Evidence for Unusual Dynamical Arrest Scenario in Short Ranged Colloidal Systems

Details Evidence for Unusual Dynamical Arrest Scenario in Short Ranged Colloidal Systems Evidence for Unusual Dynamical Arrest Scenario in Short Ranged Colloidal Systems

2002-01-21

arxiv.org/abs/cond-mat/0201372v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevE.65.050802

Extensive molecular dynamics simulation studies of particles interacting via a short ranged attractive square-well (SW) potential are reported. The calculated loci of constant diffusion coefficient $D$ in the temperature-packing fraction plane show a re-entrant behavior, i.e. an increase of diffusivity on cooling, confirming an important part of the high volume-fraction dynamical-arrest scenario earlier predicted by theory for particles with short ranged potentials. The more efficient localization mechanism induced by the short range bonding provides, on average, additional free volume as compared to the hard-sphere case and results in faster dynamics.

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