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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...
Diffusion01:21

Diffusion

Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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...

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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

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Molecular diffusion between walls with adsorption and desorption.

Maximilien Levesque1, Olivier Bénichou, Benjamin Rotenberg

  • 1CNRS, UPMC Univ. Paris 06, UMR 7195 PECSA, 75005 Paris, France. maximilien.levesque@gmail.com

The Journal of Chemical Physics
|January 25, 2013
PubMed
Summary
This summary is machine-generated.

Adsorption and desorption processes significantly alter particle diffusion in porous media. This study derives the time-dependent diffusion coefficient, offering insights into material properties and applications in sorption measurements.

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Area of Science:

  • Physics
  • Materials Science
  • Physical Chemistry

Background:

  • Particle diffusion in porous media is sensitive to geometry.
  • Nuclear magnetic resonance (NMR) measures diffusion coefficients.
  • Wall interactions like adsorption/desorption are common in practical scenarios.

Purpose of the Study:

  • To derive the time-dependent diffusion coefficient in the presence of adsorption/desorption between confining walls.
  • To analyze how adsorption/desorption affects diffusion coefficient's time dependency.
  • To propose applications for the derived model.

Main Methods:

  • Theoretical derivation of the time-dependent diffusion coefficient.
  • Analysis of the derived mathematical expression.
  • Exploration of model implications for practical applications.

Main Results:

  • Explicit expression for the time-dependent diffusion coefficient with adsorption/desorption derived.
  • Demonstration of significant modification of diffusion behavior by adsorption/desorption.
  • Identification of potential applications in sorption measurements and numerical simulations.

Conclusions:

  • Adsorption/desorption strongly influence particle diffusion dynamics in confined porous media.
  • The derived model provides a framework for understanding and quantifying these effects.
  • The findings have implications for characterizing porous materials and developing advanced simulation techniques.