2005 Fiscal Year Final Research Report Summary
Studies on single crystal growth of methane-ethane hydrate and its elastic properties
| Project/Area Number |
16540284
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Gifu University |
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Principal Investigator |
SASAKI Shigeo Gifu Univ., Fac.of Engineering, Associate Professor, 工学部, 助教授 (30196159)
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| Co-Investigator(Kenkyū-buntansha) |
KUME Tetsuji Gifu Univ., Fac.of Engineering, Research Associate, 工学部, 助手 (30293541)
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| Project Period (FY) |
2004 – 2005
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| Keywords | methane hydrate / methane-ethane hydrate / ethylene hydrate / methane-ethylene hydrate / diamond anvil cell / Raman scattering / Brillouin scattering / elastic properties |
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| Research Abstract |
The purposes of this research are to make single crystals of methane-ethane and methane-ethylene hydrates, and to determine the elastic properties and structural stabilities of these synthesized hydrates.
We succeeded in growing single crystals of ethylene and methane-ethylene hydrates using a high-pressure diamond anvil cell. By applying the high-pressure Raman spectroscopy to the above single crystals, we have found that the structure I of ethylene and methane-ethylene hydrates exist up to 1.6 GPa and 1.7 GPa, respectively, which are higher than methane hydrate. Furthermore, the high-pressure Brillouin experiments for the single crystalline ethylene and methane-ethylene hydrates and their computational analysis yielded the elastic properties of the structure I of ethylene and methane-ethylene hydrates which are stiffer than those of methane hydrate. These results suggest that the occupation of host water cages by larger ethylene molecule increases the structural stability of methane-ethylene hydrates. The results of this research are also contributed to the estimation of elastic properties of various gas hydrates such as natural methane hydrate in the deep sea deposit.
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