Slow dynamics of a confined supercooled binary mixture: direct space analysis

Details Slow dynamics of a confined supercooled binary mixture: direct space analysis Slow dynamics of a confined supercooled binary mixture: direct space analysis

2003-02-14

arxiv.org/abs/cond-mat/0302298v1

Phys. Rev. E 67, 041202 (2003)

Physics

Condensed Matter

Soft Condensed Matter

8 pages with 12 figures. RevTeX. Accepted for publication in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.67.041202

Dynamical properties of a Lennard-Jones binary mixture embedded in an off lattice matrix of soft spheres are studied in the direct space upon supercooling by molecular dynamics simulations. On lowering temperature the smaller particles tend to avoid the soft sphere interfaces and correspondingly their mobility decreases below the one of the larger particles. The system displays a dynamic behaviour consistent with the Mode Coupling predictions. A decrease of the mode coupling crossover temperature with respect to the bulk is found. We find however that the range of validity of the theory shrinks with respect to the bulk. This is due to the change in the smaller particle mobility and to a substantial enhancement of hopping processes well above the cross over temperature upon confinement.

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