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The Barrett–Joyner–Halenda (BJH) method is standard for pore size distribution, but the authors point out its critical flaw—it assumes cylindrical pores. For ink-bottle or slit-shaped pores, the results are wrong. They introduce advanced methods like DFT (Density Functional Theory) for better accuracy.

Widths greater than 50 nm.Understanding these scales is critical for selecting the right material for molecular sieving. 3. Adsorption Isotherms Download Adsorption by Powders and Porous Solids