Diffusion of nonadsorbing polymers within hierarchically structured colloidal aggregates

David H. Reeder, Peter W. Carr, Michael C. Flickinger, Alon V. McCormick

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Nonadsorbing polystyrene is used to examine the diffusivity of large molecules within hierarchically structured ceramic particles, containing an interconnected network of macropores permeating an interconnected network of smaller pores. A theory developed to describe solvent diffusion within ordered arrays of polymer spheres is applied to understand the diffusion of nonadsorbing polystyrene within hierarchically structured particles as measured by pulsed-field gradient NMR. The model captures an important feature of the data - diffusivity within the particles will be most significantly reduced for a molecule of intermediate size due to the interplay of partitioning and diffusion within the network of smaller pores. While the measured values differ from those predicted by the model, the differences are attributed to assumptions made in describing diffusion and partitioning within the microparticles. (C)2000 Academic Press.

Original languageEnglish (US)
Pages (from-to)277-285
Number of pages9
JournalJournal of Colloid And Interface Science
Volume226
Issue number2
DOIs
StatePublished - Jun 15 2000

Bibliographical note

Funding Information:
This work was supported by Grant GM45988 from the National Institute of Health. D.H.R recognizes the support of the National Institute of General Medical Science through a Biotechnology Training Fellowship (IT32-GM08347).

Keywords

  • Colloidal aggregates
  • Diffusion
  • Porous media
  • Tortuosity

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