DOSY NMR STUDY OF WATER DIFFUSION IN NAFION/SnO2 COMPOSITE MEMBRANE
The behavior of water in Nafion membrane is very important and 1H NMR is the very powerful technique to investigate the chemical structure and proton dynamics. The NMR spectra and diffusion coefficient of proton in Nafion/SnO2 membrane are discussed in detail. Diffusion coefficients of proton in Nafion/SnO2 were carried by using Diffusion Order Spectroscopy (DOSY) NMR. DOSY NMR spectra are usually obtained from the analysis of the signal amplitudes of the pulse field gradient spin echo (PFG-SE) which gives 2D spectra with chemical shift on one axis and the diffusion coefficient on the other. The diffusion coefficient of proton was found to be higher in 11wt% of SnO2 and the value is 1.17x10-9 m2s-1 at room temperature (R.T) with 100% relative humidity (R.H). Three types of protons were observed in DOSY NMR via tightly bound water (non-freezable water), physisorbed water (freezable water) and free water at higher concentration of SnO2 while DOSY spectrum of pure Nafion shows one proton corresponds to the free water which behave like bulk water.
Jeyapandian Malathi Yoshiki Iwai Kazunori Horiuchi Junichi Kawamura Junichiro Mizusaki Subramanian Selvasekarapandian
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University,Katahira 2-1-1, Ao Institute of Multidisciplinary Research for Advanced Materials, Tohoku University,Katahira 2-1-1, Ao Department of Physics, Kalasalingam University, Krishnankoil, Tamilnadu, 626 190, India
国际会议
The 12th Asian Conference on Solid State Ionics(第十二届亚洲固态离子学会议暨第十五届中国固态离子学会议)
武汉
英文
134-140
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）