Abstract
IN free-boundary diffusion experiments a boundary between two solutions of different concentrations is formed in a cylindrical cell and the evolution with time of the concentration distribution is examined. For the evaluation of the diffusion coefficient from the experimental data several methods are available, for example, the moment method and the area method. In these methods the existence of an initially sharp boundary between the two solutions is in general presumed. However, it will be shown that the moment method is valid for very general boundary conditions, a fact that seems to have been overlooked in the past.
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References
Jost, W., Diffusion, 48 (Dr. D. Steinkopff Verlag, Darmstadt, 1957).
Kraus, G., J. Chem. Phys., 20, 200 (1952).
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VINK, H. Evaluation of Diffusion Coefficients in Free-boundary Diffusion Experiments. Nature 205, 73 (1965). https://doi.org/10.1038/205073a0
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DOI: https://doi.org/10.1038/205073a0
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