| Summary: | 碩士 === 國立中正大學 === 化學暨生物化學研究所 === 102 === FFC (Fast Field Cycling)NMR relaxometry is a very powerful tool to investigate the molecular dynamic at low frequency (0.01-40MHz) and study the slow molecular motions.Relaxation used in this present study has more advantages over mechanical field cycling.The important applications of FFC NMR includes proteins ,liquids which confined in porous materials ,and polymers. The relaxation rate of bulk and confined sample are different at low frequency region (0.01-40MHz).
In this study ,nuclear magnetic relaxation dispersion (NMRD) is utilized to investigate the H2O molecular dynamic with 5% , 10% and 20% content in H-ZSM-5 at the temperature range of 208K and 298K. We got some molecular dynamic parameters by molecular dynamic fitting. According to NMRD profile , We found that the relaxation rate increases gradually with the decreasing frequencies and then increases with the decreaseing temperature. According to the fitting data ,we can get some message about dynamic and distribution of water which confined in the pore material .In addition , we found that phase transition temperature has something to do with water where in big or small pore.
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