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首页> 外文期刊>Crystal growth & design >Dynamics of methane-propane clathrate hydrate crystal growth from liquid water with or without the presence of n-heptane
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Dynamics of methane-propane clathrate hydrate crystal growth from liquid water with or without the presence of n-heptane

机译:有或没有正庚烷存在下液态水中甲烷丙烷笼形水合物晶体生长的动力学

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Methane-propane clathrate hydrate crystal growth within an enclosure partially filled with liquid water was examined under different undercooling conditions both with and without the presence of n-heptane. Water saturated with guest gas was rapidly undercooled and maintained at constant temperature. The growth of the hydrate phase always started with the formation of a film at the upper surface of the liquid water pool. The visual observations using a microscope revealed detailed features of crystal nucleation, migration, and growth occurring within the water pool. In all experiments, hydrate crystal growth was initiated by the formation of hydrate film at the interface between liquid water and the adjacent gas or n-heptane layer. Hydrate crystals were then observed to grow downward from the film. Undercooling was found to be a key parameter to control the morphology of hydrates growing underneath the hydrate film as it influences the growth rate and configurations of crystals. Moreover, a number of small crystals were seen in the water ascending toward the hydrate film. The evolution of the shape of these crystals was monitored. These crystals were octahedral or triangular or hexagonal platelets. Finally, the role of constitutional undercooling and the memory of the water to the observed crystal growth are discussed.
机译:在有和没有正庚烷的情况下,在不同的过冷条件下,检查了在部分充满液态水的封闭室内甲烷-丙烷笼形水合物晶体的生长情况。用客气饱和的水迅速过冷并保持在恒定温度。水合物相的生长总是始于在液态水池的上表面形成膜。使用显微镜进行的视觉观察揭示了水池中晶体成核,迁移和生长的详细特征。在所有实验中,水合物晶体的生长是通过在液态水与相邻气体或正庚烷层之间的界面处形成水合物膜来引发的。然后观察到水合物晶体从膜向下生长。发现过冷是控制水合物膜下方生长的水合物形态的关键参数,因为它会影响晶体的生长速率和晶体构型。此外,在水中观察到许多小的晶体朝水合物膜上升。监测这些晶体形状的演变。这些晶体是八面体或三角形或六边形的血小板。最后,讨论了组织过冷的作用以及水对观察到的晶体生长的记忆。

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