Macropores ( English macropores ) - pores with a diameter of more than 50 nm .
Content
- 1 Description
- 2 See also
- 3 Literature
- 4 References
Description
The classification of pores by size on micro -, meso - and macropores is recommended by the International Union for Pure and Applied Chemistry (IUPAC). Unlike smaller mesopores, capillary condensation does not occur in macropores, and hysteresis is absent on the adsorption isotherms of macroporous systems. The specific surface area of macroporous materials is small and amounts to several square meters per gram of sample. The method of mercury porosimetry is usually used to determine the size of macropores. In the sorbent and catalysts, the proportion of macropores is usually small; they play the role of transport channels providing free movement of the adsorbate or reagents (reaction products) inside the porous body.
See also
- Pore size distribution
Literature
- (English) Everett DH: 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.
- Karnaukhov A.P .: Adsorption. The texture of dispersed and porous materials. - Novosibirsk: Nauka, 1999 .-- 470 p.