| 초록 |
We represent the NMR study of H2 migration in the binary (H2+CH4) and (H2+Xe) structure-I (sI) clathrate hydrates. The synthesis of pure sII hydrogen clathrate hydrate requires the extremely high pressure condition, but with the aid of help gases that promote the lattice formation the binary H2 sI clathrate hydrate can be readly made. The H2 molecules captured into sI small cage (sI-S) at lower temperature migrate to sI large cage (sI-L) through shared pentagonal face of 51262 cage. The hexagonal faces of 51262 cage provide the windows essential for creating continuous diffusion paths for H2 molecules. Thus far, although the vacant channels formed by 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. |
