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2. Micropore characterization
2.1 Highlighting microporosity
To begin with, it should be noted that micropores fill at very low relative pressures, sometimes as low as 10 –7 w/w 0 , which corresponds to a nitrogen equilibrium pressure of 10 –4 mbar. To be able to highlight microporosity, it is therefore necessary to ensure that the apparatus used enables reliable measurements to be made at these low pressures. This requires not only a 0 to 1 mbar pressure gauge, but also a device that is sufficiently tight to obtain a static vacuum for the duration of the measurements. Moreover, the smaller the micropores, the longer it takes to reach equilibrium, since diffusion of nitrogen...
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Micropore characterization
Mesopore characterization
Bibliography
Software tools
Database of hundreds of adsorption isotherms, including many new adsorbents http://adsorbents.nist.gov/
NLDFT calculations http://www.NLDFT.com
Fluid properties https://www.nist.gov/srd/refprop
...Events
On a national scale: annual days of the French Adsorption Association, usually in January-February. http://www.adsorption.fr/spip.php?rubrique1
Internationally: three successive triennial congresses, one per year, usually in April-May, in the following order:
Fundamentals...
Standards and norms
- Pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption – Part 2 : Analysis of mesopores and macropores by gas adsorption - ISO 15901-2 - 2006
- Pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption – Part 3 : Analysis of micropores by gas adsorption - ISO 15901-3 - 2007
Regulations. Safety
Use of liquid nitrogen http://bip.cnrs-mrs.fr/acmo/node8.html
Handling nanomaterials and nanoparticles http://www.inrs.fr/risques/nanomateriaux/prevention-risques.html
Gas handling...
Directory
Marketed equipment (non-exhaustive list)
The commercial adsorption units shown in Table allow a detailed study based on the nitrogen adsorption-desorption isotherm at 77 K. Generally speaking, the adsorption isotherm domain they automatically record, and the software they are equipped with, allow fairly easy access to specific surface area (BET method
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