Microscopic Studies on Water and Nuclides inside High-Temperature and -Pressure Bentonite Clay using NMR

我们开发了一种配备高压池的核磁共振系统，用于测量限制在硅珠和膨润土等纳米多孔材料中的水的性质。测定了承压水分子的核磁共振弛豫时间和扩散系数。从这些结果中，我们发现承压水的分子运动受到了抑制，并且它们的运动强烈地依赖于压力。此外，还构建了一种新型的核磁共振探针，可以检测承压水对离子的影响。

We developed a NMR system equipped with a high-pressure cell for measuring water properties confined in nanoporous materials such as silica beads and bentonite clays. The NMR relaxation times and diffusion coefficients of the confined water molecules were examined. From these results, we found that the molecular motions of the confined water were inhibited compared with bulk water, and that their motions depended strongly on the pressures. Moreover, a novel NMR probe, which can examine the effects on ions for the confined water, was constructed.