Microsc. Microanal. Microstruct.
Volume 7, Number 1, February 1996
|Page(s)||49 - 63|
X-ray Microradiographic Determination of Diffusion Coefficients within Porous Media Based on Fick's 2nd Law: Theory and Error AnalysisStephanie E. R. Dowker1, Paul Anderson2 et James C. Elliott2
1 Department of Conservative Dentistry, Faculty of Clinical Dentistry, Queen Mary and Westfield College, Turner Street, London E1 2AD, U.K.
2 Department of Biophysics in Relation to Dentistry, Faculty of Clinical Dentistry, Queen Mary and Westfield College, Turner Street, London E1 2AD, U.K.
A method based on Fick's 2nd Law is described for the determination of local effective diffusion coefficients, within porous media, from X-ray absorption measurements. Numerical methods were used to simulate concentrations and corresponding X-ray absorption data during diffusion of an X-ray absorbing species within the fluid phase. Errors arising from X-ray counting statistics were investigated analytically and by Monte Carlo simulations. The influence of experimental conditions on errors is discussed.
4755M - Flow through porous media.
6610C - Diffusion and thermal diffusion in liquids.
0785 - X ray, gamma ray instruments and techniques.
diffusion -- flow through porous media -- Monte Carlo methods -- porous materials -- radiography -- X ray absorption -- X ray microradiographic determination -- error analysis -- Fick's 2nd Law -- local effective diffusion coefficients -- porous media -- X ray absorption -- fluid phase -- Monte Carlo simulations
© EDP Sciences 1996