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Spatio-temporal anomalous diffusion in heterogeneous media by nuclear magnetic resonance

Palombo, M., Gabrielli, A., De Santis, Silvia, Cametti, C., Ruocco, G. and Capuani, S. 2011. Spatio-temporal anomalous diffusion in heterogeneous media by nuclear magnetic resonance. The Journal of Chemical Physics 135 (3) , 034504. 10.1063/1.3610367

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In this paper, we describe nuclear magnetic resonance measurements of water diffusion in highly confined and heterogeneous colloidal systems using an anomalous diffusion model. For the first time, temporal and spatial fractional exponents, α and μ, introduced within the framework of continuous time random walk, are simultaneously measured by pulsed gradient spin-echo NMR technique in samples of micro-beads dispersed in aqueous solution. In order to mimic media with low and high level of disorder, mono-dispersed and poly-dispersed samples are used. We find that the exponent α depends on the disorder degree of the system. Conversely, the exponent μ depends on both bead sizes and magnetic susceptibility differences within samples. The new procedure proposed here may be a useful tool to probe porous materials and microstructural features of biological tissue.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: colloids, diffusion, magnetic susceptibility, nuclear magnetic resonance, porous materials, spatiotemporal phenomena, spin echo (NMR)
Additional Information: 7 pages. Pdf uploaded in accordance with publisher's policy at (accessed 21/02/2014)
Publisher: American Institute of Physics
ISSN: 0021-9606
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 04:02

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