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Structural disorder and anomalous diffusion in random packing of spheres

Palombo, M; Gabrielli, A; Servedio, VDP; Ruocco, G; Capuani, S; (2013) Structural disorder and anomalous diffusion in random packing of spheres. Scientific Reports , 3 (1) , Article 2631. 10.1038/srep02631. Green open access

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Abstract

Nowadays Nuclear Magnetic Resonance diffusion (dNMR) measurements of water molecules in heterogeneous systems have broad applications in material science, biophysics and medicine. Up to now, microstructural rearrangement in media has been experimentally investigated by studying the diffusion coefficient (D(t)) behavior in the tortuosity limit. However, this method is not able to describe structural disorder and transitions in complex systems. Here we show that, according to the continuous time random walk framework, the dNMR measurable parameter α, quantifying the anomalous regime of D(t), provides a quantitative characterization of structural disorder and structural transition in heterogeneous systems. To demonstrate this, we compare α measurements obtained in random packed monodisperse micro-spheres with Molecular Dynamics simulations of disordered porous media and 3D Monte Carlo simulation of particles diffusion in these kind of systems. Experimental results agree well with simulations that correlate the most used parameters and functions characterizing the disorder in porous media.

Type: Article
Title: Structural disorder and anomalous diffusion in random packing of spheres
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/srep02631
Publisher version: https://doi.org/10.1038/srep02631
Language: English
Additional information: © 2013 the Authors. This work is licensed under a Creative Commons AttributionNonCommercial-NoDerivs 3.0 Unported license. To view a copy of this license, visit (http://creativecommons.org/licenses/by-nc-nd/3.0).
Keywords: Applied physics, Colloids, Phase transitions and critical phenomena, Rheology
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/10074396
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