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Related Concept Videos

Diffusion01:21

Diffusion

4.3K
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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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...
854
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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Distillation: Vapor–Liquid Equilibria01:01

Distillation: Vapor–Liquid Equilibria

2.9K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
2.9K
Diffusion on Chromatography Columns01:07

Diffusion on Chromatography Columns

622
In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...
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Updated: Aug 14, 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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Diffusion in liquid mixtures.

A Vailati1, H Bataller2, M M Bou-Ali3

  • 1Department of Physics "A. Pontremoli", Università degli Studi di Milano, Milano, Italy. alberto.vailati@unimi.it.

NPJ Microgravity
|January 16, 2023
PubMed
Summary
This summary is machine-generated.

Investigating fluid transport and mixing at the mesoscopic scale under microgravity is crucial for space exploration. This research optimizes material processing for long-duration space missions by understanding fluid dynamics without buoyancy-driven convection.

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Last Updated: Aug 14, 2025

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Area of Science:

  • Fluid dynamics
  • Space exploration
  • Materials science

Background:

  • Transport and mixing in fluids are critical for sustaining long space missions.
  • Current research primarily focuses on macroscopic and microscopic scales.
  • Mesoscopic scale investigation is vital for understanding mass transfer in confined systems.

Purpose of the Study:

  • To explore fluid transport and mixing at the mesoscopic scale under microgravity.
  • To analyze the impact of external fields and reactions on fluid dynamics in space.
  • To optimize material processing for space applications by eliminating buoyancy-driven convection.

Main Methods:

  • Investigation of fluid transport and mixing phenomena.
  • Analysis under microgravity conditions.
  • Study of external fields and reactions influencing fluid behavior.

Main Results:

  • Microgravity enables the study of transport and mixing without buoyancy effects.
  • Understanding mesoscopic transport is key for confined systems like porous and biological media.
  • Potential for optimizing fluid handling and material processing in space.

Conclusions:

  • Mesoscopic fluid transport and mixing are strategically important for space exploration.
  • Microgravity offers a unique environment to study these processes.
  • Findings have significant implications for in-space material processing and long-duration missions.