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Thermogravimetric Analyzer - Focus on Microfluidic Control Technology

The Thermal Gravimetric Analyzer is an instrument that uses the thermogravimetric method to detect temperature-mass changes in a substance. Thermogravimetry is the relationship between the mass of a measured substance and the temperature (or time) under temperature control of the process.
When the substance to be tested sublimes, vaporizes, decomposes, or loses crystal water during heating, the mass of the material being measured changes. At this time, the thermo-gravity curve is not a straight line but it has dropped. By analyzing the thermogravimetric curves, it is possible to know how much the measured substance is changing, and based on the lost weight, how much material is lost (such as crystal water in CuSO4·5H2O) can be calculated. From the thermogravimetric curve, we can know that the five crystal waters in CuSO4·5H2O are removed in three steps. The TGA experiment helps to study the changes of crystal properties, such as the physical phenomena of melting, evaporation, sublimation and adsorption; it also helps to study the chemical phenomena of substances such as dehydration, dissociation, oxidation, and reduction. Thermogravimetric analysis can generally be divided into two categories: dynamic (heat up) and static (constant temperature). The curve obtained by the thermogravimetry test is called the thermogravimetric curve (TG curve). The TG curve uses the mass as the ordinate, showing the mass reduction from top to bottom; the temperature (or time) as the abscissa, and the temperature from left to right ( Or time) increase.
The thermogravimetric analyzer is mainly composed of several parts such as a balance, a furnace, a program temperature control system, and a recording system.
There are two principles of measurement commonly used in zui, namely the displacement method and zero method. The so-called displacement method is based on the proportional relationship between the inclination of the balance beam and the quality change, and the differential transformer is used to detect the inclination and record it automatically. The zero method uses the differential transformer method and the optical method to determine the tilt of the balance beam, and then adjusts the current installed in the balance system and the coil in the magnetic field so that the rotation of the coil restores the tilt of the balance beam, the so-called zero method. Since the force exerted by the rotation of the coil is proportional to the mass change, which is in turn proportional to the current in the coil, it is only necessary to measure and record the change in current to obtain a curve of the mass change.

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