학술논문
On the problem of field-gradient NMR measurements of intracrystalline diffusion in small crystallites - Water in NaA zeolites as an example
Document Type
Report
Author
Source
Solid State Nuclear Magnetic Resonance. Sept, 2005, Vol. 28 Issue 2-4, p244, 6 p.
Subject
Language
English
ISSN
0926-2040
Abstract
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.ssnmr.2005.10.011 Byline: Aleksander Gutsze (a), Wlodzimierz Masierak (b), Burkhard Geil (c), Danuta Kruk (d)(e), Hannes Pahlke (d), Franz Fujara (d) Keywords: Zeolites; Diffusion; Field-gradient NMR 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[mu]m) have been measured by.sup.1H-NMR stimulated echoes in static magnetic field gradients of up to 180T/m in the temperature range of 254-344K. Obtaining intracrystalline diffusion coefficients necessitates a sufficiently high spatial resolution only provided by such large field gradients. Author Affiliation: (a) Medical Academy of Bydgoszcz, Department of Biophysics, ul. Jagiellonska 13, PL-85-067 Bydgoszcz, Poland (b) Academy of Bydgoszcz, Plac Weyssenhoffa 11, PL-85-072 Bydgoszcz, Poland (c) Fachbereich Physik, Universitat Dortmund, Otto-Hahn StraAe 4, D-44221 Dortmund, Germany (d) Fachbereich Physik, TU Darmstadt, HochschulstraAe 6, D-64289 Darmstadt, Germany (e) Institute of Physics, Jagiellonian University, Reymonta 4, PL-30059 Krakow, Poland Article History: Received 2 June 2005