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Specific Surface

The specific surface (in m²/kg) of an open-cell porous material is the internal pore area (~wet surface) per unit mass of solid. This specific surface can be obtained by the classical BET technique [1] generally used for powders in chemistry. The specific surface (So) can be estimated from the following relation [2]:

relation to estimate specific surface of an open-cell porous material

Where Λ′ is the thermal characteristic length, ϕ is the open porosity and ρ1 is the bulk density of the porous aggregate.

                                
[1] S. Brunauer, P. H. Emmett, and E. Teller, J. Am. Chem. Soc. 60, 309 (1938).
[2] P. Leclaire, M. J. Swift, and K. V. Horoshenkov, “Determining the specific area of porous acoustic materials from water extraction data,” J. Appl. Phys. 84(12), 6886-6890 (1998).