DSC vs TGA analysis

DSC (Differential Scanning Calorimetry)

DSC measures the heat flow to and from a sample as the temperature changes. It is used to determine the energy absorbed or released during thermal.transitions such as melting, crystallization, and glass transitions

Figure 1: METTLER TOLEDO DSC1

TGA (Thermogravimetric Analysis):

TGA measures the change in mass of a sample as it is heated or cooled. It is particularly useful for studying thermal decomposition, moisture content, and compositional analysis.

Figure 2: Classification of the different observable TGA Curves.

Figure from Physical Methods in Chemistry and Nanoscience by Pavan M.V. Raja and Andrew R. Barron

1. Temperature Range:

DSC: Typically operates from -170°C to 600°C.

TGA: Typically operates from room temperature to 1,000°C.

2.Primary Determination:

DSC: Measures changes in heat flow, providing data on transition temperatures and enthalpies.

TGA: Measures changes in mass, providing data on mass loss or gain and residual mass.

3. Applications:

DSC: Used for studying phase transitions, glass transitions, and specific heat capacity.

Figure 3: DSC scanning curve for phase transition observation in Cu-40 wt.% Zn alloy (blue line) and Cu-40 wt.% Zn/10 vol.% WC nanocomposite (red line) under N 2 protection

https://www.researchgate.net/publication/334017108_Enhanced_thermal_stability_in_Cu-40_wt_ZnWC_nanocomposite

• Melting/Crystallization: Understanding the melting and crystallization behavior of polymers and other materials.
• Phase Transitions: Identifying solid-phase transitions which are crucial for materials science research.
• Glass Transition: Determining the glass transition temperature of polymers.
• Oxidation Resistance: Evaluating the oxidative stability of materials.

TGA: Used for analyzing thermal stability, decomposition, and compositional analysis

Figure 4: Applications of TGA

https://www.youtube.com/watch?v=957Ay8r1F04

• Mass Change Study: Analyzing mass changes due to decomposition or oxidation/reduction reactions.

• Composition Analysis: Determining the composition of multi-component materials by observing distinct weight loss steps.

• Thermal Stability: Assessing the thermal stability of various materials under different atmospheres.

• Decomposition Kinetics: Evaluating the kinetics of decomposition reactions

4. Combined Use:

Using DSC and TGA together can provide comprehensive thermal analysis, identifying both the type of reaction and the associated mass changes

5. Output:

DSC: Provides data on transition temperatures and enthalpies.

TGA: Provides data on mass changes and residual mass.