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Masked edge effects when measuring diffusion coefficients with the cup method
Author(s) -
Claesson J.,
Hagentoft C.E.,
Wadsö L.
Publication year - 1994
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760341007
Subject(s) - masking (illustration) , diffusion , materials science , enhanced data rates for gsm evolution , simple (philosophy) , effective diffusion coefficient , sample (material) , computational physics , computer science , thermodynamics , physics , telecommunications , medicine , art , philosophy , epistemology , radiology , magnetic resonance imaging , visual arts
When diffusion coefficients are measured with the cup method, the exposed area is often less than the area of the sample. Because of this masking effect the measured diffusion coefficient is overestimated. The present article presents simple formulas based on two‐dimensional analytical solutions to correct for this in cylindrical cup samples. Different cases of anisotropical diffusion are dealt with. The error in the analytical solutions is determined by numerical computer simulations.