Test specific surface area nitrogen adsorption
There are many methods for measuring the specific surface area of ​​nitrogen adsorption. Among them, the gas adsorption method is widely used in various industries at home and abroad because of its scientific testing principle, the reliability of the test process, and the consistency of the test results. In addition to other test methods, it has become recognized as the most authoritative test method. Many international standards organizations have listed the gas adsorption method as the specific surface area test standard, such as ASTM D3037 of the United States and ISO-9277 of the international ISO standards organization. There are many industry standards for specific surface area testing in China, the most representative of which is the national standard GB / T 19587-2004 "Determination of Specific Surface Area of ​​Solid Matters by Gas Adsorption BET Method".
The principle of measuring specific surface area by gas adsorption method is based on the adsorption characteristics of gas on a solid surface. Under a certain pressure, the surface of the sample particle (adsorbent) under test has a reversible physical adsorption effect on gas molecules (adsorbate) at ultra low temperature There is a certain equilibrium adsorption amount corresponding to a certain pressure. By measuring this equilibrium adsorption amount, the specific surface area of ​​the sample to be measured is equivalently determined using a theoretical model. Due to the irregularity of the outer surface of the actual particle, strictly speaking, this method measures the total surface area of ​​the outer surface of the particle and the internal through holes that can be reached by the adsorbate molecules, as shown in the figure.
Nitrogen has become the most commonly used adsorbate due to its easy availability and good reversible adsorption characteristics. The specific surface area measured by this method is called the "equivalent" specific surface area. The concept of "equivalent" refers to: the surface area of ​​the sample is the number and maximum number of nitrogen molecules coated (adsorbed) by the close packing of its surface Characterized by the cross-sectional area. The equilibrium saturation adsorption capacity (V) of nitrogen molecules on the sample surface is actually measured, and the single layer saturation adsorption capacity (Vm) is calculated by different theoretical models, and then the number of molecules is obtained, and the nitrogen molecule equivalence is calculated using the surface close-packed hexagonal model The maximum cross-sectional area (Am), you can find the specific surface area of ​​the measured sample. Calculated as follows:
It can be seen from the above formula that the accurate determination of the single-layer saturated adsorption amount Vm on the sample surface is the key to the measurement of specific surface area.
The F-Sorb 2400 specific surface area analyzer of Beijing Jine Spectrum Technology Co., Ltd. is an instrument that can truly realize the detection function of the BET method (with direct comparison method), and the more important F-Sorb 2400 specific surface area analyzer of Beijing Jin Ai Spectrum Technology Co., Ltd. It is the only fully automated intelligent specific surface area testing equipment in China so far. Its test results are highly consistent with international standards, and its stability is also very good. At the same time, it reduces human errors and improves the accuracy of test results.
Beijing Jinaipu Technology Co., Ltd. is the earliest institution in the country to participate in the calibration of specific surface area standard materials. The test results are most parallel to foreign data, and it is the only one to obtain the test certificate of Shanghai Institute of Metrology. At the same time, Beijing Jinaipu Technology Co., Ltd. is also the only manufacturer in the same industry in China with a registered capital of over one million, so you can buy your products without worries!
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