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Related Concept Videos

Adsorption Isotherms I01:29

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 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...
Adsorption Isotherms II01:25

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...
Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and solvents...

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Related Experiment Video

Updated: May 9, 2026

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
09:31

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Published on: March 27, 2019

Characterization of micro- and mesoporous materials using accelerated dynamics adsorption.

Ali Qajar1, Maryam Peer, Ramakrishnan Rajagopalan

  • 1Department of Chemical Engineering and ‡Materials Research Institute, Pennsylvania State University , University Park, Pennsylvania 16802, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 8, 2013
PubMed
Summary

This study introduces a new method using methyl chloride (MeCl) for faster porous material characterization. The technique accelerates adsorption dynamics, improving pore size distribution analysis near room temperature.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Porosimetry is crucial for developing porous materials for catalysis, membranes, and gas storage.
  • Conventional methods (N2, Ar, CO2) have limitations like slow dynamics, cryogenic temperatures, or high pressures.
  • Existing techniques struggle with accurate micropore characterization under practical conditions.

Purpose of the Study:

  • To investigate the impact of temperature, pressure, and probe molecule on adsorption dynamics.
  • To develop a novel method for accelerating gas adsorption measurements in porous materials.
  • To enable accurate pore size distribution analysis under non-cryogenic conditions.

Main Methods:

  • Utilized methyl chloride (MeCl) as a probe molecule for adsorption studies.
  • Conducted experiments near room temperature under nonisothermal, subatmospheric conditions.
  • Developed and applied a pressure control algorithm to enhance adsorption rates.
  • Transformed adsorption data into pore size distribution using Horvath-Kavazoe (HK), Saito-Foley (SF), and modified Kelvin methods.

Main Results:

  • The proposed pressure control algorithm significantly accelerated adsorption dynamics.
  • Adsorption rates were enhanced by a factor of 4-5 on carbonaceous and aluminosilicate samples.
  • Accurate pore size distribution profiles were obtained without compromising measurement precision.
  • Enabled porosimetry near room temperature, avoiding cryogenic requirements.

Conclusions:

  • The novel MeCl-based method with the pressure control algorithm offers a faster and more efficient approach to porosimetry.
  • This technique overcomes limitations of conventional methods, particularly for microporous materials.
  • The findings facilitate the development and characterization of advanced porous materials for various applications.