Masked edge effects when measuring diffusion coefficients with the cup method

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Abstract

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.

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Subject classification (UKÄ) – MANDATORY

  • Materials Engineering
  • Building Technologies
Original languageEnglish
Pages (from-to)821-826
JournalPolymer Engineering and Science
Volume34
Issue number10
Publication statusPublished - 1994
Publication categoryResearch
Peer-reviewedYes