Spectroscopic analysis and structure identification of ion entrapped clathrate hydrate = 이온 하이드레이트의 분광학 및 구조적 해석

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Unlike widely known non-ionic clathrate hydrates stabilized by van der Waals interaction between a host framework and guest molecule, ionic clathrate hydrates are a type of inclusion compound in which an ionic interaction exists between a cation or anion guest and the surrounding host cage. In this study, spectroscopic analysis and structure identification of ionic double hydrate and binary hydrate were investigated using NMR, Raman and X-ray diffraction spectrometer. The research scope of this study can be divided into two major fields. The first one is complex inclusion phenomena occurring in ionic clathrate hydrates, the second one is molecular dynamics of guest molecules with highly flexible lattice. First, extraordinary structural transition in cage-like as well as channel-like host frameworks of the double $(CH_4 + tetramethylammonium hydroxide (Me_4NOH))$ and $(H_2 + Me_4NOH)$ ionic clathrate hydrates and mixed Me4NOH clathrate hydrates are reported. In particular, intracrystalline channel patterns created in complex ionic host-guest networks are considered to play an important role in providing pathways and windows for small guest diffusion and sorption. Although the vacant channels formed by the linkage of specific cages have not received any attention in the inclusion phenomena of clathrate hydrates, it is essential to realize that these channels can play an important role in guest diffusion pathways and occupancy occurring in a complex clathrate hydrate matrix. Second, in other to investigate the molecular dynamics of guest molecules in clathrate hydrate, the binary $(H_2 + CH_4)$ and $(H_2 + Xe)$ structure-I (sI) clathrate hydrates were used. A notable observation appears in the spectra measured at temperatures above 223K, the proton signal implies that the H_2 diffusion is likely to occur in the hydrate phase to the direction of either sI-S to sI-L or sI-L to sI-S. This observation implies that the migration pathway of H_2 molecules is quite t...
Advisors
Lee, Huenresearcher이흔researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2008
Identifier
295356/325007  / 020045274
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2008.2, [ iv, 83 p. ]

Keywords

clathrate hydrate; ion guest; inclusion compound; spectroscopic analysis; host-guest system; 클러스레이트; 이온 객체; 포접 화합물; 분광학적 분석; 주체 객체 시스템; clathrate hydrate; ion guest; inclusion compound; spectroscopic analysis; host-guest system; 클러스레이트; 이온 객체; 포접 화합물; 분광학적 분석; 주체 객체 시스템

URI
http://hdl.handle.net/10203/29029
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=295356&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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