Abstract
Factors causing errors in the evaluation of mercury porosimetry measurements are surveyed to show how the customarily calculated pore dimensions may give rise to a false impression of the pore structure. It is suggested that reintrusion curves be measured. From these measurements the net reintrusion and retention volume-pressure dependences can be evaluated and the pores can be separated into two groups, one with reversible and one with irreversible retention of mercury. A cylindrical model of a pore divided into three parts by constrictions and a model with a conical termination are used to demonstrate the procedure, which makes it possible to estimate the type of pore and the cause of the mercury retention, as well as revealing pore structure damage caused by the mercury intrusion. Samples of two porous materials, silica gel and lignite, which differ in particle size, porosity, and relative retention, are investigated using the suggested method.
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