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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...
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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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Related Experiment Video

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Self-diffusion in two-dimensional hard ellipsoid suspensions.

Zhongyu Zheng1, Yilong Han

  • 1Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.

The Journal of Chemical Physics
|October 5, 2010
PubMed
Summary
This summary is machine-generated.

Colloidal ellipsoid diffusion near a wall shows concentration-dependent changes in movement. Particle caging influences diffusion, with anisotropic motion and rotational/translational coupling observed.

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Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Published on: May 20, 2014

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy
09:16

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

Published on: January 9, 2017

Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Brownian Motion

Background:

  • Understanding particle dynamics is crucial in soft matter.
  • Colloidal systems near surfaces exhibit unique behaviors.
  • Anisotropic particle diffusion presents complex theoretical challenges.

Purpose of the Study:

  • To investigate the self-diffusion of colloidal ellipsoids in a monolayer near a flat wall.
  • To quantify translational and rotational diffusion coefficients as functions of particle concentration.
  • To explore the relationship between particle shape, concentration, and diffusion dynamics.

Main Methods:

  • Utilized video microscopy with a subpixel resolution image processing algorithm.
  • Tracked positions and orientations of individual colloidal ellipsoids.
  • Measured diffusion coefficients in both laboratory and body frames along principal axes.

Main Results:

  • Observed a nondiffusive crossover region due to particle caging, with concentration-dependent onset and termination times.
  • Diffusion anisotropies changed nonmonotonically with concentration, reaching minima in the semidilute regime.
  • Demonstrated coupling between rotational and translational Brownian motions, measuring characteristic time scales.

Conclusions:

  • Particle caging significantly impacts diffusion dynamics and anisotropy.
  • The observed 1/t decay in relaxation functions poses theoretical challenges.
  • Anisotropic particle shape and environment dictate coupled rotational and translational diffusion.