| 초록 |
Alcohols as thermodynamic hydrate inhibitors were frequently used in hydrate fileds, but some alcohol molecules were known to be hydrate formers with help gas. In this study, neutron powder diffraction studies for the crystal structure of the binary (alcohol + methane) hydrates at various temperatures were performed. Temperature-dependent structural behaviors and the inclusion of guest molecules in hydrate cages were also analyzed to check the possible host – guest interaction by Rietveld refinement of the neutron powder diffraction analysis. Present findings showed that thermal factors of host water and guest methane continuously increase as the temperature increases. However, thermal factors of alcohol molecule were abnormally high compared to those of methane in the small cages of sII hydrate. This may be attributed to the off-center behaviors of alcohol molecules in the large cages of sII hydrate. Therefore, it may imply the possible hydrogen bonding interaction between host and guest molecules in the large cages of sII hydrate. The results of this study can be useful for a better understanding of the nature of guest-host interactions occurring in alcohol hydrates. |
