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Article
Tracer Counterpermeation Analysis of Diffusivity in Finite-length Nanopores with and without Single-file Dynamics
Physical Review E
  • David Ackerman, Iowa State University
  • James W. Evans, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
1-19-2017
DOI
10.1103/PhysRevE.95.012132
Abstract

We perform a tracer counterpermeation (TCP) analysis for a stochastic model of diffusive transport through a narrow linear pore where passing of species within the pore is inhibited or even excluded (single-file diffusion). TCP involves differently labeled but otherwise identical particles from two decoupled infinite reservoirs adsorbing into opposite ends of the pore, and desorbing from either end. In addition to transient behavior, we assess steady-state concentration profiles, spatial correlations, particle number fluctuations, and diffusion fluxes through the pore. From the profiles and fluxes, we determine a generalized tracer diffusion coefficient Dtr(x), at various positions x within the pore. Dtr(x) has a plateau value in the pore center scaling inversely with the pore length, but it is enhanced near the pore openings. The latter feature reflects the effect of fluctuations in adsorption and desorption, and it is also associated with a nontrivial scaling of the concentration profiles near the pore openings.

Comments

This article is from Physical Review E 95 (2017): 012132-1, doi: 10.1103/PhysRevE.95.012132. Posted with permission.

Copyright Owner
American Physical Society
Language
en
File Format
application/pdf
Citation Information
David Ackerman and James W. Evans. "Tracer Counterpermeation Analysis of Diffusivity in Finite-length Nanopores with and without Single-file Dynamics" Physical Review E Vol. 95 (2017) p. 012132-1 - 012132-12
Available at: http://works.bepress.com/james-evans/129/