Kinetics of Surface Enrichment: A Molecular Dynamics Study

Details Kinetics of Surface Enrichment: A Molecular Dynamics Study Kinetics of Surface Enrichment: A Molecular Dynamics Study

2010-11-29

arxiv.org/abs/1011.6290v1

J. Chem. Phys. 133, 154901 (2010)

Physics

Condensed Matter

Soft Condensed Matter

20 pages, 6 figures, Published in J. Chem. Phys. (Research Highlights)

Scientific paper

10.1063/1.3491833

We use molecular dynamics (MD) to study the kinetics of surface enrichment (SE) in a stable homogeneous mixture (AB), placed in contact with a surface which preferentially attracts A. The SE profiles show a characteristic double-exponential behavior with two length scales: \xi_-, which rapidly saturates to its equilibrium value, and \xi_+, which diverges as a power-law with time (\xi_+ \sim t^\theta). We find that hydrodynamic effects result in a crossover of the growth exponent from \theta \simeq 0.5 to \theta \simeq 1.0. There is also a corresponding crossover in the growth dynamics of the SE-layer thickness.

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