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Dynamic heterogeneities and non-Gaussian behavior in two-dimensional randomly confined colloidal fluids

Simon K. Schnyder1,2,*, Thomas O. E. Skinner3, Alice L. Thorneywork3, Dirk G. A. L. Aarts3, Jürgen Horbach1,†, and Roel P. A. Dullens3,‡

  • 1Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf, Germany
  • 2Department of Chemical Engineering, Kyoto University, Kyoto 615-8510, Japan
  • 3Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom

  • *skschnyder@gmail.com
  • †horbach@thphy.uni-duesseldorf.de
  • ‡roel.dullens@chem.ox.ac.uk
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Phys. Rev. E 95, 032602 – Published 6 March, 2017

DOI: https://doi.org/10.1103/PhysRevE.95.032602

Abstract

A binary mixture of superparamagnetic colloidal particles is confined between glass plates such that the large particles become fixed and provide a two-dimensional disordered matrix for the still mobile small particles, which form a fluid. By varying fluid and matrix area fractions and tuning the interactions between the superparamagnetic particles via an external magnetic field, different regions of the state diagram are explored. The mobile particles exhibit delocalized dynamics at small matrix area fractions and localized motion at high matrix area fractions, and the localization transition is rounded by the soft interactions [T. O. E. Skinner et al., Phys. Rev. Lett. 111, 128301 (2013)]. Expanding on previous work, we find the dynamics of the tracers to be strongly heterogeneous and show that molecular dynamics simulations of an ideal gas confined in a fixed matrix exhibit similar behavior. The simulations show how these soft interactions make the dynamics more heterogeneous compared to the disordered Lorentz gas and lead to strong non-Gaussian fluctuations.

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Outline

Information

Phys. Rev. E 95, 032602– Published 6 March, 2017
  • Received 17 August 2016
  • Revised 10 February 2017

©2017 American Physical Society

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