Article

Molecular dynamics study of phase separation kinetics in thin films.

Institut für Physik, Johannes Gutenberg-Universität, D-55099 Mainz, Staudinger Weg 7, Germany.
Physical Review Letters (impact factor: 7.37). 02/2006; 96(1):016107. pp.016107
Source: PubMed

ABSTRACT We use molecular dynamics to simulate experiments where a symmetric binary fluid mixture (AB), confined between walls that preferentially attract one component (A), is quenched from the one-phase region into the miscibility gap. Surface enrichment occurs during the early stages, yielding a B-rich mixture in the film center with well-defined A-rich droplets. The droplet size grows with time as l(t) proportional t(2/3) after a transient regime. The present atomistic model is also compared to mesoscopic coarse-grained models for this problem.

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Keywords

B-rich mixture
 
droplet size
 
one-phase region
 
preferentially
 
simulate experiments
 
Surface enrichment
 
symmetric binary fluid mixture
 
walls
 
well-defined A-rich droplets