Abstract
Microscopic observations of the liquid CO 2-water-CO 2-hydrate system were conducted to measure both the interfacial tensions in these phases and the strength of the CO 2-hydrate film. Measurements on hanging drops revealed that the interfacial tension between liquid CO 2 and water decreased slightly as the temperature was raised from 266.3 to 284.9 K, and that the average of the interfacial tension was about 29 dyn-cm −1. Contact angles between a water droplet and a teflon plate were measured before and after the thin film of CO 2 hydrate was formed on the droplet. Comparisons of these contact angles indicated that the sums of the interfacial tensions between liquid CO 2 and CO 2-hydrate film and between CO 2-hydrate film and water were about 26% less than between liquid CO 2 and water. The destructive strength of CO 2-hydrate film formed on the pendant drop was examined by using a process for breaking of the film. Measurements indicated that the strength of the CO 2-hydrate film depended on the film thickness. The film thickness of CO 2 hydrate was then estimated from the film strength.
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