According to the IUPAC report released in 2015, there are three different stages in the physical adsorption that occur on mesoporous materials:
1) Monolayer?multilayer: All adsorbed molecules are in contact with the surface layer of the adsorbent.
2) Multilayer? Adsorption: The adsorption space contains more than one layer of molecules, so that not all of the adsorbed molecules are in direct contact with the surface of the adsorbent. In the mesopores, the multi-layer adsorption is followed by agglomeration that occurs in the pores. ?
3) Capillary? (or?pore)? Condensation: A phase in which a gas condenses into a liquid phase in a pore when the pressure p is less than its saturation pressure p0. Capillary condensation reflects the gas-liquid phase changes that occur in a finite volume system. The term "capillary (or pore) agglomeration" cannot be used to describe the micropore filling process because no phase change between gas and liquid is involved in the micropores. ?
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