Microporous material

A microporous material is a material containing pores with diameters less than 2 nm. Examples of microporous materials include zeolites and metal-organic frameworks.

Porous materials are classified into several kinds by their size. The recommendations of a panel convened by the International Union of Pure and Applied Chemistry (IUPAC) are:^[1]

Microporous materials have pore diameters of less than 2 nm.
Mesoporous materials have pore diameters between 2 nm and 50 nm.
Macroporous materials have pore diameters of greater than 50 nm.

Micropores may be defined differently in other contexts. For example, in the context of porous aggregations such as soil, micropores are defined as cavities with sizes less than 30 μm.^[2]

^ Rouquerol, J.; et al. (1994). "Recommendations for the characterization of porous solids" (PDF). Pure Appl. Chem. 66: 1739–1758. doi:10.1351/pac199466081739. S2CID 18789898. Archived (PDF) from the original on 2015-02-24. Retrieved 2015-02-24. See page 1745.
^ Soil Science Glossary Terms Committee (2008). Glossary of Soil Science Terms 2008. Madison, WI: Soil Science Society of America. ISBN 978-0-89118-851-3. Archived from the original on 2021-04-14. Retrieved 2021-11-26.

[1] Rouquerol, J.; et al. (1994). "Recommendations for the characterization of porous solids" (PDF). Pure Appl. Chem. 66: 1739–1758. doi:10.1351/pac199466081739. S2CID 18789898. Archived (PDF) from the original on 2015-02-24. Retrieved 2015-02-24. See page 1745.

[pore-2] Soil Science Glossary Terms Committee (2008). Glossary of Soil Science Terms 2008. Madison, WI: Soil Science Society of America. ISBN 978-0-89118-851-3. Archived from the original on 2021-04-14. Retrieved 2021-11-26.

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