A multi-dimensional experiment for characterization of pore structure heterogeneity using NMR

Journal of Magnetic Resonance
Rhiannon T Lewis, John Georg Seland

Abstract

In a liquid saturated porous sample the spatial inhomogeneous internal magnetic field in general depends on the strength of the static magnetic field, the differences in magnetic susceptibilities, but also on the geometry of the porous network. To thoroughly investigate how the internal field can be used to determine various properties of the porous structure, we present a novel multi-dimensional NMR experiment that enables us to measure several dynamic correlations in one experiment, and where all of the correlations involve the internal magnetic field and its dependence on the geometry of the porous network. (Correlations: internal gradient - pore size, internal gradient - magnetic susceptibility difference, internal gradient - longitudinal relaxation, longitudinal relaxation - magnetic susceptibility difference.) It is always a spatial average of the internal magnetic field, or one of the related properties, that is measured, which is important to take into consideration when analyzing the obtained results. We demonstrate how these correlations can be an indicator for pore structure heterogeneity, and focus in particular on how the effect from spatial averaging can be evaluated and taken into account in the different cases.

References

May 8, 1998·Journal of Magnetic Resonance·M D Hürlimann
Mar 15, 1992·Physical Review. a·G C Barker, A Mehta
Jun 13, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Boqin Sun, Keh-Jim Dunn
Dec 17, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·John Georg SelandJostein Krane
Mar 1, 2012·Journal of Magnetic Resonance·Lauren M Burcaw, Paul T Callaghan
Feb 18, 2014·Journal of Magnetic Resonance·Jonathan Mitchell
Dec 17, 2014·The Journal of Chemical Physics·J Mitchell, T C Chandrasekera

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Citations

Apr 26, 2016·Journal of Magnetic Resonance·Yan ZhangBernhard Blümich
Apr 24, 2021·Journal of Magnetic Resonance·Aina Marie Løkkevik Bratland, John Georg Seland

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