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Related Concept Videos

Adsorption of Gases on Solids01:28

Adsorption of Gases on Solids

Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
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Gas solubility in liquids forms liquid-gas solutions, such as soft drinks, where carbon dioxide is dissolved in water, and the ocean, where the solubility of oxygen and carbon dioxide supports marine life. The ability of oceans to dissolve gases impacts weather conditions in the troposphere.However, gas-liquid interactions vary. For instance, hydrogen chloride gas is highly soluble in water, while oxygen's solubility is much lower. Because these solutions are non-ideal, Raoult’s law, which...
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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 II01:25

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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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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
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Gas Sorption Measurements in MOFsA Tutorial for Beginners.

Marzena Pander1, Chiranjib Gogoi2, Wojciech Bury2

  • 1Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland.

ACS Materials Au
|July 11, 2026
PubMed
Summary

This tutorial guides new researchers on low-pressure gas adsorption measurements for porous materials like metal-organic frameworks (MOFs). It covers sample preparation, activation, measurement, and data analysis for characterizing textural properties.

Keywords:
BET analysisMOFadsorptiondata reportingisothermmetal−organic frameworkspore volumeporositysample activationtutorial

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Nanotechnology

Background:

  • Adsorption measurements are essential for characterizing porous solids, determining properties like Brunauer-Emmett-Teller (BET) surface area, pore volume, and pore size distribution.
  • Accurate gas sorption analysis in metal-organic frameworks (MOFs) is vital for assessing their performance and understanding their textural characteristics, including adsorption capacity.

Purpose of the Study:

  • To provide a practical guide for students and new researchers on performing low-pressure gas adsorption measurements (up to atmospheric pressure).
  • To detail key aspects of gas sorption analysis in metal-organic frameworks (MOFs), serving as an entry-level teaching resource.

Main Methods:

  • Detailed discussion of sample preparation techniques specific to porous materials.
  • Explanation of various activation strategies to ensure accurate adsorption measurements.
  • Overview of low-pressure gas adsorption measurement techniques and data analysis procedures.

Main Results:

  • The tutorial comprehensively covers sample preparation, activation, measurement techniques, and data analysis for gas sorption in MOFs.
  • It emphasizes the importance of these methods for accurate determination of textural properties and host-guest interactions.

Conclusions:

  • This tutorial serves as a foundational resource for understanding and conducting gas sorption measurements in metal-organic frameworks (MOFs).
  • It equips researchers with the necessary knowledge to characterize MOFs effectively using adsorption techniques.