Abstract
Pore size and size distribution have significant effects over a wide range of phenomena from the adsorbency of fine powders in chemical catalysis to the frost resistance of bricks. Due to this, pore size measurements have been described using a wide range of techniques and apparatus. Pore surface area is generally accepted as being the difference between the area of the surface envelope of the particle and its total surface area. The pores may be made up of fissures and cavities in the particle: they may be V-shaped, i.e. wide-necked; or ‘ink-bottle’ pores, i.e. narrow-necked. In order that their volume distribution may be determined, it is necessary that they are not totally enclosed and that the molecules used for measurement purposes may enter through the neck. The presence and extent of small open pores may be determined by finding the volume of a powder by immersing it in mercury and finding the volume displacement, then finding the volume in a gas pyknometer, using helium as the gas. Since mercury does not wet most solids it leaves the pores unfilled, and the difference between the two volumes is the pore volume. Closed pores may be evaluated by grinding the powder which opens out some of the pores, thus decreasing the apparent solid volume.
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© 1981 T. Allen
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Allen, T. (1981). Determination of pore size distribution by gas adsorption. In: Particle Size Measurement. Powder Technology Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-3063-7_18
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DOI: https://doi.org/10.1007/978-1-4899-3063-7_18
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