2H nuclear magnetic resonance study of deuterated water dynamics in perfluorosulfonic acid ionomer Nafion

Jun Hee Han; Kyu Won Lee; Cheol Eui Lee

doi:10.1016/j.jpcs.2016.07.012

²H nuclear magnetic resonance study of deuterated water dynamics in perfluorosulfonic acid ionomer Nafion

Jun Hee Han, Kyu Won Lee, Cheol Eui Lee

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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 T_M=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 T_M in the laboratory-frame NMR spin–lattice relaxation, the rotating-frame spin–lattice relaxation indicated no bulk liquid water state down to 200 K.

Original language	English
Pages (from-to)	280-282
Number of pages	3
Journal	Journal of Physics and Chemistry of Solids
Volume	98
DOIs	https://doi.org/10.1016/j.jpcs.2016.07.012
Publication status	Published - 2016 Nov 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (Project no. 2013057555 , 2016R1D1A1A09917003, and NRF-2010-0027963 ). Measurements at the Korea Basic Science Institute (KBSI) are acknowledged.

Keywords

Lattice dynamics
Nuclear magnetic resonance (NMR)
Polymers

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1016/j.jpcs.2016.07.012

Cite this

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title = "2H nuclear magnetic resonance study of deuterated water dynamics in perfluorosulfonic acid ionomer Nafion",

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.",

keywords = "Lattice dynamics, Nuclear magnetic resonance (NMR), Polymers",

author = "Han, {Jun Hee} and Lee, {Kyu Won} and Lee, {Cheol Eui}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (Project no. 2013057555 , 2016R1D1A1A09917003, and NRF-2010-0027963 ). Measurements at the Korea Basic Science Institute (KBSI) are acknowledged.",

year = "2016",

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doi = "10.1016/j.jpcs.2016.07.012",

language = "English",

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journal = "Journal of Physics and Chemistry of Solids",

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T1 - 2H nuclear magnetic resonance study of deuterated water dynamics in perfluorosulfonic acid ionomer Nafion

AU - Han, Jun Hee

AU - Lee, Kyu Won

AU - Lee, Cheol Eui

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (Project no. 2013057555 , 2016R1D1A1A09917003, and NRF-2010-0027963 ). Measurements at the Korea Basic Science Institute (KBSI) are acknowledged.

PY - 2016/11/1

Y1 - 2016/11/1

N2 - 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.

AB - 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.

KW - Lattice dynamics

KW - Nuclear magnetic resonance (NMR)

KW - Polymers

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