Shanghai Jituo Tech provides TGA thermogravimetric analysis and testing services

• Core working principle
• • The core of TGA is a high-precision thermobalance. When the sample is heated in the furnace, reactions such as oxidation, decomposition, desorption, or volatilization occur, leading to mass changes. The sensor captures these small mass fluctuations and correlates them with temperature or time.
• • Balance system: Typically employing the electromagnetic compensation balance principle, it can achieve an accuracy level of micrograms (μg).
• • Heating furnace: It must possess excellent temperature control linearity and a uniform temperature zone.
• • Atmosphere control: Common atmospheres include inert gases (N2, Ar) for thermal degradation studies, and oxidizing gases (air, O2) for oxidation stability studies.
• In-depth Analysis of TGA Curve
• A complete TGA report typically includes two curves: the TG curve (mass percentage) and the DTG curve (differential thermogravimetric analysis).
• TG curve (Thermogravimetry) Display the absolute value or percentage of the change in sample quality with temperature.
• • Plateau period: It represents that the material is in a stable state within this temperature range.
• • Weightlessness ladder: indicates the occurrence of volatilization, decomposition, or dehydration.
• • Weight gain stage: indicates the occurrence of oxidation reaction or adsorption.
• DTG curve (Derivative Thermogravimetry) The first derivative of the TG curve with respect to temperature/time.
• Key factors affecting test accuracy As a professional engineer, it is necessary to avoid the following interferences when designing experiments:
• • Heating rate: A faster heating rate can cause the TG curve to shift towards higher temperatures, affecting kinetic parameters.
• • Sample quantity and morphology: Too much sample quantity can create an internal thermal gradient, impeding the diffusion of gaseous products. It is recommended to use thin slices or fine powder.
• • Crucible material: Commonly used alumina crucible. If the sample contains fluorine (such as PTFE) or reacts with aluminum at high temperatures, a platinum or quartz crucible should be used instead.
• • Buoyancy effect: The expansion of gas due to heating can lead to changes in apparent weight, which must be eliminated through.