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The influence of copper ions on the transport and relaxation properties of hydrated eumelanin

Pavel A. Abramov Orcid Logo, Sergey S. Zhukov Orcid Logo, Maxim Savinov Orcid Logo, Bernard Mostert Orcid Logo, Konstantin A. Motovilov Orcid Logo

Physical Chemistry Chemical Physics, Volume: 25, Issue: 16, Pages: 11601 - 11612

Swansea University Author: Bernard Mostert Orcid Logo

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DOI (Published version): 10.1039/d3cp00975k

Abstract

Eumelanin, the human skin pigment, is a poly-indolequinone material possessing a unique combination of physical and chemical properties. For numerous applications, the conductivity of eumelanin is of paramount importance. However, its hydration dependent conductivity is not well studied using transp...

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Published in: Physical Chemistry Chemical Physics
ISSN: 1463-9076 1463-9084
Published: Royal Society of Chemistry (RSC)
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URI: https://cronfa.swan.ac.uk/Record/cronfa64652
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spelling v2 64652 2023-10-03 The influence of copper ions on the transport and relaxation properties of hydrated eumelanin a353503c976a7338c7708a32e82f451f 0000-0002-9590-2124 Bernard Mostert Bernard Mostert true false 2023-10-03 SPH Eumelanin, the human skin pigment, is a poly-indolequinone material possessing a unique combination of physical and chemical properties. For numerous applications, the conductivity of eumelanin is of paramount importance. However, its hydration dependent conductivity is not well studied using transport-relaxation methods. Furthermore, there is no such work taking into account the simultaneous control of humidity as well as metal ion concentration. Here we present the first such study of the transport and relaxation characteristics of synthetic eumelanin doped with various Cu ion concentrations while controlling the humidity with a frequency range of 10−3 Hz–1 MHz. We found that Cu ions do not cause the appearance of additional relaxation processes, but partially slow down those present in neat eumelanin. In addition, considering previously published work, the key relaxation process observed in doped and undoped materials is associated with the moisture-induced synthesis of uncharged semiquinones and a corresponding increase in the overall aromaticity of the material. Journal Article Physical Chemistry Chemical Physics 25 16 11601 11612 Royal Society of Chemistry (RSC) 1463-9076 1463-9084 Copper ions, eumelanin, hydration dependent conductivity 0 0 0 0001-01-01 10.1039/d3cp00975k http://dx.doi.org/10.1039/d3cp00975k COLLEGE NANME Physics COLLEGE CODE SPH Swansea University This work was supported by the Russian Science Foundation, Grant 19-73-10154. A.B.M.’s contribution received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. 663830, through the Sêr Cymru II fellowship. 2023-11-06T12:31:50.0600169 2023-10-03T15:11:04.9660704 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Pavel A. Abramov 0000-0003-3483-3804 1 Sergey S. Zhukov 0000-0001-7268-8666 2 Maxim Savinov 0000-0002-6901-3649 3 Bernard Mostert 0000-0002-9590-2124 4 Konstantin A. Motovilov 0000-0001-7460-7524 5
title The influence of copper ions on the transport and relaxation properties of hydrated eumelanin
spellingShingle The influence of copper ions on the transport and relaxation properties of hydrated eumelanin
Bernard Mostert
title_short The influence of copper ions on the transport and relaxation properties of hydrated eumelanin
title_full The influence of copper ions on the transport and relaxation properties of hydrated eumelanin
title_fullStr The influence of copper ions on the transport and relaxation properties of hydrated eumelanin
title_full_unstemmed The influence of copper ions on the transport and relaxation properties of hydrated eumelanin
title_sort The influence of copper ions on the transport and relaxation properties of hydrated eumelanin
author_id_str_mv a353503c976a7338c7708a32e82f451f
author_id_fullname_str_mv a353503c976a7338c7708a32e82f451f_***_Bernard Mostert
author Bernard Mostert
author2 Pavel A. Abramov
Sergey S. Zhukov
Maxim Savinov
Bernard Mostert
Konstantin A. Motovilov
format Journal article
container_title Physical Chemistry Chemical Physics
container_volume 25
container_issue 16
container_start_page 11601
institution Swansea University
issn 1463-9076
1463-9084
doi_str_mv 10.1039/d3cp00975k
publisher Royal Society of Chemistry (RSC)
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 - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
url http://dx.doi.org/10.1039/d3cp00975k
document_store_str 0
active_str 0
description Eumelanin, the human skin pigment, is a poly-indolequinone material possessing a unique combination of physical and chemical properties. For numerous applications, the conductivity of eumelanin is of paramount importance. However, its hydration dependent conductivity is not well studied using transport-relaxation methods. Furthermore, there is no such work taking into account the simultaneous control of humidity as well as metal ion concentration. Here we present the first such study of the transport and relaxation characteristics of synthetic eumelanin doped with various Cu ion concentrations while controlling the humidity with a frequency range of 10−3 Hz–1 MHz. We found that Cu ions do not cause the appearance of additional relaxation processes, but partially slow down those present in neat eumelanin. In addition, considering previously published work, the key relaxation process observed in doped and undoped materials is associated with the moisture-induced synthesis of uncharged semiquinones and a corresponding increase in the overall aromaticity of the material.
published_date 0001-01-01T12:31:51Z
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score 11.013731

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