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Related Concept Videos

Diffusion01:21

Diffusion

5.4K
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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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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

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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...
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Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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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.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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Viscosity01:17

Viscosity

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When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

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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...
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Updated: Sep 20, 2025

The Diffusion of Passive Tracers in Laminar Shear Flow
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The Diffusion of Passive Tracers in Laminar Shear Flow

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How Stickiness Can Speed Up Diffusion in Confined Systems.

A Alexandre1, M Mangeat2, T Guérin1

  • 1Laboratoire Ondes et matière d'Aquitaine, CNRS/University of Bordeaux, F-33400 Talence, France.

Physical Review Letters
|June 10, 2022
PubMed
Summary
This summary is machine-generated.

Attractive surfaces can unexpectedly accelerate Brownian tracer dispersion in heterogeneous media, even with slower surface diffusion. This finding challenges conventional understanding of crowding effects in diffusion studies.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Statistical Mechanics

Background:

  • Diffusion in heterogeneous media is typically modeled using reflecting obstacles and surfaces.
  • Crowding effects from these boundaries are known to impede tracer dispersion.
  • Understanding boundary interactions is crucial for predicting transport phenomena.

Purpose of the Study:

  • To investigate the impact of attractive surfaces on tracer dispersion in heterogeneous media.
  • To analytically demonstrate how surface interactions can accelerate diffusion.
  • To explore conditions where enhanced diffusion occurs despite surface properties.

Main Methods:

  • Developed a general adsorption-desorption model incorporating surface diffusion.
  • Employed analytical methods to derive dispersion formulas.
  • Validated findings with numerical calculations and Monte Carlo simulations.

Main Results:

  • Attractive surfaces and obstacles can accelerate tracer dispersion, contrary to the crowding effect.
  • Enhanced diffusion is observed even when surface diffusion is slower than bulk diffusion.
  • Diffusion enhancement persists even when surface-only diffusion is lower than with reflecting boundaries.

Conclusions:

  • Surface attractiveness can overcome crowding effects to accelerate diffusion.
  • The study provides analytical frameworks for understanding diffusion enhancement in complex geometries.
  • Results offer new perspectives on transport phenomena in confined and structured environments.