NMR studies of nanoconfined materials

• Main Authors: Min KaiLee, 李民楷
• Other Authors: Cheng Tien
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/52519423564850842817

博士 === 國立成功大學 === 物理學系碩博士班 === 98 === In this thesis, we report the influence of physical property of metals and ferroelectrics under nanoconfinement. For confined liquid metals, we observed the reduction of Knight shift, melting and freezing phase transition, and atomic mobility comparing to bulk liquid metals. In addition, the slowdown of atomic mobility manifest as acceleration of nuclear spin relaxation for confined liquid gallium and indium caused by enhancement of quadrupole interaction. For confined ferroelectrics, our NMR studies show that there are complex structures in confined materials which correspond to different nuclear relaxation rates. The ferroelectric phase transition become broader and is shifted to lower temperature for the bulk-like component with slower relaxation rate. The faster component in confined sodium nitrite show its behavior corresponding to some sort of melted or premelted state in accordance of our calculation of atomic mobility.