Abstract
A detailed description of the application of interference microscopy to measure intracrystalline transport diffusion in zeolites is given. It is demonstrated how phase differences as the primary data of interference microscopy may be transferred into information about intracrystalline concentration profiles and their evolution with time. As an example, molecular uptake of methanol in zeolite NaCaA is considered. The concentration profiles along the crystallite diagonal are given at different instants of time. Finally, the range of diffusivities obtained by applying the microscopic version of Fick's second law to the concentration data is presented.
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