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Measurement of the morphology of high-surface-area solids: porosimetry as a percolation process

1986; Elsevier BV; Volume: 109; Issue: 1 Linguagem: Inglês

10.1016/0021-9797(86)90298-5

1095-7103

A. P. Lane, N. Shah, Wm. Curtis Conner,

Fluid Dynamics and Thin Films

The void size distribution in high surface area solids is often characterized by porosimetry. This measurement technique involves the sequential invasion of a fluid into the void structure as pressure is increased and its evacuation as the pressure is subsequently decreased. It is attractive to view porosimetry as a network percolation process. However, the process of porosimetry differs from classical percolation processes in certain significant ways. In addition to the problem of sequential availability, "shadowing," during the intrusion, only a fraction of the constrictions in the void structure are measured. We have also found that there is a similar "shadowing" during extrusion. These deviations from classical percolation theory and the influence on porosimetry are discussed.