title: On the problem of field-gradient NMR measurements of intracrystalline diffusion in small crystallites--water in NaA zeolites as an example.
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 microm) 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.
authors.affiliation: Medical Academy of Bydgoszcz, Department of Biophysics, ul. Jagiellonska 13, PL-85-067 Bydgoszcz, Poland.
authors.forename: Aleksander
authors.initials: A
authors.lastname: Gutsze
authors.forename: Wlodzimierz
authors.initials: W
authors.lastname: Masierak
authors.forename: Burkhard
authors.initials: B
authors.lastname: Geil
authors.forename: Danuta
authors.initials: D
authors.lastname: Kruk
authors.forename: Hannes
authors.initials: H
authors.lastname: Pahlke
authors.forename: Franz
authors.initials: F
authors.lastname: Fujara