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On the problem of field-gradient NMR measurements of intracrystalline diffusion in small crystallites--water in NaA zeolites as an example |
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| Authors: | Gutsze Aleksander Masierak Wlodzimierz Geil Burkhard Kruk Danuta Pahlke Hannes Fujara Franz |
| Institution: | aMedical Academy of Bydgoszcz, Department of Biophysics, ul. Jagiellonska 13, PL-85-067 Bydgoszcz, Poland bAcademy of Bydgoszcz, Plac Weyssenhoffa 11, PL-85-072 Bydgoszcz, Poland cFachbereich Physik, Universität Dortmund, Otto-Hahn Straße 4, D-44221 Dortmund, Germany dFachbereich Physik, TU Darmstadt, Hochschulstraße 6, D-64289 Darmstadt, Germany eInstitute of Physics, Jagiellonian University, Reymonta 4, PL-30059 Krakow, Poland |
| Abstract: | Necessary conditions for measuring intracrystalline diffusion in small crystal size systems via field-gradient NMR are discussed. As an illustrative case self-diffusion coefficients of water adsorbed in NaA zeolites (average crystal diameter about 1 μm) have been measured by 1H-NMR stimulated echoes in static magnetic field gradients of up to 180 T/m in the temperature range of 254–344 K. Obtaining intracrystalline diffusion coefficients necessitates a sufficiently high spatial resolution only provided by such large field gradients. |
| Keywords: | Zeolites Diffusion Field-gradient NMR |
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