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Facilitated Diffusion

Facilitated Diffusion

The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...

Facilitated Transport

Facilitated Transport

The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In facilitated transport, also known as facilitated diffusion, molecules and ions travel across a membrane via...

Facilitated Transport

Facilitated Transport

The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In facilitated transport, also known as facilitated diffusion, molecules and ions travel across a membrane via...

Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

Diffusion

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...

Diffusion

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...

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Related Experiment Video

Updated: May 25, 2026

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Transport into metal-organic frameworks from solution is not purely diffusive.

Shuangbing Han¹, Thomas M Hermans, Patrick E Fuller

¹Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA.

Angewandte Chemie (International Ed. in English)

|February 3, 2012

Summary

Guest molecule transport into metal-organic frameworks (MOFs) requires more than simple diffusion. Interactions between guest molecules and the MOF structure are crucial for understanding this chemical process.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Published on: June 14, 2024

Area of Science:

Materials Science
Chemical Engineering
Physical Chemistry

Background:

Understanding guest molecule transport in porous materials is essential for applications like gas storage and catalysis.
Existing models often simplify transport phenomena, neglecting crucial molecular interactions.

Purpose of the Study:

To investigate the mechanisms of solution transport into metal-organic framework (MOF) crystals.
To determine the limitations of pure diffusion models in describing guest-MOF interactions.

Main Methods:

Utilized a combination of confocal microscopy for real-time observation.
Employed reaction-diffusion modeling to analyze transport dynamics.
Studied guest molecule interactions with the MOF scaffold.

Main Results:

Pure diffusion models were found to be insufficient for describing solution transport into MOFs.
Accounting for guest molecule-MOF scaffold interactions is necessary for accurate modeling.
Confocal microscopy and reaction-diffusion modeling offer a powerful combined approach.

Conclusions:

Guest molecule transport in MOFs is a complex process influenced by molecular interactions.
Advanced modeling techniques that include scaffold interactions are required for precise predictions.
The combined microscopy and modeling approach provides new insights into MOF transport phenomena.