Proton Conduction via Water Bridges Hydrated in the Collagen Film
Collagen films with proton conduction are a candidate of next generation of fuel-cell electrolyte. To clarify a relation between proton conductivity and formation of water networks in the collagen film originating from a tilapia’s scale, we systematically measured the ac conductivity, infrared absor...
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| Format: | Article |
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MDPI AG
2020-09-01
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| Series: | Journal of Functional Biomaterials |
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| Online Access: | https://www.mdpi.com/2079-4983/11/3/61 |
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| author | Hiroshi Matsui Yasumitsu Matsuo |
| author_facet | Hiroshi Matsui Yasumitsu Matsuo |
| author_sort | Hiroshi Matsui |
| collection | DOAJ |
| description | Collagen films with proton conduction are a candidate of next generation of fuel-cell electrolyte. To clarify a relation between proton conductivity and formation of water networks in the collagen film originating from a tilapia’s scale, we systematically measured the ac conductivity, infrared absorption spectrum, and weight change as a function of relative humidity (RH) at room temperature. The integrated absorbance concerning an O–H stretching mode of water molecules increases above 60% RH in accordance with the weight change. The dc conductivity varies in the vicinity of 60 and 83% RH. From those results, we have determined the dc conductivity vs. hydration number (<i>N</i>) per unit (Gly-X-Y). The proton conduction is negligible in the collagen molecule itself, but dominated by the hydration shell, the development of which is characterized with three regions. For 0 < <i>N</i> < 2, the conductivity is extremely small, because the water molecule in the primary hydration shell has a little hydrogen bonded with each other. For 2 < <i>N</i> < 4, a quasi-one-dimensional proton conduction occurs through intra-water bridges in the helix. For 4 < <i>N</i>, the water molecule fills the helix, and inter-water bridges are formed in between the adjacent helices, so that a proton-conducting network is extended three dimensional. |
| first_indexed | 2024-03-10T16:37:41Z |
| format | Article |
| id | doaj.art-471365fac8174201b70b345b4dde158d |
| institution | Directory Open Access Journal |
| issn | 2079-4983 |
| language | English |
| last_indexed | 2024-03-10T16:37:41Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Functional Biomaterials |
| spelling | doaj.art-471365fac8174201b70b345b4dde158d2023-11-20T12:18:54ZengMDPI AGJournal of Functional Biomaterials2079-49832020-09-011136110.3390/jfb11030061Proton Conduction via Water Bridges Hydrated in the Collagen FilmHiroshi Matsui0Yasumitsu Matsuo1Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, JapanDepartment of Life Science, Faculty of Science & Engineering, Setsunan University, Neyagawa 572-8508, JapanCollagen films with proton conduction are a candidate of next generation of fuel-cell electrolyte. To clarify a relation between proton conductivity and formation of water networks in the collagen film originating from a tilapia’s scale, we systematically measured the ac conductivity, infrared absorption spectrum, and weight change as a function of relative humidity (RH) at room temperature. The integrated absorbance concerning an O–H stretching mode of water molecules increases above 60% RH in accordance with the weight change. The dc conductivity varies in the vicinity of 60 and 83% RH. From those results, we have determined the dc conductivity vs. hydration number (<i>N</i>) per unit (Gly-X-Y). The proton conduction is negligible in the collagen molecule itself, but dominated by the hydration shell, the development of which is characterized with three regions. For 0 < <i>N</i> < 2, the conductivity is extremely small, because the water molecule in the primary hydration shell has a little hydrogen bonded with each other. For 2 < <i>N</i> < 4, a quasi-one-dimensional proton conduction occurs through intra-water bridges in the helix. For 4 < <i>N</i>, the water molecule fills the helix, and inter-water bridges are formed in between the adjacent helices, so that a proton-conducting network is extended three dimensional.https://www.mdpi.com/2079-4983/11/3/61proton conductionionic conductionfuel-cell electrolytecollagenhydrationwater bridge |
| spellingShingle | Hiroshi Matsui Yasumitsu Matsuo Proton Conduction via Water Bridges Hydrated in the Collagen Film Journal of Functional Biomaterials proton conduction ionic conduction fuel-cell electrolyte collagen hydration water bridge |
| title | Proton Conduction via Water Bridges Hydrated in the Collagen Film |
| title_full | Proton Conduction via Water Bridges Hydrated in the Collagen Film |
| title_fullStr | Proton Conduction via Water Bridges Hydrated in the Collagen Film |
| title_full_unstemmed | Proton Conduction via Water Bridges Hydrated in the Collagen Film |
| title_short | Proton Conduction via Water Bridges Hydrated in the Collagen Film |
| title_sort | proton conduction via water bridges hydrated in the collagen film |
| topic | proton conduction ionic conduction fuel-cell electrolyte collagen hydration water bridge |
| url | https://www.mdpi.com/2079-4983/11/3/61 |
| work_keys_str_mv | AT hiroshimatsui protonconductionviawaterbridgeshydratedinthecollagenfilm AT yasumitsumatsuo protonconductionviawaterbridgeshydratedinthecollagenfilm |