Measurements of clathrate-hydrate film thickness using laser interferometry

Ryo Ohmura, Shigetoyo Kashiwazaki, Yasuhiko H. Mori

研究成果: Article

60 引用 (Scopus)

抄録

Using a laser interferometer having a resolution of approximately 1 μm, we directly measured the thicknesses of clathrate-hydrate films at the planar interface between a liquid hydrofluorocarbon, R-134a (CH2FCF3), and liquid water. The interferometer was mounted on a specially designed, pressure- and temperature-controlled cell filled with both liquids. After a hydrate film was formed with either pure water having no prior contact with R-134a or water presaturated with R-134a, we made a series of intermittent measurements until the film was aged up to 150 h. For hydrate films formed with pure water held at a large subcooling (approximately 7 K) below the triple (liquid-R-134a/hydrate/liquid-water) equilibrium temperature, the initial thickness was approximately 10 μm. This thickness was maintained for a few tens of hours; then it gradually increased, reaching approximately 30 μm 100 h after the film formed. With pure water at a smaller subcooling (≲2 K), the thickness of hydrate films was initially as large as approximately 80 μm; it rapidly decreased to 15-20 μm and then increased to 30-40 μm 150 h after the film formed. With presaturated water at small subcoolings (≲2 K), each hydrate film was a mosaic of polygonal hydrate crystal plates. Each plate was several millimeters wide and 20-170 μm thick. No measurement could be made with presaturated water at a large subcooling (≳6 K) because of sword-like hydrate crystals that have grown in crowds into the water phase from the hydrate film surface.

元の言語English
ページ(範囲)372-380
ページ数9
ジャーナルJournal of Crystal Growth
218
発行部数2
DOI
出版物ステータスPublished - 2000 9 15

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Laser interferometry
laser interferometry
clathrates
norflurane
Hydrates
hydrates
Film thickness
film thickness
Water
water
Liquids
liquids
Interferometers
interferometers
Crystals
crystals
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

これを引用

Measurements of clathrate-hydrate film thickness using laser interferometry. / Ohmura, Ryo; Kashiwazaki, Shigetoyo; Mori, Yasuhiko H.

:: Journal of Crystal Growth, 巻 218, 番号 2, 15.09.2000, p. 372-380.

研究成果: Article

Ohmura, Ryo ; Kashiwazaki, Shigetoyo ; Mori, Yasuhiko H. / Measurements of clathrate-hydrate film thickness using laser interferometry. :: Journal of Crystal Growth. 2000 ; 巻 218, 番号 2. pp. 372-380.
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