P-2-4 テラヘルツ波技術を用いたガスハイドレート相変化の観察

抄録

We observed phase change of ice and methane hydrate under the freezing point using terahertz time domain spectroscopy. It has been observed that ice sublimes at temperatures above 240 K even below freezing point. On the other hand, methane hydrate also shown to decrease in sample volume at temperatures between 240 K and 273 K. It might be due to the sublimation of the ice formed by the phase change from methane hydrate. However, as this temperature range matches the temperature range of the self-preservation that occurs in methane hydrate, it is possible to see related the preservation. In any case, it has been shown that the volume change of ice and methane hydrate can be observed contactlessly by using terahertz time domain spectroscopy.