Polarization Processes in Nafion Composite Membranes Doped with Rare-Earth Metals
Dielectric spectroscopy (frequency range f = 10<sup>0</sup>…10<sup>7</sup> Hz and temperatures T = 293…403 K (accuracy 0.5 K), measuring voltage applied to the sample was 1.0 V) was used to study composite materials based on perfluorosulfonic membranes with inclusions of rare...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/18/6172 |
| _version_ | 1797579078667075584 |
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| author | Rene Castro Elena Karulina Nikolay Lapatin |
| author_facet | Rene Castro Elena Karulina Nikolay Lapatin |
| author_sort | Rene Castro |
| collection | DOAJ |
| description | Dielectric spectroscopy (frequency range f = 10<sup>0</sup>…10<sup>7</sup> Hz and temperatures T = 293…403 K (accuracy 0.5 K), measuring voltage applied to the sample was 1.0 V) was used to study composite materials based on perfluorosulfonic membranes with inclusions of rare-earth elements, in particular, europium (III) and terbium (III) chlorides. The dispersion of the permittivity and the presence of maxima, corresponding to losses, were revealed, which indicates that relaxation processes of various natures were present. The membrane layers under investigation are characterized by relaxation parameters that correspond to a symmetrical distribution of relaxers over relaxation times. The spectrum of relaxers changed when terbium and europium metal impurities were introduced into the polymer matrix. The investigation of these polymer systems demonstrated a power-law dependence of the specific conductivity on frequency. A decrease in the exponent with increasing temperature indicates the existence of a traditional hopping mechanism for charge transfer. The observed changes in the dielectric permittivity and specific conductivity are due to a change in the nature of polarization processes because of the strong interaction of metal (terbium and europium) ions with the polymer matrix of Nafion. |
| first_indexed | 2024-03-10T22:30:53Z |
| format | Article |
| id | doaj.art-3e441682a6d642268e1aa0505b8160e2 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T22:30:53Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-3e441682a6d642268e1aa0505b8160e22023-11-19T11:43:53ZengMDPI AGMaterials1996-19442023-09-011618617210.3390/ma16186172Polarization Processes in Nafion Composite Membranes Doped with Rare-Earth MetalsRene Castro0Elena Karulina1Nikolay Lapatin2Institute of Physics, Herzen State Pedagogical University of Russia, 48 Moika Emb., 191186 St. Petersburg, RussiaInstitute of Physics, Herzen State Pedagogical University of Russia, 48 Moika Emb., 191186 St. Petersburg, RussiaInstitute of Physics, Herzen State Pedagogical University of Russia, 48 Moika Emb., 191186 St. Petersburg, RussiaDielectric spectroscopy (frequency range f = 10<sup>0</sup>…10<sup>7</sup> Hz and temperatures T = 293…403 K (accuracy 0.5 K), measuring voltage applied to the sample was 1.0 V) was used to study composite materials based on perfluorosulfonic membranes with inclusions of rare-earth elements, in particular, europium (III) and terbium (III) chlorides. The dispersion of the permittivity and the presence of maxima, corresponding to losses, were revealed, which indicates that relaxation processes of various natures were present. The membrane layers under investigation are characterized by relaxation parameters that correspond to a symmetrical distribution of relaxers over relaxation times. The spectrum of relaxers changed when terbium and europium metal impurities were introduced into the polymer matrix. The investigation of these polymer systems demonstrated a power-law dependence of the specific conductivity on frequency. A decrease in the exponent with increasing temperature indicates the existence of a traditional hopping mechanism for charge transfer. The observed changes in the dielectric permittivity and specific conductivity are due to a change in the nature of polarization processes because of the strong interaction of metal (terbium and europium) ions with the polymer matrix of Nafion.https://www.mdpi.com/1996-1944/16/18/6172perfluorosulfonic membranemodificationsorptionrare-earth elements (Eu<sup>3+</sup>, Tb<sup>3+</sup>)electrophysical propertiespolarization processes |
| spellingShingle | Rene Castro Elena Karulina Nikolay Lapatin Polarization Processes in Nafion Composite Membranes Doped with Rare-Earth Metals Materials perfluorosulfonic membrane modification sorption rare-earth elements (Eu<sup>3+</sup>, Tb<sup>3+</sup>) electrophysical properties polarization processes |
| title | Polarization Processes in Nafion Composite Membranes Doped with Rare-Earth Metals |
| title_full | Polarization Processes in Nafion Composite Membranes Doped with Rare-Earth Metals |
| title_fullStr | Polarization Processes in Nafion Composite Membranes Doped with Rare-Earth Metals |
| title_full_unstemmed | Polarization Processes in Nafion Composite Membranes Doped with Rare-Earth Metals |
| title_short | Polarization Processes in Nafion Composite Membranes Doped with Rare-Earth Metals |
| title_sort | polarization processes in nafion composite membranes doped with rare earth metals |
| topic | perfluorosulfonic membrane modification sorption rare-earth elements (Eu<sup>3+</sup>, Tb<sup>3+</sup>) electrophysical properties polarization processes |
| url | https://www.mdpi.com/1996-1944/16/18/6172 |
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