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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Colloidal particles can form shells around microcapsules, creating 'colloidosomes'.
  • These shells offer potential control over surface porosity and permeability.
  • Previous data on selectivity has been largely qualitative.

Purpose of the Study:

  • To quantitatively examine the effect of colloidal shells on hydrogel release rates.
  • To investigate the influence of shell particle size on molecular transport.
  • To understand the mechanisms governing permeability control in colloidosomes.

Main Methods:

  • Coating hydrogels with colloidal particle shells.
  • Measuring the release rates of three model molecules: Aspirin, caffeine, and FITC-dextran.
  • Analyzing the impact of shell particle size and molecular dimensions on diffusion.

Main Results:

  • Colloidal shells significantly reduced the transport rate of all tested molecules.
  • The reduction in transport rate was largely independent of shell particle size across three orders of magnitude.
  • Small molecules (Aspirin, caffeine) showed a threefold reduction in diffusion coefficient; dextran release was suppressed more significantly.

Conclusions:

  • Colloidal shells effectively control molecular release from hydrogels.
  • The size of the colloidal particles in the shell is not the primary factor determining transport selectivity.
  • A diffusion model incorporating particle volume fraction, diameter, and molecule size explains the observed release behavior.