불화 암모늄이 포함된 크러스레이트 하이드레이트의 열팽창 거동 연구
Thermal Expansion Behavior of Clathrate Hydrates with Ammonium Fluoride
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초록
이 연구에서는 불화 암모늄(NH4F)이 포함된 크러스레이트 하이드레이트의 열팽창 거동에 관한 연구를 수행하였다. 불화 암모늄과 물로 구성된 구조 안에 포집된 객체 분자는 프로필렌 옥사이드(Propylene oxide), 2-메틸-2-프로펜-1-올(2-Methyl-2-propen-1-ol), 메탄올(Methanol)로, X선 회절분석을 통해 얻은 하이드레이트의 패턴 분석을 통하여 입방정계 Fd3m 하이드레이트의 형성을 확인하였다. 불화 암모늄이 포함된 하이드레이트 구조는 기존의 순수물로 구성된 하이드레이트의 격자상수에 비하여 더 작은 값을 가지는 것으로 나타났다. 객체 분자의 크기, 형태의 영향으로 2-메틸-2-프로펜-1-올과 메탄올이 포집된 하이드레이트의 격자상수는 프로필렌 옥사이드와 메탄올이 포집된 하이드레이트의 값보다 큰 것으로 확인되었으며, 열팽창률 또한 큰 것으로 확인되었다.
Abstract
Herein, the thermal expansion behavior of clathrate hydrates with ammonium fluoride (NH4F) was investigated. Water and NH4F comprise a ‘host’ hydrate structure, where ‘guest’ molecules, including propylene oxide, 2-methyl-2-propen-1-ol, and methanol, are captured in hydrate cages. The X-ray diffraction patterns of the hydrate samples were examined, confirming the formation of a cubic Fd3m hydrate. Notably, methanol can be captured in the hydrate cages with NH4F. The lattice parameters of the clathrate hydrates with NH4F were found to be smaller than those of the clathrate hydrates with pure water. In addition, the lattice parameters of clathrate hydrates encapsulating 2-methyl-2-propen-1-ol and methanol were larger than those with propylene oxide and methane due to the effects of molecular size and shape. Finally, the effects of molecular size and shape on the thermal expansivity of clathrate hydrates with NH4F were confirmed.
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