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Issue 5, 2013
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Dynamic arrest in model porous media—intermediate scattering functions

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Abstract

Heterogeneous media constitute random disordered environments where transport is drastically hindered. Employing extensive molecular dynamics simulations, we investigate the spatio-temporal dynamics of tracer particles in the Lorentz model in the vicinity of the localization transition. There transport becomes anomalous and non-gaussian due to the presence of self-similar spatial structures, and dynamic scaling behavior is anticipated. The interplay of different time and length scales is revealed by the intermediate scattering functions, which are sensitive both to the underlying spatial fractal as well as the anomalous transport. We compare our numerical results in the transition regime to a mode-coupling approach, and find that certain aspects are surprisingly well predicted.

Graphical abstract: Dynamic arrest in model porous media—intermediate scattering functions

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Article information


Submitted
05 Sep 2012
Accepted
07 Nov 2012
First published
10 Dec 2012

Soft Matter, 2013,9, 1604-1611
Article type
Paper

Dynamic arrest in model porous media—intermediate scattering functions

M. Spanner, S. K. Schnyder, F. Höfling, T. Voigtmann and T. Franosch, Soft Matter, 2013, 9, 1604 DOI: 10.1039/C2SM27060A

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