eprintid: 10074395 rev_number: 22 eprint_status: archive userid: 608 dir: disk0/10/07/43/95 datestamp: 2019-07-08 14:18:24 lastmod: 2021-09-17 22:27:16 status_changed: 2019-07-08 14:18:24 type: article metadata_visibility: show creators_name: Palombo, M creators_name: Gabrielli, A creators_name: De Santis, S creators_name: Cametti, C creators_name: Ruocco, G creators_name: Capuani, S title: Spatio-temporal anomalous diffusion in heterogeneous media by nuclear magnetic resonance ispublished: pub divisions: UCL divisions: B04 divisions: C05 divisions: F48 note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. 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. date: 2011-07-21 date_type: published publisher: AIP Publishing official_url: https://doi.org/10.1063/1.3610367 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green article_type_text: Journal Article verified: verified_manual elements_id: 1658749 doi: 10.1063/1.3610367 language_elements: English lyricists_name: Palombo, Marco lyricists_id: MPALO05 actors_name: Palombo, Marco actors_id: MPALO05 actors_role: owner full_text_status: public publication: The Journal of Chemical Physics volume: 135 number: 3 article_number: 034504 issn: 1089-7690 citation: 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 <https://doi.org/10.1063/1.3610367>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10074395/8/Palombo_Spatio-temporal%20anomalous%20diffusion%20in%20heterogeneous%20media%20by%20nuclear%20magnetic%20resonance_VoR.pdf