NDLI: Equilibrium and crystallographic measurements of the binary tetrahydrofuran and helium clathrate hydrates

Content Provider	Springer Nature Link
Author	Yeon, Sun Hwa Park, Jeasung Park, Youngjune Choi, Sukjeong Shin, Kyuchul Seol, Jiwoong Cha, Minjun Lee, Huen
Copyright Year	2008
Abstract	Clathrate compounds are crystalline materials formed by a physical interaction between host and relatively light guest molecules. Various types of nano-sized cages surrounded by host frameworks exist in the highly unique crystalline structures and free guest molecules are entrapped in an open host-guest network. Recently, we reported two peculiar phenomena, swapping and tuning, naturally occurring in the hydrate cages. Helium, one of the smallest light guest molecules, must be the challengeable material in the sense of physics and moreover possesses versatile applications in the field of superconductivity technology and thermonuclear industry. In this regard, we attempted for the first time to synthesize helium hydrates at moderate temperature and pressure conditions. According to inclusion phenomena, helium itself normally cannot form clathrate hydrates due to being too small molecularly without the help of hydrate former molecules (sI, sII, and sH formers). In this study, the hydrate equilibria of the binary clathrate hydrate containing tetrahydrofuran, helium, and water were determined at 2, 3, 5.56 THF mol%. Direct volumetric measurements were also carried out to confirm the exact amount of helium captured in the hydrate cages. Finally, the crystalline structure of the formed mixed hydrates was identified by powder X-ray diffraction, resulting in structure II.
Starting Page	154
Ending Page	157
Page Count	4
File Format	PDF
ISSN	02561115
Journal	Korean Journal of Chemical Engineering
Volume Number	25
Issue Number	1
e-ISSN	19757220
Language	English
Publisher	Springer US
Publisher Date	2008-02-27
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Helium Clathrate Hydrate Tetrahydrofuran Phase Equilibria Crystalline Structure Biotechnology Materials Science Catalysis Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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