Thomas O. E. Skinner, Simon K. Schnyder, Dirk G. A. L. Aarts, Juergen Horbach, Roel P. A. Dullens
The dynamics of two-dimensional fluids confined within a random matrix of obstacles is investigated using both colloidal experiments and molecular dynamics simulations. By varying fluid and matrix area fractions in the experiment, we find delocalized tracer particle dynamics at small matrix area fractions and localized motion of the tracers at high matrix area fractions. In the delocalized region, the dynamics is diffusive at long times, while in the localized regime anomalous diffusion at intermediate times and trapping in finite pockets of the matrix is observed. These observations are found to agree with the simulation of an ideal gas confined in a weakly correlated matrix.
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http://arxiv.org/abs/1302.2896
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