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• W4313554992 abstract "Methane hydrates are important from a scientific and industrial perspective, and form by nucleation and growth from a supersaturated aqueous solution of methane. Molecular simulation is able to shed light on the process of homogeneous nucleation of hydrates, using straightforward molecular dynamics or rare event enhanced sampling techniques with atomistic and coarse grained force fields. In our previous work [Arjun, T. A. Berendsen, and P. G. Bolhuis, Proc. Natl. Acad. Sci. U. S. A. 116, 19305 (2019)], we performed transition path sampling (TPS) simulations using all atom force fields under moderate driving forces at high pressure, which enabled unbiased atomistic insight into the formation of methane hydrates. The supersaturation in these simulations was influenced by the Laplace pressure induced by the spherical gas reservoir. Here, we investigate the effect of removing this influence. Focusing on the supercooled, supersaturated regime to keep the system size tractable, our TPS simulations indicate that nuclei form amorphous structures below roughly 260 K and crystalline sI structures above 260 K. For these temperatures, the average transition path lengths are significantly longer than in our previous study, pushing the boundaries of what can be achieved with TPS. The temperature to observe a critical nucleus of certain size was roughly 20 K lower compared to a spherical reservoir due to the lower concentration of methane in the solution, yielding a reduced driving force. We analyze the TPS results using a model based on classical nucleation theory. The corresponding free energy barriers are estimated and found to be consistent with previous predictions, thus adding to the overall picture of the hydrate formation process." @default.
• W4313554992 created "2023-01-06" @default.
• W4313554992 creator A5028368972 @default.
• W4313554992 creator A5065938694 @default.
• W4313554992 date "2023-01-28" @default.
• W4313554992 modified "2023-09-30" @default.
• W4313554992 title "Homogeneous nucleation of crystalline methane hydrate in molecular dynamics transition paths sampled under realistic conditions" @default.
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• W4313554992 doi "https://doi.org/10.1063/5.0124852" @default.
• W4313554992 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36725504" @default.
• W4313554992 hasPublicationYear "2023" @default.
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