期刊
CRYSTAL GROWTH & DESIGN
卷 9, 期 5, 页码 2529-2536出版社
AMER CHEMICAL SOC
DOI: 10.1021/cg9001048
关键词
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资金
- Japan Society for the Promotion of Science [19760137]
- Ministry of Education, Culture, Sport, and Technology in Japan
- Grants-in-Aid for Scientific Research [19760137] Funding Source: KAKEN
This paper reports the visual observations of the formation and growth of clathrate hydrate crystals on the surface of a water droplet exposed to gaseous methane, ethane, or propane. The hydrate crystals formed and grew at the guest-water interface. The nucleation of the hydrate first Occurred at a random point on the water droplet and then grew to form a polycrystalline layer covering the Surface. We observed the individual crystals that constitute the polycrystalline hydrate layer and classified the morphology of the hydrate crystals depending on the system subcooling Delta T-sub, the difference between the system temperature and the guest-hydrate-water three-phase equilibrium temperature corresponding to the system pressure. As a general trend, at Delta T-sub >= 3.0 K, the shape of hydrate crystals is typically swordlike or triangular, and the shape changes to a polygon at Delta T-sub from 2.0 to 3.0 K, and then to larger-sized polygons with one side of the polygon typically 0.5-1.0 mm in length. It may be concluded that the crystal morphology of the hydrate crystals formed at the interface between the liquid water and methane, ethane or propane gas can be classified using Delta T-sub as the common criterion. The lateral growth rate of the hydrate crystal were also measured and presented.
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