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• W4313592980 endingPage "1056" @default.
• W4313592980 startingPage "1044" @default.
• W4313592980 abstract "Clathrate hydrate nucleation in heterogeneous systems, such as the water-in-oil emulsions found in pipeline environments, is of considerable technological importance and scientific interest. While there has been a number of experimental studies investigating hydrate nucleation in water-in-oil emulsions, there have been essentially no molecular simulations to provide important molecular insights into the hydrate nucleation process. Here, we report extensive molecular dynamics simulations of gas hydrate nucleation to examine nucleation behavior in water nanodroplets immersed in a non-aqueous liquid, probing key factors impacting nucleation, including guest species, guest compositions, size of the nanodroplets, and temperature. The nucleation behavior with pure-guest (i.e., H2S, C3H8, and CO2) and H2S-containing mixtures, where the second guest species is one of C3H8, CH4, C2H6, and CO2, has been studied. For the various systems examined in this study, we find that H2S always tends to initiate hydrate formation, with the only exception being the H2S/CO2 mixture, where the relatively high solubility of H2S compared to the other guest species is identified as an important factor for the current systems. Three different sizes of water nanodroplets at different temperatures are used to examine hydrate nucleation with pure-H2S guest systems, where the observed mechanism of hydrate nucleation within nanodroplets exhibits behavior similar to that found in bulk counterparts. Within water nanodroplets, the hydrate nucleation process features the initial formation of amorphous solids, which can then be annealed into more recognizable hydrate-like structures. Detailed cage analyses provide insights into the impacts of temperature and the size of the water nanodroplet on the initial location and the induction time of hydrate nucleation. Our simulations improve the understanding of the molecular mechanism of clathrate hydrate nucleation in water-in-oil emulsions, thus helping the development of hydrate-related applications and exploitation." @default.
• W4313592980 created "2023-01-06" @default.
• W4313592980 creator A5021995184 @default.
• W4313592980 creator A5038669552 @default.
• W4313592980 creator A5073216396 @default.
• W4313592980 date "2023-01-04" @default.
• W4313592980 modified "2023-09-28" @default.
• W4313592980 title "Hydrate Nucleation in Water Nanodroplets: Key Factors and Molecular Mechanisms" @default.
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