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Updated: Dec 24, 2025

Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
Published on: March 8, 2024
Net, excess and absolute adsorption and adsorption of helium
Stefano Brandani1, Enzo Mangano1, Lev Sarkisov1
1Scottish Carbon Capture and Storage, School of Engineering, The University Edinburgh, The King's Buildings, Mayfield Road, Edinburgh, EH9 3FB UK.
Abstract:
The definitions of absolute, excess and net adsorption in microporous materials are used to identify the correct limits at zero and infinite pressure. Absolute adsorption is shown to be the fundamental thermodynamic property and methods to determine the solid density that includes the micropore volume are discussed. A simple means to define when it is necessary to distinguish between the three definitions at low pressure is presented. To highlight the practical implications of the analysis the case of adsorption of helium is considered in detail and a combination of experiments and molecular simulations is used to clarify how to interpret adsorption measurements for weakly adsorbed components.
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