Specific surface area is the surface area per unit mass of material (㎡ / g). It is one of the most important physical properties of ultra-fine powder materials, especially nano-powder materials. It is used to evaluate their activities, adsorption, catalysis and other properties. Important physical properties. Therefore, in the research, manufacturing and application of various ultrafine powder materials, it is very important to determine the specific surface area. With the rapid development of ultra-fine powder materials and nano materials, the production and application of various ultra-fine zinc oxide, alumina, calcium carbonate, lithium cobalt oxide, lithium manganate, carbon black, graphite and other fields of almost all powder materials It is necessary to measure the specific surface area of ​​products, and the instrument for measuring the specific surface area has become an indispensable and important equipment for many research units, universities and factories.
There are many methods for measuring specific surface area, such as Densichron Examination, CTAB, Electronic Microscopic Examination, and Tint trength ), Nitrogen Surface Area (NitrogenSurface Area), etc. Through various methods, EM Nelson believes that the low-temperature nitrogen adsorption method is the most reliable, effective, and classic method. American ASTM and international ISO have been included in the test standards (D3037 and ISO-4650). China has also listed this method as a national standard (GB-10517). In 2003, it was included in the test standard for nano-powder materials.
The nitrogen adsorption specific surface analyzer was developed on the basis of the principle of gas chromatography. It uses nitrogen as the adsorbate and helium or hydrogen as the carrier gas. The two gases are mixed at a certain ratio to reach the specified relative pressure, and then flow through the powder material sample. When the sample tube is placed in liquid nitrogen (-196 ℃) In the thermos cup, the powder material physically adsorbs the nitrogen in the mixed gas, but the carrier gas is not adsorbed. At this time, an adsorption peak appears in the chromatography workstation (gas sensor system). When the liquid nitrogen cup was removed, the powder sample returned to room temperature, the adsorbed nitrogen was desorbed, and a desorption peak opposite to the adsorption peak appeared on the workstation. The area of ​​the adsorption peak or desorption peak is proportional to the amount of nitrogen adsorbed on the sample surface, and it can also be considered to be proportional to the surface area of ​​the powder sample. Take a standard sample, such as powder material with known specific surface area, or pure nitrogen with a known volume, obtain a standard sample peak in the workstation, and the final peak can be obtained by comparing the peak area of ​​the standard peak with the sample to be tested. Specific surface area.
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