GB/T 36065-2018 in English

Application of Thermogravimetric Analysis (TGA) in Carbon Nanotube Analysis

Calculation formula for amorphous carbon content: $\mathcal{W}_{am} = \mathcal{w}_{300} - \mathcal{w}_{e}$

Definition of main oxidation temperature (Tox'): The temperature corresponding to the maximum mass loss rate of carbon nanotube sample in oxidizing atmosphere.

Test method and data analysis

Test environment conditions: temperature range $15^\circ C \sim 35^\circ C (±2^\circ C)$, humidity less than 80%.

Instrument calibration needs to refer to GB/T 29189 to ensure the accuracy and stability of the thermogravimetric analyzer.

Data analysis under different experimental atmospheres

• Carbon dioxide atmosphere: Calculate the amorphous carbon content (Wam) using the formula $\mathcal{W}_{am} = \mathcal{w}_{300} - \mathcal{w}_{e}$.
• Oxygen and synthetic air mixture atmosphere: Determine the main oxidation temperature (Tox') and the extrapolated onset temperature (Te), and calculate the ash content (Rres).
• Nitrogen atmosphere: Calculate the volatile matter content (Wv) using the formula $w_{v} = 1 - w_{1}$.

Implementation suggestions

1. Before the experiment, ensure that the instrument is calibrated and select the appropriate crucible type (such as platinum crucible or alumina crucible).

2. Determine the sampling mass according to the sample density. It is recommended to take $\frac{1}{3} \sim \frac{1}{2}$ of the crucible volume.

3. When testing under different experimental atmospheres, it is necessary to record the airflow rate and temperature control parameters to ensure data consistency.