The study of structural stability of gas hydrates by using light scattering and NMR spectroscopies

为了将大量存在于海底的甲烷水合物作为一种备受关注的替代能源加以利用，对其弹性性质和结构稳定性进行研究具有重要意义。本文利用高压拉曼光谱和布里渊散射光谱研究了甲烷-丙烷混合气体水合物(MPH)和全氢甲烷水合物(FDMH)的储气量、压力诱导相变和弹性性质，发现FDMH的甲烷与水分子之间的相互作用可能不同于甲烷水合物，天然气水合物的弹性性质取决于其结构和被包裹的气体分子。

In order to utilize a large amount of methane hydrate which exists under the deep sea floor and attracts much attention as an alternative energy resource, it is very important to investigate its elastic properties and structural stability. The purpose of the present study is to estimate the gas storage capacities, the pressure-induced phase transformations, and the elastic properties of methane-propane mixed gas hydrate (MPH) and fully deuterated methane hydrate (FDMH) by using high-pressure Raman and Brillouin scattering spectroscopies.As a result, it is found out that the interaction between methane and water molecules of FDMH is possibly different from that of methane hydrate and the elastic properties of gas hydrates depend on their structures and the encaged gas molecules.