This is an introduction to the evaluation of the BET specific surface area of porous silica (Type IV adsorption isotherm)!
This document introduces the evaluation of the BET specific surface area of porous silica (Type IV adsorption isotherm) using graphs and other materials. The specific surface area (surface area per unit mass) of a powder with a certain mass increases with the presence of pores or when the particle size becomes smaller. This specific surface area can be evaluated using the BET theory based on three assumptions derived from the adsorption isotherm. In the case of Type II and IV adsorption isotherms, the BET equation is linear in the range of p/p0 = 0.05-0.3 (the relative pressure range where a monolayer is formed). 【Three Assumptions of BET Theory】 ■ Surface energy is uniform ■ There is no interaction between adsorbed molecules ■ The adsorption energy for the second layer and beyond is equal to the condensation energy *For more details, please refer to the PDF document or feel free to contact us.
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