Mercury Intrusion, also know as Mercury Injection, is a classical technique that provides an idea of pore sizes by injecting mercury into a core and plotting injected volume versus pressure at each step. The pressures are then converted to pore radius by applying the well-known Pc x r=2 x sigma x cos (theta). However, this technique gives just the pore size ranges, rather than counting the pores having similar radii and plotting pore size distribution in a core.
Do you have any idea on how we can use this technique to get PSD?
That is a standard method -mercury porosimetry. However, it cannot exactly say about the size of pores.Because it indicated only the connected pores where mercury travels. So small pockets have always hidden.
Hi Reza:
First: the calculation assumes that the pores are cylindrical tubes. So your pore size is of a cylindrical pore with the same entry pressure that the real one.
Second: traditionally the distribution is based in volume intruded between 2 pressures. As you mentioned it is not a real pore size as the larger pores have a bigger volume.
However, the data can be converted to PSD as described in ASTM D4404 – 84 (earlier versions, and revised 2004)
A comparison between the volume based and PSD was presented in various papers:
K. Meyer · P. Klobes Comparison between different presentations
of pore size distribution in porous materials. Fresenius J Anal Chem (1999) 363 :174–178
R. Lenormand INTERPRETATION OF MERCURY INJECTION CURVES TO DERIVE PORE SIZE DISTRIBUTION. paper SCA2003-52.Int. Symp. Society of
Core Analysts, Pau, France, 21-24 September 2003
Hi Hassan: Although mercury is the traditional method I also prefer NMR as is non destructive. The key is the evaluation/ estimation of surface relaxivity. Can you share your methodology?
As I know, pore size distribution could be calculated from capillary pressure (Pc) curve, so, from any experimental method, by means of which you can measure Pc curve, you can calculate PSD.
MICP data actually gives pore throat size distribution for connected po
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