Electroosmosis in a finite cylindrical pore: Simple models of end effects

J. D. Sherwood*, M. Mao, S. Ghosal

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

A theoretical model of electroosmosis through a circular pore of radius a that traverses a membrane of thickness h is investigated. Both the cylindrical surface of the pore and the outer surfaces of the membrane are charged. When h ≫ a, end effects are negligible, and the results of full numerical computations of electroosmosis in an infinite pore agree with theory. When h = 0, end effects dominate, and computations again agree with analysis. For intermediate values of h/a, an approximate analysis that combines these two limiting cases captures the main features of computational results when the Debye length κ-1 is small compared with the pore radius a. However, the approximate analysis fails when κ-1 ≫ a, when the charge cloud due to the charged cylindrical walls of the pore spills out of the ends of the pore, and the electroosmotic flow is reduced. When this spilling out is included in the analysis, agreement with computation is restored.

Original languageEnglish (US)
Pages (from-to)9261-9272
Number of pages12
JournalLangmuir
Volume30
Issue number31
DOIs
StatePublished - Aug 12 2014

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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