To examine the effects of pore corrugation on capillary condensation and evaporation of a gas in cylindrical pores, we measured the adsorption hystereses and subloops of O 2 at 70 K on MCM-41 and of H 2 O at 295 K on SBA-15, and then calculated the adsorption hystereses, desorption scanning curves, and subloops of O 2, N 2, and H 2 O in the cylindrical pores with corrugation based on a dependent domain model. Here, the corrugated pores of the ordered mesoporous materials such as MCM-41 and SBA-15 are modeled as an assembly of pores that consists of alternating cylindrical domains with different diameters and the same length. In the cylindrical pores with corrugation, each domain is no longer independent of adsorption and desorption. Congruence/noncongruence between the two subloops taken in the same pressure range on adsorption and desorption branches depended not only on adsorbents but also on adsorbates. The dependent domain model can well account for the noncongruent subloops observed for O 2, N 2, and H 2 O in the ordered mesoporous materials with cylindrical pores. In addition, it is strongly suggested that there is a threshold amplitude of the pore corrugation below which capillary condensation and evaporation are no longer influenced by the corrugation and occur irreversibly in the whole space of a given pore at particular condensation and evaporation pressures, respectively.
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Kunimitsu Morishige (2017) studied this question.
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