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• Cho, H
• Sigmund, E
• Song, Y
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• Cho, H
• Sigmund, E
• Song, Y
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• Cho, H
• Sigmund, E
• Song, Y

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

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

Hyung Joon Cho ^1,* , Eric E. Sigmund ²  and Yiqiao Song ^3,4

¹ School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea ² Department of Radiology, New York University, 660 First Avenue, New York, NY 10016, USA ³ Schlumberger-Doll Research, One Hampshire Street, Cambridge, MA 02139, USA ⁴ Athinoula A Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA 02215, USA

* Author to whom correspondence should be addressed.

Received: 16 March 2012; in revised form: 27 March 2012 / Accepted: 28 March 2012 / Published: 12 April 2012

(This article belongs to the Special Issue Diffusion in Micropores)

Download PDF Full-Text [1096 KB, uploaded 12 April 2012 09:46 CEST]

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

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