External surface

{
  "id": "MLC-T-CHM-004274",
  "term": "External surface",
  "field": "Chemistry",
  "definition": "The accessible surface area of a porous material that is not part of its internal pore structure. This includes the geometric outer boundary of the particle or material, as well as the mouths of any pores that are large enough to be readily accessed by adsorbate molecules. It is distinct from the internal surface area, which comprises the walls of the pores.",
  "subject": "Physical and Biophysical Chemistry",
  "references": [
    "PAC, 1972, 31, 577. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry' on page 585 (https://doi.org/10.1351/pac197231040577)",
    "PAC, 1976, 46, 71. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units - Appendix II. Definitions, Terminology and Symbols in Colloid and Surface Chemistry. Part II: Heterogeneous Catalysis' on page 79 (https://doi.org/10.1351/pac197646010071)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/external-surface/"
}