Elasticity and Stability of Clathrate Hydrate: Role of Guest Molecule Motions

Jihui Jia, Yunfeng Liang, Takeshi Tsuji, Sumihiko Murata, Toshifumi Matsuoka

研究成果: ジャーナルへの寄稿記事

12 引用 (Scopus)

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Molecular dynamic simulations were performed to determine the elastic constants of carbon dioxide (CO2) and methane (CH4) hydrates at one hundred pressure-temperature data points, respectively. The conditions represent marine sediments and permafrost zones where gas hydrates occur. The shear modulus and Young's modulus of the CO2 hydrate increase anomalously with increasing temperature, whereas those of the CH4 hydrate decrease regularly with increase in temperature. We ascribe this anomaly to the kinetic behavior of the linear CO2 molecule, especially those in the small cages. The cavity space of the cage limits free rotational motion of the CO2 molecule at low temperature. With increase in temperature, the CO2 molecule can rotate easily, and enhance the stability and rigidity of the CO2 hydrate. Our work provides a key database for the elastic properties of gas hydrates, and molecular insights into stability changes of CO2 hydrate from high temperature of ~5 °C to low decomposition temperature of ~-150 °C.

元の言語英語
記事番号1290
ジャーナルScientific reports
7
発行部数1
DOI
出版物ステータス出版済み - 12 1 2017

All Science Journal Classification (ASJC) codes

  • General

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