Surface-Directed Spinodal Decomposition: A Molecular Dynamics Study

We use molecular dynamics (MD) simulations to study surface-directed spinodal decomposition (SDSD) in unstable binary ($AB$) fluid mixtures at wetting surfaces. The thickness of the wetting layer $R_1$ grows with time $t$ as a power-law ($R_1 \sim t^θ$). We find that hydrodynamic effects result in a crossover of the growth exponent from $θ\simeq 1/3$ to $θ\simeq1$. We also present results for the layer-wise correlation functions and domain length scales.

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