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 alpha, 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 a 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.

Structural disorder and anomalous diffusion in random packing of spheres / Palombo, Marco; A., Gabrielli; Servedio, VITO DOMENICO PIETRO; Ruocco, Giancarlo; Capuani, Silvia. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 3:(2013), p. 2631. [10.1038/srep02631]

Structural disorder and anomalous diffusion in random packing of spheres

PALOMBO, Marco;SERVEDIO, VITO DOMENICO PIETRO;RUOCCO, Giancarlo;CAPUANI, Silvia
2013

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 alpha, 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 a 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.
2013
01 Pubblicazione su rivista::01a Articolo in rivista
Structural disorder and anomalous diffusion in random packing of spheres / Palombo, Marco; A., Gabrielli; Servedio, VITO DOMENICO PIETRO; Ruocco, Giancarlo; Capuani, Silvia. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 3:(2013), p. 2631. [10.1038/srep02631]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/645306
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