4.7 Article

Particle size effect on diffusion in tubes with dead ends: Nonmonotonic size dependence of effective diffusion constant

Journal

JOURNAL OF CHEMICAL PHYSICS
Volume 129, Issue 18, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.3010709

Keywords

diffusion; particle size

Funding

  1. CONACyT [52305]
  2. Russian Foundation for Basic Research [06-0332373]
  3. NIH
  4. Center for Information Technology

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Diffusion of a spherical particle of radius r in a tube with identical periodic dead ends is analyzed. It is shown that the effective diffusion constant follows the Stokes-Einstein relation, D-eff(r)proportional to 1/r, only when r is larger or much smaller than the radius of the dead end entrance. In between, D-eff(r) not only deviates from the 1/r behavior but may also even become a nonmonotonic function, which increases with the particle radius for a certain range of r.

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