Nondestructive Imaging of Anomalously Preserved Methane Clathrate Hydrate by Phase Contrast X-ray Imaging

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• 作者：Satoshi Takeya ; Akio Yoneyama ; Kazuhiro Ueda ; Kazuyuki Hyodo ; Tohoru Takeda ; Hiroko Mimachi ; Masahiro Takahashi ; Toru Iwasaki ; Kenichi Sano ; Hiroshi Yamawaki ; Yoshito Gotoh
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：August 18, 2011
• 年：2011
• 卷：115
• 期：32
• 页码：16193-16199
• 全文大小：950K
• 年卷期：v.115,no.32(August 18, 2011)
• ISSN：1932-7455

文摘

Nondestructive observation of anomalously preserved methane (CH₄) hydrate stored outside its thermodynamically stable zone below the melting point of ice was performed at 193 K. By use of two different types of phase contrast X-ray imaging techniques, X-ray interferometric imaging and diffraction enhanced imaging, it was shown that CH₄ hydrate stored under anomalous preservation conditions was completely enveloped and stabilized by a thin layer of ice. The thickness of the ice layer was inhomogeneous, with an average thickness of about 100 渭m after storage for 24 h at 253 K. These results obtained were consistent with quantitative analysis by means of powder X-ray diffraction and Raman spectroscopy. It was revealed that the interior of CH₄ hydrate retained a high CH₄ gas storage capacity even after one month under thermodynamically unstable conditions.