How to Test the Specific Surface Area of SiO2？
The specific surface area of silicon dioxide is a very important parameter, which plays an important role in production control and is also a standard parameter to measure and judge the quality of silicon powder, so the test of specific surface area is essential.
Specific surface area of silica powder is the surface area per gram of solid material, m2/g; The national standard for specific surface area of silica is the low-temperature nitrogen adsorption BET multi-point method based on the BET theory (GB/T 19587-2004). The key point to determine the specific surface area by nitrogen adsorption BET multi-point method is: within the range of 5-30% nitrogen partial pressure, measure the amount of nitrogen adsorbed by the adsorbent (powder to be measured) at different nitrogen partial pressure points, draw the adsorption isotherm, and calculate the saturated adsorption amount of the monolayer corresponding to the monolayer when the adsorbent surface is covered with nitrogen molecules through BET formula, so as to calculate the specific surface area of the adsorbent.