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Molecular dynamics study of phase separation kinetics in thin films
Subir K Das1, Sanjay Puri, Jürgen Horbach
1Institut für Physik, Johannes Gutenberg-Universität, D-55099 Mainz, Staudinger Weg 7, Germany.
Physical Review Letters
|February 21, 2006
Summary
We simulated a binary fluid mixture (AB) confined between attractive walls. Surface enrichment and droplet formation were observed, with droplet size following a t(2/3) growth law.
Area of Science:
- Physical Chemistry
- Materials Science
- Computational Physics
Background:
- Understanding fluid behavior in confined geometries is crucial for materials science.
- Phase separation dynamics in binary mixtures are complex and influenced by surface interactions.
Purpose of the Study:
- To investigate the phase separation dynamics of a symmetric binary fluid mixture under confinement.
- To analyze the effects of preferential surface attraction on mixture morphology.
- To compare atomistic simulations with mesoscopic models.
Main Methods:
- Molecular dynamics simulations were employed to model the system.
- The simulation involved quenching a binary fluid mixture (AB) into its miscibility gap.
- Confining walls with preferential attraction to component A were utilized.
Main Results:
- Early-stage surface enrichment of component A was observed.
- A B-rich mixture formed in the film center, with distinct A-rich droplets.
- Droplet size exhibited a power-law growth, l(t) proportional t(2/3), after an initial transient period.
Conclusions:
- Preferential surface attraction drives significant structural changes in confined binary fluids.
- The observed droplet growth dynamics provide insights into early-stage phase separation.
- Atomistic simulations offer a detailed view, comparable to mesoscopic models, for studying such phenomena.