Add time:08/09/2019         Source:sciencedirect.com

The thermal conductivity of semiclathrate hydrates and aqueous solutions of Tetrabutylammonium bromide (cas 1643-19-2) (TBAB) and tetrabutylammonium chloride (TBAC) was measured for the first time in the temperature range from 223 to 303 K under atmospheric pressure. A transient hot-wire apparatus using a parylene-coated probe was employed for the measurements with an uncertainty of ±0.7%. The experimental results indicate that the thermal conductivity of two semiclathrate hydrates are smaller than those of two clathrate hydrates—about 80% of the THF hydrate and 60% of the CH4 hydrate—and are about a factor of 5.5 lower than that of ice Ih at temperatures near the melting point. In addition, the temperature coefficient of the thermal conductivity of semiclathrate hydrate show a weak negative, and the thermal conductivity is more sensitive to the molar mass of a guest molecule.

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