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Adsorption Isotherms I

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...

Adsorption Isotherms II

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...

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Related Experiment Video

Updated: Jun 23, 2026

Monitoring Protein Adsorption with Solid-state Nanopores

Monitoring Protein Adsorption with Solid-state Nanopores

Published on: December 2, 2011

Effective interactions in multisite cells for adsorption in microporous materials.

Pierfranco Demontis¹, Federico G Pazzona, Giuseppe B Suffritti

¹Dipartimento di Chimica, Università degli Studi di Sassari, and Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, Unità di Ricerca di Sassari, via Vienna, 2, I-07100 Sassari, Italy. demontis@uniss.it

The Journal of Chemical Physics

|May 2, 2009

Summary

Simplified models accurately represent gas adsorption in nanoporous materials. A less-structured cell with two energy levels effectively mimics complex multisite adsorption behaviors, aiding mesoscopic scale simulations.

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Area of Science:

Materials Science
Chemical Engineering
Physical Chemistry

Background:

Coarse-grained models are crucial for simulating adsorption in nanoporous materials at the mesoscopic scale.
Existing models often involve complex, self-interacting multisite adsorption cells.
Understanding equilibrium properties requires accurate representation of molecular interactions and site energies.

Purpose of the Study:

To demonstrate that a simplified adsorption cell model can accurately reproduce key statistical properties.
To investigate the capability of a less-structured cell with two energy levels to mimic complex adsorption behaviors.
To provide a more computationally efficient approach for mesoscopic scale simulations of adsorption.

Main Methods:

Development of a simplified host cell model with two occupancy-dependent adsorption energy levels.
Comparison of statistical properties (partition function, average energy, average number of guests) between the simplified model and a complex multisite model.
Utilizing computational simulations to analyze adsorption behavior at the mesoscopic scale.

Main Results:

The simplified cell model successfully reproduced essential statistical properties of the more complex multisite cell.
Key properties like the partition function, average energy, and guest distribution near cell windows were accurately mimicked.
This suggests a viable simplification for mesoscopic adsorption modeling.

Conclusions:

A simplified, less-structured adsorption cell model can effectively represent complex multisite adsorption phenomena.
This simplification offers a computationally advantageous alternative for mesoscopic simulations of gas adsorption in porous materials.
The findings contribute to more efficient modeling of molecular adsorption in nanotechnology and materials science.