𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Microstructure of porous media probed by NMR techniques in sub-micrometer length scales

✍ Scribed by Rainer Kimmich; Siegfried Stapf; Paul Callaghan; Andrew Coy

Book ID
103909873
Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
449 KB
Volume
12
Category
Article
ISSN
0730-725X

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✦ Synopsis

It is shown that field-cycling NMR relaxation spectroscopy in combination with pulsed-gradient spin-echo diffusion studies especially in the supercon fringe field version are suitable techniques for the investigation of length scales of porous media in the range 10 A to 10 Cm. Data for water adsorbed in fineparticle agglomerates, porous glass and ceramics are reported. An orientational structure factor is introduced permitting the characterization of hydrated surfaces on the basis of reorientations mediated by translational displacements of the adsorbed molecules. Known lengths such as the mean pore or particle size have been reproduced in this way. In length scales beyond these structural elements, the geometry of the internal surfaces can be discussed in terms of wavenumberspace fractals.

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