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The structural impact of water sorption on device-quality melanin thin films

Andrew J. Clulow, A. Bernardus Mostert, Margarita Sheliakina, Andrew Nelson, Norman Booth, Paul L. Burn, Ian R. Gentle, Paul Meredith Orcid Logo, Bernard Mostert Orcid Logo

Soft Matter, Volume: 13, Issue: 21, Pages: 3954 - 3965

Swansea University Authors: Paul Meredith Orcid Logo, Bernard Mostert Orcid Logo

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DOI (Published version): 10.1039/c6sm02420c

Abstract

The melanins are a class of pigmentary bio-macromolecules ubiquitous in the biosphere. They possess an intriguing set of physico-chemical properties and have in particular been shown to exhibit hybrid protonic-electronic electrical conductivity, a feature derived from a process termed chemical self-...

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Published in: Soft Matter
ISSN: 1744-683X 1744-6848
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa33930
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first_indexed 2017-05-24T20:00:07Z
last_indexed 2020-06-22T18:45:21Z
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spelling 2020-06-22T16:37:19.3831444 v2 33930 2017-05-24 The structural impact of water sorption on device-quality melanin thin films 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false a353503c976a7338c7708a32e82f451f 0000-0002-9590-2124 Bernard Mostert Bernard Mostert true false 2017-05-24 SPH The melanins are a class of pigmentary bio-macromolecules ubiquitous in the biosphere. They possess an intriguing set of physico-chemical properties and have in particular been shown to exhibit hybrid protonic-electronic electrical conductivity, a feature derived from a process termed chemical self-doping driven by the sorption of water. Although the mechanism underlying the electrical conduction has been established, how the sorbed water interacts with the melanin structure at the physical level has not. Herein we use neutron reflectometry to study changes in the structure of synthetic melanin thin films as a function of H2O and D2O vapour pressure. Water is found to be taken up evenly throughout the films, and by employing the contrast effect, the existence of labile protons through reversible deuterium exchange is demonstrated. Finally, we determine a sorption isotherm to enable quantification of the melanin-water interactions. Journal Article Soft Matter 13 21 3954 3965 1744-683X 1744-6848 15 5 2017 2017-05-15 10.1039/c6sm02420c COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2020-06-22T16:37:19.3831444 2017-05-24T15:15:54.4195213 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Andrew J. Clulow 1 A. Bernardus Mostert 2 Margarita Sheliakina 3 Andrew Nelson 4 Norman Booth 5 Paul L. Burn 6 Ian R. Gentle 7 Paul Meredith 0000-0002-9049-7414 8 Bernard Mostert 0000-0002-9590-2124 9 0033930-14052018145503.pdf 33930.pdf 2018-05-14T14:55:03.0170000 Output 1559175 application/pdf Accepted Manuscript true 2018-05-15T00:00:00.0000000 true eng
title The structural impact of water sorption on device-quality melanin thin films
spellingShingle The structural impact of water sorption on device-quality melanin thin films
Paul Meredith
Bernard Mostert
title_short The structural impact of water sorption on device-quality melanin thin films
title_full The structural impact of water sorption on device-quality melanin thin films
title_fullStr The structural impact of water sorption on device-quality melanin thin films
title_full_unstemmed The structural impact of water sorption on device-quality melanin thin films
title_sort The structural impact of water sorption on device-quality melanin thin films
author_id_str_mv 31e8fe57fa180d418afd48c3af280c2e
a353503c976a7338c7708a32e82f451f
author_id_fullname_str_mv 31e8fe57fa180d418afd48c3af280c2e_***_Paul Meredith
a353503c976a7338c7708a32e82f451f_***_Bernard Mostert
author Paul Meredith
Bernard Mostert
author2 Andrew J. Clulow
A. Bernardus Mostert
Margarita Sheliakina
Andrew Nelson
Norman Booth
Paul L. Burn
Ian R. Gentle
Paul Meredith
Bernard Mostert
format Journal article
container_title Soft Matter
container_volume 13
container_issue 21
container_start_page 3954
publishDate 2017
institution Swansea University
issn 1744-683X
1744-6848
doi_str_mv 10.1039/c6sm02420c
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description The melanins are a class of pigmentary bio-macromolecules ubiquitous in the biosphere. They possess an intriguing set of physico-chemical properties and have in particular been shown to exhibit hybrid protonic-electronic electrical conductivity, a feature derived from a process termed chemical self-doping driven by the sorption of water. Although the mechanism underlying the electrical conduction has been established, how the sorbed water interacts with the melanin structure at the physical level has not. Herein we use neutron reflectometry to study changes in the structure of synthetic melanin thin films as a function of H2O and D2O vapour pressure. Water is found to be taken up evenly throughout the films, and by employing the contrast effect, the existence of labile protons through reversible deuterium exchange is demonstrated. Finally, we determine a sorption isotherm to enable quantification of the melanin-water interactions.
published_date 2017-05-15T03:42:04Z
_version_ 1763751939163553792
score 10.999161

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