# Early-time wetting kinetics in surface-directed spinodal decomposition for off-critical quenches: A molecular dynamics study

Source: [Early-time wetting kinetics in surface-directed spinodal decomposition for off-critical quenches: A molecular dynamics study](<https://www.sota2.com/research/paper/68fa47c41e209131ce92a88e>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:54:48.911Z

Authors: Syed Shuja Hasan Zaidi, Saumya Suvarna, Madhu Priya, Sanjay Puri, Prabhat K. Jaiswal

Published: 2024-08-16T15:19:29.000Z

## Abstract

We present results from the molecular dynamics (MD) simulation of surface-directed spinodal decomposition (SDSD) in binary fluid mixtures ($A+B$) with off-critical compositions. The aim is to elucidate the role of composition ratio in the early-time wetting kinetics under the influence of long-range surface potential. In our simulations, the attractive part of surface potential varies as $V(z)= -\\epsilon\_a/z^{n}$, with $\\epsilon\_{a}$ being the surface-potential strength. The surface prefers \`$A$' species to form the wetting layer. Its thickness \[$R\_1(t)$\] for the majority wetting (number of $A$-type particles \[$N\_A$\] \> number of $B$-type particles \[$N\_B$\]), grows as a power-law with an exponent $1/(n+2)$. This is consistent with the early-time kinetics in the form of potential-dependent growth present in the Puri-Binder model. However, for minority wetting ($N\_A$ \< $N\_B$), the growth exponent in $R\_1(t)$ is less than $1/(n+2)$. Furthermore, on decreasing the field strength $\\epsilon\_{a}$, we recover $1/(n+2)$ for a minority wetting case. We provide phenomenological arguments to explain the early-time wetting kinetics for both cases.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2408.08800>)

[PDF](<https://arxiv.org/pdf/2408.08800.pdf>)