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3. Adsorption of a gas by a solid
3.1 Adsorption phenomenon
A very general phenomenon, adsorption is usually defined as the enrichment of molecules, atoms or ions in the vicinity of an interface. For the gas/solid systems we're interested in here, this means an increase in gas concentration in the vicinity of, but outside, the solid surface. The term adsorption indicates that this is a surface phenomenon, and should not be confused with absorption, which would indicate that the fluid has penetrated the solid mass, deforming it.
The solid is then called the adsorbent, and the fluid likely to be retained on the surface of the solid is the adsorbable.
Desorption is the release of gases or vapors retained by adsorption on the surface...
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Adsorption of a gas by a solid
Adsorption theories
Bibliography
- (1) - THOMMES (M.), KANEKO (K.), NEIMARK (A.V.), OLIVIER (J.P.), RODRIGUEZ-REINOSO (F.), ROUQUEROL (J.S.W.), SING (K.S.W.) - Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC Technical Report) . - Pure and Appl. Chem., 87(9-10), p. 1051-1069...
Software tools
Excel sheet for BET and "t" calculations ("physi view calc") http://www.micromeritics.com/Library/Freeware-Software.aspx
Events
On a national scale: Annual days of the French Adsorption Association, usually in January-February. http://www.adsorption.fr/spip.php?rubrique1
On an international scale: Fundamentals of Adsorption (FOA), organized by the International Adsorption Society and rotating between Europe, America and Asia, every three years...
Standards and norms
- Détermination de l'aire massique (surface spécifique) des poudres par adsorption de gaz. Méthode BET : mesure volumétrique par adsorption d'azote à basse température, p. 175-186 - NF. X 11-621 - 11-75
- Determination of the specific surface area of solids by gas adsorption – BET method - ISO 9277 - 2010
- Standard test method for advanced ceramic specific surface area by physical adsorption - ASTM C1274-12...
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...
Equipment sold
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Choosing a device
A list of commercial adsorption manometers for use with nitrogen at its normal liquefaction temperature is given in the following tables. Some of these only give access to the specific surface area (tables 1 and
Associations (non-exhaustive list)
Association Française d'Adsorption (AFA) French-speaking association whose aim is to promote the advancement of experimental, numerical and theoretical methods in the fields of adsorption from liquid or gaseous phases, on solid surfaces or in porous materials, and which organizes annual conferences often accompanied by a "School" day.
Training courses and seminars (non-exhaustive list)
CNRS-Formation Entreprises, 2 ½-day course entitled "Gas adsorption and applications: materials characterization and gas separation or storage" organized at the MADIREL laboratory http://cnrsformation.cnrs.fr
Laboratories (non-exhaustive list)
MADIREL Laboratory, Aix-Marseille University, CNRS, UMR 7246, St Jérôme Campus
Laboratories affiliated to the Association Française d'Adsorption, a list of which, with a link to its own web page, can be found at http://www.adsorption.fr/spip.php?rubrique2
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