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Macroscopic conductivity of aqueous electrolyte solutions scales with ultrafast microscopic ion motions
Despite the widespread use of aqueous electrolytes as conductors, the molecular mechanism of ionic conductivity at moderate to high electrolyte concentrations remains largely unresolved. Using a combination of dielectric spectroscopy and molecular dynamics simulations, we show that the absorption of...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7109088/ https://www.ncbi.nlm.nih.gov/pubmed/32235854 http://dx.doi.org/10.1038/s41467-020-15450-2 |
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author | Balos, Vasileios Imoto, Sho Netz, Roland R. Bonn, Mischa Bonthuis, Douwe Jan Nagata, Yuki Hunger, Johannes |
author_facet | Balos, Vasileios Imoto, Sho Netz, Roland R. Bonn, Mischa Bonthuis, Douwe Jan Nagata, Yuki Hunger, Johannes |
author_sort | Balos, Vasileios |
collection | PubMed |
description | Despite the widespread use of aqueous electrolytes as conductors, the molecular mechanism of ionic conductivity at moderate to high electrolyte concentrations remains largely unresolved. Using a combination of dielectric spectroscopy and molecular dynamics simulations, we show that the absorption of electrolytes at ~0.3 THz sensitively reports on the local environment of ions. The magnitude of these high-frequency ionic motions scales linearly with conductivity for a wide range of ions and concentrations. This scaling is rationalized within a harmonic oscillator model based on the potential of mean force extracted from simulations. Our results thus suggest that long-ranged ionic transport is intimately related to the local energy landscape and to the friction for short-ranged ion dynamics: a high macroscopic electrolyte conductivity is thereby shown to be related to large-amplitude motions at a molecular scale. |
format | Online Article Text |
id | pubmed-7109088 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-71090882020-04-03 Macroscopic conductivity of aqueous electrolyte solutions scales with ultrafast microscopic ion motions Balos, Vasileios Imoto, Sho Netz, Roland R. Bonn, Mischa Bonthuis, Douwe Jan Nagata, Yuki Hunger, Johannes Nat Commun Article Despite the widespread use of aqueous electrolytes as conductors, the molecular mechanism of ionic conductivity at moderate to high electrolyte concentrations remains largely unresolved. Using a combination of dielectric spectroscopy and molecular dynamics simulations, we show that the absorption of electrolytes at ~0.3 THz sensitively reports on the local environment of ions. The magnitude of these high-frequency ionic motions scales linearly with conductivity for a wide range of ions and concentrations. This scaling is rationalized within a harmonic oscillator model based on the potential of mean force extracted from simulations. Our results thus suggest that long-ranged ionic transport is intimately related to the local energy landscape and to the friction for short-ranged ion dynamics: a high macroscopic electrolyte conductivity is thereby shown to be related to large-amplitude motions at a molecular scale. Nature Publishing Group UK 2020-03-31 /pmc/articles/PMC7109088/ /pubmed/32235854 http://dx.doi.org/10.1038/s41467-020-15450-2 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Balos, Vasileios Imoto, Sho Netz, Roland R. Bonn, Mischa Bonthuis, Douwe Jan Nagata, Yuki Hunger, Johannes Macroscopic conductivity of aqueous electrolyte solutions scales with ultrafast microscopic ion motions |
title | Macroscopic conductivity of aqueous electrolyte solutions scales with ultrafast microscopic ion motions |
title_full | Macroscopic conductivity of aqueous electrolyte solutions scales with ultrafast microscopic ion motions |
title_fullStr | Macroscopic conductivity of aqueous electrolyte solutions scales with ultrafast microscopic ion motions |
title_full_unstemmed | Macroscopic conductivity of aqueous electrolyte solutions scales with ultrafast microscopic ion motions |
title_short | Macroscopic conductivity of aqueous electrolyte solutions scales with ultrafast microscopic ion motions |
title_sort | macroscopic conductivity of aqueous electrolyte solutions scales with ultrafast microscopic ion motions |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7109088/ https://www.ncbi.nlm.nih.gov/pubmed/32235854 http://dx.doi.org/10.1038/s41467-020-15450-2 |
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