2H nuclear magnetic resonance study of deuterated water dynamics in perfluorosulfonic acid ionomer Nafion |
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| Institution: | 1. Spin Engineering Physics Team, Korea Basic Science Institute (KBSI), Daejeon 305-806, Republic of Korea;2. Department of Physics, Korea University, Seoul 02841, Republic of Korea;1. School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;2. Center of Excellent on Advanced Functional Materials (CoE-AFM), Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;1. Department of Chemical Engineering, National Institute of Technology Durgapur, West Bengal 713209, India;2. Department of Chemistry, National Institute of Technology Durgapur, West Bengal 713209, India;1. College of Chemical Engineering, Zhejiang University of Technology, No. 18, Chaowang Road, Hangzhou 310014, People''s Republic of China;2. School of Electronic Engineering, Dongguan University of Technology, Guangdong 523808, People''s Republic of China;3. College of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang 312000, People''s Republic of China;4. Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, People''s Republic of China;5. NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;1. Department of Chemistry, Physical Chemistry Section, Visva Bharati University, Santiniketan, Birbhum 731235, West Bengal, India;2. Department of Chemistry, Bishnupur Ramananda College, Bishnupur, Bankura 722122, West Bengal, India;3. Department of Chemistry, Brahmankhanda Basapara High School, Basapara, Birbhum 731215, West Bengal, India;1. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;2. Department of Mechanical and Materials Engineeering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;3. Department of Physics, University of Pune, Pune 411007, Maharashtra, India |
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| Abstract: | We have employed deuteron nuclear magnetic resonance (NMR) spectroscopy in order to study the dynamics of the deuterated water (D2O) molecules introduced into a perfluorosulfonic acid ionomer Nafion (NR-211) film. According to the 2H NMR spectral analysis, the deuterated water molecules at low temperatures occupied either relatively rigid or mobile sites up to the temperature TM=240 K where all the deuterated water molecules became mobile. The temperature-dependent NMR linewidths sensitively reflected the motional narrowing of the rigid and mobile sites, and the NMR chemical shift reflected significant changes in the hydrogen bonds of the deuterated water. While a slow- to fast-limit motional transition was manifested at TM in the laboratory-frame NMR spin–lattice relaxation, the rotating-frame spin–lattice relaxation indicated no bulk liquid water state down to 200 K. |
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| Keywords: | Polymers Nuclear magnetic resonance (NMR) Lattice dynamics |
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