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dc.contributor.author
Farrher, German David
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dc.contributor.author
Ardelean, I.
dc.contributor.author
Kimmich, R.
dc.date.available
2024-08-08T14:36:21Z
dc.date.issued
2008-08
dc.identifier.citation
Farrher, German David; Ardelean, I.; Kimmich, R.; Time-Dependent Molecular Diffusion in Partially Filled Porous Glasses with Heterogeneous Structure; Springer Wien; Applied Magnetic Resonance; 34; 1-2; 8-2008; 85-99
dc.identifier.issn
0937-9347
dc.identifier.uri
http://hdl.handle.net/11336/242131
dc.description.abstract
Nuclear magnetic resonance (NMR) microscopy of silica glasses with micrometer pores (Vitrapor#5) partially filled with water or cyclohexane reveals a heterogeneous distribution of liquid on a length scale much longer than the pore dimension. This heterogeneity, which is not observed in MR imaging of saturated samples, is attributed to the spatial variation of the granular microstructure visible in scanning electron micrographs. As a consequence of an inhomogeneous filling degree, the effective transverse relaxation time varies, which in turn leads to NMR imaging contrasts. Since the spatial distribution of the transverse relaxation time prevents reliable measurements with a standard pulsed gradient stimulated echo technique, a combination of the fringe field stimulated echo method, on the one hand, and the magnetization grid rotating-frame imaging technique, on the other, was employed. Four decades of the diffusion time from 100 ms to 1 s can be covered on this basis. The data were compared with Monte Carlo simulations of a model structure showing a qualitatively equivalent behavior in the common time window. The self-diffusion in partially filled porous systems is known to be strongly affected by a vapor phase. Here we have shown that the vapor phase contribution to the effective diffusivity is particularly efficient on a diffusion time scale corresponding to mean-squares displacements of the order of the pore dimension.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer Wien
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Nuclear magnetic resonance
dc.subject
Diffusion
dc.subject
Porous Glasses
dc.subject.classification
Física Atómica, Molecular y Química
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Time-Dependent Molecular Diffusion in Partially Filled Porous Glasses with Heterogeneous Structure
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-08-07T11:19:12Z
dc.journal.volume
34
dc.journal.number
1-2
dc.journal.pagination
85-99
dc.journal.pais
Austria
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dc.journal.ciudad
Viena
dc.description.fil
Fil: Farrher, German David. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
dc.description.fil
Fil: Ardelean, I.. Technical University of Cluj-Napoca; Rumania
dc.description.fil
Fil: Kimmich, R.. Universitat Ulm; Alemania
dc.journal.title
Applied Magnetic Resonance
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s00723-008-0096-6
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s00723-008-0096-6
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