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Passive Diffusion: Overview and Kinetics01:17

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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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...
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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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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.
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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...
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When does near-wall hindered diffusion influence mass transport towards targets?

Shaltiel Eloul1, Enno Kätelhön1, Richard G Compton1

  • 1Department of Chemistry, Physical and Theoretical Chemistry, Oxford University, South Parks Road, Oxford OX1 3QZ, UK. richard.compton@chem.ox.ac.uk.

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Particle diffusion slows near surfaces, significantly impacted by particle and target sizes. This study quantizes hindered diffusion for nanoparticles impacting various targets, crucial for biological systems.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Nanotechnology

Background:

  • Particle diffusion is fundamental in many physical and biological processes.
  • Diffusion rates can be altered by proximity to surfaces and interfaces.
  • Understanding these alterations is key for controlling nanoscale transport.

Purpose of the Study:

  • To investigate the phenomenon of hindered diffusion for nanoparticles near surfaces.
  • To determine the key factors influencing hindered diffusion, specifically particle and target size.
  • To provide predictive models for nanoparticle transport and impact frequency.

Main Methods:

  • Theoretical analysis of particle diffusion dynamics near different geometries.
  • Development of equations to model particle flux and impact frequency.
  • Comparison of theoretical predictions with existing experimental observations.

Main Results:

  • Hindered diffusion is significant when particle and target sizes are comparable.
  • Impact frequency is strongly dependent on the relative sizes of the nanoparticle and target.
  • Provided data allows inference of impact frequency under various experimental conditions.

Conclusions:

  • The size-dependent hindered diffusion of nanoparticles is a critical factor in transport phenomena.
  • The findings are essential for accurate calculations of mean first passage times, especially for sub-micron targets.
  • This research highlights the importance of hindered diffusion in biological systems and nanoscale applications.