| 학회 |
한국화학공학회 |
| 학술대회 |
2012년 가을 (10/24 ~ 10/26, 부산 BEXCO) |
| 권호 |
18권 2호, p.2132 |
| 발표분야 |
열역학 |
| 제목 |
Structural Transition from Semi- to True Clathrate Hydrates Induced by Adding a Help Gas |
| 초록 |
Diethylamine and n-propylamine known as semi-clathrate hydrate formers are found to show structural transition when inducing a help gas, CH4. The diethylamine∙8.67H2O semi-clathrate hydrates (orthorhombic Pbcn) were changed to sH type (hexagonal P6/mmm) true clathrate hydrates, while the n-propylamine∙6.5H2O semi-clathrate hydrates (monoclinic P21/n) turned to sII clathrate hydrates (cubic Fd3m). Different shape of large voids in the semi-clathrate hydrates changed to typical shape of sH or sII large voids, and pentagonal dodecahedra were formed so as to capture CH4 molecules. Transition pattern and molecular behaviour from semi-clathrate hydrate to true clathrate hydrates were analyzed by means of microscopic methods. In addition to microscopic analysis for transformed hydrate samples, three-phase (L-H-V) equilibrium conditions were also measured in order to identify thermodynamic effect of the guest species. The abnormal phase transition is exteded to a variety of alkylamine semi-clathrate hydrates, enabling the discovery of more precise physicochemical backgrounds in research field related water and ice materials. |
| 저자 |
박성민1, 신웅철1, 이종원2, 서용원3, 이 흔1
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| 소속 |
1KAIST, 2공주대, 3UNIST |
| 키워드 |
Clathrate hydrate |
| E-Mail |
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| 원문파일 |
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