Pore filling by oxygen takes place reversibly at 77 K in pores of effective width of ca. 2.6 nm, whereas hysteresis is involved in the filling (by capillary condensation) of wider pores; it appears that the oxygen meniscus becomes unstable at cylindrical pore widths < ca. 2.9 nm.
P. J. Branton, K. Kaneko and K. S. W. Sing, Chem. Commun., 1999, 575 DOI: 10.1039/A900795D
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