| Item type |
文献 / Documents(1) |
| 公開日 |
2023-10-11 |
| アクセス権 |
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|
アクセス権 |
open access |
| 資源タイプ |
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|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版社版DOI |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.1039/D3CP03096B |
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|
言語 |
ja |
|
|
関連名称 |
10.1039/D3CP03096B |
| 出版タイプ |
|
|
出版タイプ |
AM |
|
出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| タイトル |
|
|
タイトル |
Direct observation of pressure-induced amorphization of methane/ethane hydrates using Raman and infrared spectroscopy |
|
言語 |
en |
| 著者 |
野口, 直樹
シライシ, ユイ
カゲヤマ, マホ
ヨコイ, ユウ
クロハマ, サキ
オカダ, ナツキ
岡村, 英一
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| 抄録 |
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|
内容記述タイプ |
Abstract |
|
内容記述 |
The pressure-induced amorphization (PIA) of ice and clathrate hydrates occurs at temperatures significantly below their melting and decomposition points. The PIA of type I clathrate hydrates containing methane and ethane as guest molecules was investigated using Raman and infrared (IR) spectroscopy. With isothermal compression at 100 K, methane hydrate (MH) underwent PIA at 2–3.5 GPa, whereas ethane hydrate (EH) underwent PIA at 4.0–5.5 GPa. The type I clathrate structure consists of small (512) and large (51262) cages. The Raman results revealed that the collapsed small and large cages in the amorphous forms of MH and EH were not distinguishable. The collapsed cages, including the methane and ethane molecules, were similar to the small and large cages, respectively. Their water networks were folded or expanded during the PIA process so that the cavity sizes of the collapsed cages were compatible with those of the guest molecules. Peaks in the IR spectra of crystalline MH assignable to the ro-vibrational transition of methane in large cages were observed in the C–H stretching wavenumber region below 40 K. The ro-vibrational IR band disappeared after amorphization, suggesting that the rotational motion of the methane molecule in the large cage was frozen by the collapse, as reported in previous dielectric spectroscopic and simulation studies. This study contributes to a better understanding of the changes in the local structure around guest molecules during PIA and the dynamics of the guest molecules. |
|
言語 |
en |
| 書誌情報 |
en : Physical Chemistry Chemical Physics
巻 25,
号 33,
p. 22161-22170,
発行日 2023-08-07
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| 収録物ID |
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収録物識別子タイプ |
ISSN |
|
収録物識別子 |
14639076 |
| 収録物ID |
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|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
14639084 |
| 収録物ID |
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|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11301773 |
| 収録物ID |
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収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11723355 |
| 出版者 |
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|
出版者 |
The Royal Society of Chemistry |
|
言語 |
en |
| EID |
|
|
識別子 |
400204 |
|
識別子タイプ |
URI |
| 言語 |
|
|
言語 |
eng |
pccp_25_33_22161.pdf (2.17 MB)
