Issue |
Europhys. Lett.
Volume 46, Number 2, April II 1999
|
|
---|---|---|
Page(s) | 204 - 210 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i1999-00245-y | |
Published online | 01 September 2002 |
Monitoring the evolution of intracrystalline concentration
1
Universität Leipzig,
Fakultät für Physik und Geowissenschaften
Linnéstraße 5, D-04103 Leipzig, Germany
2
Universität Stuttgart, Institut für
Technische Chemie I
D-70550 Stuttgart, Germany
Received:
30
October
1998
Accepted:
1
February
1999
Interference microscopy is applied to monitor the evolution of concentration profiles in zeolite crystallites during molecular uptake. Experiments of this type allow the microscopic observation of guest diffusion in host matrices under non-equilibrium conditions. For zeolites of type NaCaA, comparison of the thus determined diffusivities with the results of pulsed field gradient NMR self-diffusion studies, i.e. with the results of the corresponding equilibrium measurements, yields satisfactory agreement.
PACS: 66.33.-h – Diffusion in solids / 82.20.Mj – Nonequilibrium kinetics / 42.25.Hz – Optics: Interference
© EDP Sciences, 1999
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