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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Diffusion through colloidal shells under stress.

J Guery1, J Baudry, D A Weitz

  • 1Laboratoire Colloïdes et Matériaux divisés, ESPCI ParisTech, UPMC, CNRS UMR 7195, 10 rue Vauquelin, 75005 Paris, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

Tensile stress was found to lower the energy barrier for diffusion in solids. This study demonstrates how mechanical stress impacts the movement of species through materials.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Colloid Science

Background:

  • Solid permeability is traditionally linked to Eyring's activated diffusion mechanism.
  • The influence of tensile stress on diffusion rates in solids lacks definitive experimental evidence.
  • Understanding stress-induced changes in material transport is crucial for various applications.

Purpose of the Study:

  • To experimentally investigate the effect of tensile stress on the diffusion rate of species through solids.
  • To quantify the relationship between applied stress and the energy barrier for diffusion.

Main Methods:

  • Utilized core-shell (liquid core-solid shell) colloidal particles as model systems.
  • Employed osmotically sensitive colloidal particles to track encapsulated probe permeation.
  • Applied controlled tensile stress to colloidal shells to measure diffusion changes.

Main Results:

  • Demonstrated an unambiguous, linear reduction in the local energy barrier for diffusion under tensile stress.
  • Quantified the direct impact of mechanical stress on the kinetics of species transport through solid materials.

Conclusions:

  • Tensile stress significantly modifies the activated diffusion process in solids.
  • The findings provide direct experimental validation of stress-dependent diffusion barriers.
  • This work offers new insights into the mechanics of material transport under mechanical load.