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| Titel |
Relaxation-relaxation exchange experiments in porous media with portable Halbach-Magnets. |
| VerfasserIn |
A. Haber, S. Haber-Pohlmeier, F. Casanova, B. Blümich |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027330
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| Zusammenfassung |
| Mobile NMR became a powerful tool following the development of portable NMR sensors
for well logging. By now there are numerous applications of mobile NMR in materials
analysis and chemical engineering where, for example, unique information about the
structure, morphology and dynamics of polymers is obtained, and new opportunities are
provided for geo-physical investigations [1]. In particular, dynamic information can
be retrieved by two-dimensional Laplace exchange NMR, where the initial NMR
relaxation environment is correlated with the final relaxation environment of molecules
migrating from one environment to the other within a so-called NMR mixing time tm
[2].
Relaxation-relaxation exchange experiments of water in inorganic porous media were
performed at low and moderately inhomogeneous magnetic field with a simple, portable
Halbach-Magnet. By conducting NMR transverse relaxation exchange experiments
for several mixing times and converting the results to 2D T2 distributions (joint
probability densities of transverse relaxation times T2) with the help of the inverse
2D Laplace Transformation (ILT), we obtained characteristic exchange times for
different pore sizes. The results of first experiments on soil samples are reported,
which reveal information about the complex pore structure of soil and the moisture
content.
References:
1. B. Blümich, J. Mauler, A. Haber, J. Perlo, E. Danieli, F. Casanova, Mobile NMR for
Geo-Physical Analysis and Material Testing, Petroleum Science, xx (2009) xxx -
xxx.
2. K. E. Washburn, P.T. Callaghan, Tracking pore to pore exchange using relaxation exchange
spectroscopy, Phys. Rev. Lett. 97 (2006) 175502. |
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