MASKED EDGE EFFECTS WHEN MEASURING DIFFUSION-COEFFICIENTS WITH THE CUP METHOD

Authors
CLAESSON J HAGENTOFT CE WADSO L
Citation
J. Claesson et al., MASKED EDGE EFFECTS WHEN MEASURING DIFFUSION-COEFFICIENTS WITH THE CUP METHOD, Polymer engineering and science, 34(10), 1994, pp. 821-826
Citations number
8
Categorie Soggetti
Polymer Sciences","Engineering, Chemical
Journal title
Polymer engineering and science → ACNP
ISSN journal
00323888
Volume
34
Issue
10
Year of publication
1994
Pages
821 - 826
Database
ISI
SICI code
0032-3888(1994)34:10<821:MEEWMD>2.0.ZU;2-H
Abstract
When diffusion coefficients are measured with the cup method, the expo sed area is often less than the area of the sample. Because of this ma sking effect the measured diffusion coefficient is overestimated. The present article presents simple formulas based on two-dimensional anal ytical solutions to correct for this in cylindrical cup samples. Diffe rent cases of anisotropical diffusion are dealt with. The error in the analytical solutions is determined by numerical computer simulations.