macropores (rus. макропоры) — pores whose diameter exceeds 50 nm.

Description

The classification of pores by size into micro-, meso- and macropores is recommended by the International Union of Pure and Applied Chemistry (IUPAC). In contrast to smaller mesopores, no capillary condensation occurs in macropores, and adsorption isotherms of macroporous systems have no hysteresis. The specific surface area of macroporous materials is small and equals several square metres per gram. The size of macropores is usually determined using mercury porosimetry. In sorbents and catalysts the fraction of macropores is usually small; they play the role of transport channels that provide free motion of the adsorbate or reagents (reaction product) within the porous body.

Authors

  • Smirnov Andrey V.
  • Tolkachev Nikolay N.

Sources

  1. Everett D.H. Manual of Symbols and Terminology for Physicochemical Quantities and Units: Appendix II: Definitions, terminology and symbols in colloid and surface chemistry. Part 1: Colloid and surface chemistry // Pure Appl. Chem. 1972. V. 31. P. 577–638.
  2. Karnaukhov A.P. Adsorption. The texture of dispersed and porous materials (in Russian). - Novosibirsk: Nauka, 1999. - 470. p.

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