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Related Concept Videos

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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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.
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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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Related Experiment Video

Updated: Apr 27, 2026

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy
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Short-time diffusivity of dicolloids.

Mark M Panczyk1, Norman J Wagner1, Eric M Furst1

  • 1Department of Chemical and Biomolecular Engineering and Center for Molecular and Engineering Thermodynamics, Allan P. Colburn Laboratory, 150 Academy Street, University of Delaware, Newark, Delaware 19716, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 15, 2014
PubMed
Summary
This summary is machine-generated.

Short-time diffusivity of dicolloid particles was measured. Symmetric dicolloids show higher diffusivity than spheres, explained by rescaling volume fraction, offering a new calculation method.

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Area of Science:

  • Colloid Science
  • Soft Matter Physics
  • Particle Dynamics

Background:

  • Understanding particle diffusion is crucial in colloid science.
  • Diffusivity is influenced by particle shape, size, and concentration.
  • Dicolloid particles present unique hydrodynamic properties compared to spheres.

Purpose of the Study:

  • To measure the short-time diffusivity of dicolloid particles.
  • To compare the diffusivity of symmetric and asymmetric dicolloids with spheres.
  • To develop a method for calculating dicolloid diffusivity based on aspect ratio.

Main Methods:

  • Diffusing wave spectroscopy (DWS) was employed to measure short-time diffusivity.
  • Experiments were conducted across a range of particle volume fractions (0.01 ≤ ϕ ≤ 0.6).
  • Dicolloid volume fraction was rescaled using random close-packing ratios for comparison.

Main Results:

  • Short-time diffusivity decreased with increasing volume fraction for spheres and asymmetric dicolloids.
  • Diffusivity was independent of salt concentration.
  • Symmetric dicolloids exhibited higher diffusivity than spheres at comparable volume fractions.

Conclusions:

  • The enhanced diffusivity of symmetric dicolloids can be explained by rescaling their effective volume fraction.
  • A novel method for calculating symmetric dicolloid diffusivity is proposed, applicable to various aspect ratios.
  • This study provides insights into the hydrodynamic behavior of complex colloidal systems.