a programmed temperature range will show a series of peaks or step changes that map the temperatures where thermal events occur. However, the ...

2024年7月23日 · Draw and interpret DTA thermogram. Compare and contrast TG and DTA results. Explain the applications of DTA and simultaneous TG-DTA analysis.

1994年12月12日 · Through curves simulated (calculated) as previously reported, DSC/DTA/DTG peak shapes are discussed in terms of six parameters: height, position, left and right half width at half maximum, and also as left and right gaussian/lorentzian mixing ratio.

2022年8月30日 · Differential thermal analysis, also known as DTA is a type of thermal analysis that involves the measurement of the temperature difference between a substance and a reference material as a function of temperature while the substance and reference are subjected to a controlled temperature program.

2024年6月19日 · DTA is instrumental in studying the thermal behavior of inorganic species by analyzing the differential thermograms obtained during heating. By observing the peaks and minima in the DTA curve, one can identify processes like conversion, decomposition, and oxidation of inorganic compounds.

Inferences from DTA plot • Any chemical or physical change that results in a change in ∆H gives a peak in the DTA thermal curve. • There are some types of changes that do not result in a peak in the thermal curve but only a change in the baseline. These types of changes do not undergo a change in ∆H, but a change in their heat capacity, Cp.

Peak temperature is affected by heating rate & sample mass, but not by ∆h (enthalpy) and T onset. Raw materials should be of high purity. Fine -grained powder should be used to achieve greater contact area and better equilibrium conditions. The time at any temperature must be sufficiently long in order to permit completeness of reactions.