TY - JOUR
T1 - Dynamics of Nafion membrane swelling in H2O/D2O mixtures as studied using FTIR technique
AU - Bunkin, Nikolai F.
AU - Kozlov, Valeriy A.
AU - Shkirin, Alexey V.
AU - Ninham, Barry W.
AU - Balashov, Anatoliy A.
AU - Gudkov, Sergey V.
N1 - Publisher Copyright:
© 2018 Author(s).
PY - 2018/3/28
Y1 - 2018/3/28
N2 - Experiments with Fourier transform spectrometry of Nafion, a water-swollen polymeric membrane, are described. The transmittance spectra of liquid samples and Nafion, soaked in these samples, were studied, depending on the deuterium content in water in the spectral range 1.8-2.15 μm. The experiments were carried out using two protocols: in the first protocol we studied the dynamics of Nafion swelling in H2O + D2O mixtures for the deuterium concentrations 3 < C < 104 ppm, and in the second protocol we studied the dynamics of swelling in pure heavy water (C = 106 ppm). For liquid mixtures in the concentration range 3 < C < 104 ppm, the transmittance spectra are the same, but for Nafion soaked in these fluids, the corresponding spectra are different. It is shown that, in the range of deuterium contents C = 90-500 ppm, the behavior of transmittance of the polymer membrane is non-monotonic. In experiments using the second protocol, the dynamics of diffusion replacement of residual water, which is always present in the bulk of the polymer membrane inside closed cavities (i.e., without access to atmospheric air), were studied. The experimentally estimated diffusion coefficient for this process is ≈6·10-11 cm2/s.
AB - Experiments with Fourier transform spectrometry of Nafion, a water-swollen polymeric membrane, are described. The transmittance spectra of liquid samples and Nafion, soaked in these samples, were studied, depending on the deuterium content in water in the spectral range 1.8-2.15 μm. The experiments were carried out using two protocols: in the first protocol we studied the dynamics of Nafion swelling in H2O + D2O mixtures for the deuterium concentrations 3 < C < 104 ppm, and in the second protocol we studied the dynamics of swelling in pure heavy water (C = 106 ppm). For liquid mixtures in the concentration range 3 < C < 104 ppm, the transmittance spectra are the same, but for Nafion soaked in these fluids, the corresponding spectra are different. It is shown that, in the range of deuterium contents C = 90-500 ppm, the behavior of transmittance of the polymer membrane is non-monotonic. In experiments using the second protocol, the dynamics of diffusion replacement of residual water, which is always present in the bulk of the polymer membrane inside closed cavities (i.e., without access to atmospheric air), were studied. The experimentally estimated diffusion coefficient for this process is ≈6·10-11 cm2/s.
UR - http://www.scopus.com/inward/record.url?scp=85044251343&partnerID=8YFLogxK
U2 - 10.1063/1.5022264
DO - 10.1063/1.5022264
M3 - Article
SN - 0021-9606
VL - 148
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 12
M1 - 124901
ER -