Early-time wetting kinetics in surface-directed spinodal decomposition for off-critical quenches: A molecular dynamics study
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866917751452336128 |
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| author | Zaidi, Syed Shuja Hasan Suvarna, Saumya Priya, Madhu Puri, Sanjay Jaiswal, Prabhat K. |
| author_facet | Zaidi, Syed Shuja Hasan Suvarna, Saumya Priya, Madhu Puri, Sanjay Jaiswal, Prabhat K. |
| contents | 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 $V(z)= -ε_a/z^{n}$, with $ε_{a}$ 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 $ε_{a}$, we recover $1/(n+2)$ for a minority wetting case. We provide phenomenological arguments to explain the early-time wetting kinetics for both cases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_08800 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Early-time wetting kinetics in surface-directed spinodal decomposition for off-critical quenches: A molecular dynamics study Zaidi, Syed Shuja Hasan Suvarna, Saumya Priya, Madhu Puri, Sanjay Jaiswal, Prabhat K. Soft Condensed Matter Statistical Mechanics 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 $V(z)= -ε_a/z^{n}$, with $ε_{a}$ 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 $ε_{a}$, we recover $1/(n+2)$ for a minority wetting case. We provide phenomenological arguments to explain the early-time wetting kinetics for both cases. |
| title | Early-time wetting kinetics in surface-directed spinodal decomposition for off-critical quenches: A molecular dynamics study |
| topic | Soft Condensed Matter Statistical Mechanics |
| url | https://arxiv.org/abs/2408.08800 |