Thermogravimetric Analyser (TGA) & Differential Scanning Calorimetry (DSC) Methods

Purpose of DSC Analysis

• Differential Scanning Calorimetry (DSC) is utilized to measure thermal properties of materials, particularly heat flow associated with phase transitions and chemical reactions.

TG Curve and Thermobalance

• The shape of the Thermogravimetric (TG) curve is influenced by the design and calibration of the thermobalance used for the analysis.

Heat Transfer Disk in DSC

• The heat transfer disk in DSC serves to ensure efficient thermal exchange between the sample and reference materials, allowing for precise temperature control during measurements.

Constant Temperature DSC Method

• Isothermal DSC method maintains equal temperatures for both sample and reference, analyzing their heat interactions over time.

Non-Applicable Reactions in TG Analysis

• TG analysis does not measure reactions that do not involve mass change, such as simple physical transitions that are not associated with weight loss or gain.

Relationship in Heating

• When a body is heated, the relationship is defined by the equation: ΔQ = mCΔT, where ΔQ is heat absorbed, m is mass, C is heat capacity, and ΔT is the temperature increase.

Measurements by Thermal Analysis

• Thermal analysis methods gauge physical and chemical properties of materials as they undergo changes in temperature.

TGA Property Measurement

• In Thermogravimetric Analysis (TGA), the mass of the sample is recorded as a function of temperature or time to observe weight changes during thermal events.

Principle of DSC

• Differential Scanning Calorimetry (DSC) operates on the principle of measuring the difference in heat flow to a sample and a reference as they are subjected to controlled temperature changes.

Definition of Heat Capacity

• Heat capacity characterizes the amount of heat energy required to change the temperature of a unit mass of a substance by one degree Celsius (or Kelvin).

Learn about thermal analysis methods that measure the dynamic relationship between temperature and properties of a system. Understand the principles of heat absorption and mass changes in response to temperature variations.