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Related Concept Videos

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...
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...
Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
Facilitated Diffusion01:16

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...
Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting their diffusion into...
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...

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Related Experiment Video

Updated: Jun 3, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

Diffusion between evolving interfaces.

Janne Juntunen1, Juha Merikoski

  • 1Department of Physics, University of Jyväskylä, Jyväskylä, Finland. janne.k.juntunen@jyu.fi

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 16, 2011
PubMed
Summary
This summary is machine-generated.

Particle diffusion in dynamic environments is complex. Bubble size and interface behavior significantly influence diffusion rates, even with simple repulsion rules.

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Area of Science:

  • Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Understanding particle diffusion is crucial in various scientific fields.
  • Dynamic environments introduce complexities not present in static systems.
  • Previous models often simplify the interaction between particles and their surroundings.

Purpose of the Study:

  • To investigate diffusion dynamics in an evolving, confined environment.
  • To model the behavior of continuous-time random walkers in a system with dynamic interfaces.
  • To determine the factors governing diffusion in a constrained, evolving space.

Main Methods:

  • Utilized continuous-time Monte Carlo simulations.
  • Modeled diffusion using continuous-time random walkers on a lattice.
  • Introduced dynamic bubbles between two symmetrically driven one-dimensional interfaces.

Main Results:

  • In one-dimensional systems, bubble size distribution was the primary factor controlling diffusion.
  • For two-dimensional random walkers, interface topography and dynamics also played a significant role.
  • One-dimensional results were reproduced in the limit of strongly driven interfaces.

Conclusions:

  • Diffusion in evolving environments is highly sensitive to interface properties and dynamics.
  • Even simple particle-interface repulsion rules lead to complex diffusion behaviors.
  • The findings provide insights into particle transport in dynamic, confined systems.