Palombo, M;
Gabrielli, A;
De Santis, S;
Cametti, C;
Ruocco, G;
Capuani, S;
(2011)
Spatio-temporal anomalous diffusion in heterogeneous media by nuclear magnetic resonance.
The Journal of Chemical Physics
, 135
(3)
, Article 034504. 10.1063/1.3610367.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Spatio-temporal anomalous diffusion in heterogeneous media by nuclear magnetic resonance |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.3610367 |
| Publisher version: | https://doi.org/10.1063/1.3610367 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10074395 |
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