Dynamic Structure of Nanospace as Studied by Xenon-129 NMR porosimetry

点击翻译按钮获取中文摘要

In this research, dynamic character of nano-space formed by microemulsion, metallic complex and organic zeolite was investigated by Xenon-129 nuclear magnetic resonance (NMR) spectroscopy, in order to discover and clarification of their novel physicochemical properties.At first, we conducted ^<13>C and ^<129>Xe NMR measurements on typical inorganic zeolites to examine guest-guest and/or guest-host interactions as well as the local structure of adsorbates on the adsorption process.Next, we developed this methodology into metal-organic framework [M_2(O_2CPh)_4(pyz)]_n=Cu, Rh) together with xenon high-pressure adsorption isotherm measurements. It was found that adsorption of xenon in this specimen takes place by forming dimer structure of xenon.In addition, we also applied ^<129>Xe NMR to microemulsion in ternary system of pentaethyleneglycol monododecylether/heavy water/decane. We found that ^<129>Xe chemical shift in decane showed good correlation with the dynamic mean radius of microemulsion. This aspect strongly suggests that ^<129>Xe chemical shift becomes new measure to determine the microemulsion size.Thus, we have clarified and achieved our original aim in this research project. Furthermore, we found the possibility of the newly development of this methodology such as determination of microemulsion size and probe of intermolecular interaction in the nanospace. Future new development of ^<129>XeNMR porosimetry is expected.