Number of the records: 1
The influence of copper ions on the transport and relaxation properties of hydrated eumelanin
- 1.
SYSNO ASEP 0571637 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The influence of copper ions on the transport and relaxation properties of hydrated eumelanin Author(s) Abramov, P. A. (RU)
Zhukov, S.S. (RU)
Savinov, Maxim (FZU-D) RID, ORCID
Mostert, A.B. (GB)
Motovilov, K.A. (RU)Number of authors 5 Source Title Physical Chemistry Chemical Physics. - : Royal Society of Chemistry - ISSN 1463-9076
Roč. 25, č. 16 (2023), s. 11601-11612Number of pages 12 s. Language eng - English Country GB - United Kingdom Keywords paramagnetic resonance spectroscopy ; elecron spin resonance ; x-ray characterization ; melanin state proteins Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 000968903700001 EID SCOPUS 85153620990 DOI 10.1039/d3cp00975k Annotation 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. In addition, 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2024 Electronic address https://doi.org/10.1039/d3cp00975k
Number of the records: 1