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Materials 2012, 5(4), 590-616; doi:10.3390/ma5040590
Review

Magnetic Resonance Characterization of Porous Media Using Diffusion through Internal Magnetic Fields

1,* , 2
 and
3,4
Received: 16 March 2012 / Revised: 27 March 2012 / Accepted: 28 March 2012 / Published: 12 April 2012
(This article belongs to the Special Issue Diffusion in Micropores)
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Abstract

When a porous material is inserted into a uniform magnetic field, spatially varying fields typically arise inside the pore space due to susceptibility contrast between the solid matrix and the surrounding fluid. As a result, direct measurement of the field variation may provide a unique opportunity to characterize the pore geometry. The sensitivity of nuclear magnetic resonance (NMR) to inhomogeneous field variations through their dephasing effects on diffusing spins is unique and powerful. Recent theoretical and experimental research sheds new light on how to utilize susceptibility-induced internal field gradients to quantitatively probe the microstructure of porous materials. This article reviews ongoing developments based on the stimulated echo-pulse sequence to extend the characterization of porous media using both spatially resolved and unresolved susceptibility-induced internal gradients that operate on a diffusing-spin ensemble.
Keywords: gradients; susceptibility; diffusion; decay due to diffusion in the internal field (DDIF); porous media; trabecular bone gradients; susceptibility; diffusion; decay due to diffusion in the internal field (DDIF); porous media; trabecular bone
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Cho, H.J.; Sigmund, E.E.; Song, Y. Magnetic Resonance Characterization of Porous Media Using Diffusion through Internal Magnetic Fields. Materials 2012, 5, 590-616.

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