BET Specific Surface Area

Using the BET theory, a particle's actual or specific surface area, including surface irregularities and pore walls, is determined at an atomic level by the adsorption of an unreactive gas. Because most gases and solids interact weakly, the solid material must be cooled, typically using a cryogenic liquid.

Nitrogen is chemically inert, readily available, and has well-characterized adsorption properties at liquid nitrogen temperature, making it suitable for consistent and reproducible surface area measurements.

Degassing removes moisture and contaminants from the surface. Incomplete degassing blocks adsorption sites, leading to underestimation of surface area, while excessive heating may alter material structure.

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