Estimating the Minimum Pore Size in Globular Systems with Capillary Hysteresis

Yu. K. Tovbin and A. G. Petukhov

Karpov Institute of Physical Chemistry, ul Vorontsovo Pole 10, Moscow, 105064 Russia

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Received June 15, 2007

Abstract — A technique of estimating the minimum size of pores in regular globular structures, the isotherms of which may have a hysteresis loop that indicates the capillary condensation, is proposed. As a criterion of the minimum pore size, the contribution from the middle pore volume unaffected by the wall potential, which was found from the experimental data for infinitely long cylindrical channels, is used. The estimates for regular globular structures are compared to the similar estimates for spherical and cubic pores. The ways of taking into account the restricted size of pores in the case of irregular globular packing are discussed.

PACS numbers: 47.55.nb