Abstract
We have investigated a practical lower limit of a pore-size estimation by the nitrogen desorption isotherms at 77K using the Kelvin equation. Changes in pore size of porous silica glasses before and after the monolayer preadsorption of n-propylalcohol were estimated by measuring the nitrogen adsorption and desorption isotherms. These changes should correspond to the thickness of monolayer of adsorbed n-propylalcohol. The thickness of monolayers obtained for the samples whose pore sizes are below ca. 2 nm were underestimated, when the Kelvin equation was applied to the nitrogen desorption isotherms using the values of surface tension and molar volume of bulk liquid nitrogen at 77K. Below ca. 2 nm pore radius a careful application of the Kelvin equation is required to estimate a pore size. These results suggest that a change in the physical properties of liquid nitrogen in such a small pore occurs. It is supposed that the interaction between the solid surface and adsorbate molecules causes the changes in the surface tension and density of liquid nitrogen in such a narrow pore.
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Takei, T., Chikazawa, M. & Kanazawa, T. Validity of the Kelvin equation in estimation of small pore size by nitrogen adsorption. Colloid Polym Sci 275, 1156–1161 (1997). https://doi.org/10.1007/s003960050196
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DOI: https://doi.org/10.1007/s003960050196