Mercury intrusion porosimetry equipment

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Discussion Overview

The discussion centers around the use of Mercury intrusion porosimetry equipment for determining the pore diameter range of porous ceramic materials, specifically addressing its limitations in measuring macroporosity and clarifying related concepts such as pore number fraction and total porosity calculations.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes that Mercury intrusion porosimetry can determine micro and mesoporosity but is inadequate for macroporosity, questioning the reasons behind this limitation.
  • Another participant suggests that the pressure range used may be insufficient to cover macropores, indicating that at larger pore sizes, the mercury flows into the pores without resistance, leading to unreliable measurements.
  • This participant also mentions that the maximum pore size output is 130 µm, but they trust the measurements only up to about 60 µm, beyond which the data may become unreliable.
  • The original poster seeks clarification on the concept of pore number fraction and how to calculate total porosity using apparent density and real density from different measurement techniques.

Areas of Agreement / Disagreement

Participants express differing views on the effectiveness of Mercury intrusion porosimetry for measuring macroporosity, with some agreeing on its limitations while others provide additional context or resources without reaching a consensus on the best practices.

Contextual Notes

There are unresolved assumptions regarding the definitions of pore size categories and the specific conditions under which the measurements are taken, which may affect the reliability of the results.

Msl
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Hello

I have used the Mercury intrusion porosimetry equipment to determine pore diameter range of porous ceramic material. But it only determined the micro and meso porosity. I also read that this tecnique is not adequate to determine macroporosity. Do you know Why?

This equipment also determined pore number fraction. Can you tell me what is this?

How do I calculate the total porosity with knowing the apparent density given by the porosimetry equipment and the real density given by the helium picnometer?

Thank you
 
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pressure range is probably insufficient to cover macropores (I assume you use the standard macro = >0.05um?).
The problem is that at some point the Hg just kinda flows into the pores without resistance. Then, the measurement becomes unreliable. the max. pore size it gives as an output is 130um. Practically,that size can not be measured. I trust it to 60um or so, above that, the measurement intrusion becomes noise over the entire range.

Go here for some more explanations:
http://www.micromeritics.com/Repository/Files/mercury_paper.pdf
 
Last edited:
PS: Here's exactly what you need:
http://www.micromeritics.com/Repository/Files/A_Few_Facts_Pertaining_to_the_Low_Pressure_Performance.pdf
 
Last edited by a moderator:
Hello MSl, was this of use to you?
 

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