What Is Gas Adsorption Measurement?
Gas adsorption measurement is a method of obtaining specific surface area, pore size distribution (micro- and mesopores), pore volume, etc. by measuring the adsorption/desorption isotherms of gases such as nitrogen or argon that do not react with the sample on a porous sample.
Adsorption measurements can be classified into two types: physisorption and chemisorption. Physical adsorption is the adsorption of molecules on a solid surface by intermolecular forces (van der Waals forces) at low temperatures, and physical adsorption is generally a reversible phenomenon.
Chemisorption is adsorption by chemical action at high temperatures, and chemisorption is generally an irreversible reaction.
Applications for Gas Adsorption Measurement
It is used to optimize powders and porous materials, such as battery materials, catalysts, ceramics, and carbon materials.
In their evaluation, the measurement of specific surface area (BET method, etc.) and pore size distribution (micropores and mesopores) are important indicators.