- Author
-
Hubbard, J. B.
|
Nguyen, T.
|
Bentz, D.
- Title
- Model of Defect-Mediated Transport Through Amorphous Membranes.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
Journal of Chemical Physics,
Vol. 96,
No. 4,
3177-3182,
February 1992
- Keywords
-
membranes
|
algorithms
|
pore-length distribution
|
random-pore membranes
- Abstract
- We introduce a class of membrane diffusion models which consists of an impermeable slab punctured by transmembrane pores which are constructed by continuous random-walk algorithms. These formally infinite tortuosity models closely resemble low tortuosity models in their steady-state flux and total transient uptake. The sharpest contrast between random and homogeneous membranes is in the stretched exponential (subdiffusive) decay [equation] of the transient diffusive flux for the random-pore models vs simple exponential decay [equations] for homogeneous membranes.