Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 210, Issue 1, Pages 141-145Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2011.02.011
Keywords
Diffusion; Dispersion; Effective medium; Oscillating gradients; Surface-to-volume ratio
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Restrictions to diffusion result in the dispersion of the bulk diffusion coefficient. We derive the exact universal high-frequency behavior of the diffusion coefficient in terms of the surface-to-volume ratio of the restrictions. This frequency dependence can be applied to quantify structure of complex samples with NMR using oscillating field gradients and static-gradient CPMG. We also demonstrate the inter-relations between different equivalent diffusion metrics, and describe how to calculate the effect of restrictions for arbitrary gradient waveforms. (C) 2011 Elsevier Inc. All rights reserved.
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