Laboratory thermogravimetric analyzerThe principle and application are as follows:

1、 Principle

Thermal Gravimetric Analyzer (TGA) is an instrument that uses thermogravimetric analysis to detect the temperature mass relationship of substances. Thermogravimetric analysis is a method of measuring the mass of a substance as a function of temperature (or time) under programmed temperature control. When the measured substance undergoes phenomena such as sublimation, vaporization, gas decomposition, or loss of crystal water during the heating process, the mass of the measured substance will change, and the thermogravimetric curve will not be a straight line but rather decrease. By analyzing the thermogravimetric curve, it is possible to determine the temperature at which the measured substance undergoes a change, and based on the weight loss, the amount of substance lost (such as crystal water in CuSO4 · 5H2O) can be calculated.

　　Laboratory thermogravimetric analyzerThere are two measurement principles, namely displacement method and zero position method:

Displacement method: Based on the proportional relationship between the inclination of the balance beam and the change in mass, the inclination is detected using differential transformers and automatically recorded.

Zero position method: Differential transformer method and optical method are used to determine the inclination of the balance beam, and then the current of the coil installed in the balance system and magnetic field is adjusted to restore the inclination of the balance beam by rotating the coil. Since the force exerted by the rotation of the coil is proportional to the change in mass, and this force is proportional to the current in the coil, it is only necessary to measure and record the change in current to obtain the curve of mass change.

2、 Application

Thermogravimetric analyzer has a wide range of application fields, especially in materials science, chemical engineering, environmental science, and industrial production. Here are some specific applications of thermogravimetric analyzers:

Measurement of Metal Gas Reaction: The reaction between metal and gas is a gas-solid phase reaction, which can be determined by thermogravimetric analysis to determine the relationship between the mass change and temperature during the reaction process, and can be used for kinetic analysis of the reaction quantity.

Geological applications: The thermogravimetric curves of minerals exhibit different characteristics due to their composition and structure. By comparing the starting temperature, peak temperature, and peak area with known mineral characteristic curves, minerals can be identified.

Applications in polymer materials: Thermogravimetric analysis can evaluate the thermal stability of polyolefin, polyhalogenated alkene, oxygen-containing polymer, aromatic heterocyclic polymer, monomer, polymer, and elastomeric polymer materials.

Application in environmental monitoring: It can measure various changes in the environment, such as dehydration, decomposition, and degradation of waste. Combining with other technologies to determine the total amount of carbon element and soluble and insoluble organic matter in suspended particles in the air.

Application in pharmaceuticals: Thermogravimetric analysis can be used to determine the melting point, boiling point, and purity of drugs.

Application of Thermogravimetric Analysis in Combination with Other Methods: Thermogravimetric analysis is more widely used in combination with other non thermal analysis methods. For example, combining a thermogravimetric analyzer with a mass spectrometer or infrared spectrometer can enable online analysis of the properties of gases produced during temperature changes and characterize the types of substances.

　　Laboratory thermogravimetric analyzerAs an important thermal analysis instrument, it plays a crucial role in multiple fields. By accurately analyzing the thermal stability, phase transition, decomposition and other processes of materials, thermogravimetric analyzers provide strong support for revealing material properties and optimizing application solutions.