2024/08/16 by Syed Shuja Hasan Zaidi, Zaidi, Syed Shuja Hasan, Saumya Suvarna +7 · 2 citations
Physics and Astronomy · Earth and Planetary Sciences · #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #nanoparticles nucleation surface interactions
paper · pdf · doi:10.48550/arxiv.2408.08800
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)= -εa/zn, with εa being the surface-potential strength. The surface prefers `A' species to form the wetting layer. Its thickness [R1(t)] for the majority wetting (number of A-type particles [NA] > number of B-type particles [NB]), 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 (NA < NB), the growth exponent in R1(t) is less than 1/(n+2). Furthermore, on decreasing the field strength εa, we recover 1/(n+2) for a minority wetting case. We provide phenomenological arguments to explain the early-time wetting kinetics for both cases.