Growth of Clathrate Hydrates from Water Drops in Cyclopentane
Résumé
Clathrate hydrates are icelike crystalline compounds with encaged guest molecules trapped inside the cages of hydrogen bonded water molecules. Their growth is visualized for cyclopentane within water drops of two microliters on glass and poly-tetrafluoroethylene surfaces. The effect of the interfacial tension between water and cyclopentane is measured at different temperatures and for different concentration of an oil-soluble surfactant: sorbitan monooleate (Span 80). The drops experience a temperature sequence where they freeze into ice, form hydrates and melt. Cyclopentane hydrates crystals are affected by the concentration of surfactant. The morphology seen here could be relevant for explaining the behavior of hydrate emulsions.
Domaines
Sciences de l'ingénieur [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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