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A gateway for ion transport on gas bubbles pinned onto solids

Gas bubbles grown on solids are more than simple vehicles for gas transport. They are charged particles with surfaces populated with exchangeable ions. We here unveil a gateway for alkali metal ion transport between oxygen bubbles and semi-conducting (iron oxide) and conducting (gold) surfaces. This...

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Autores principales: Haziri, Veton, Nha, Tu Pham Tran, Berisha, Avni, Boily, Jean-François
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9814891/
https://www.ncbi.nlm.nih.gov/pubmed/36697541
http://dx.doi.org/10.1038/s42004-021-00481-7
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author Haziri, Veton
Nha, Tu Pham Tran
Berisha, Avni
Boily, Jean-François
author_facet Haziri, Veton
Nha, Tu Pham Tran
Berisha, Avni
Boily, Jean-François
author_sort Haziri, Veton
collection PubMed
description Gas bubbles grown on solids are more than simple vehicles for gas transport. They are charged particles with surfaces populated with exchangeable ions. We here unveil a gateway for alkali metal ion transport between oxygen bubbles and semi-conducting (iron oxide) and conducting (gold) surfaces. This gateway was identified by electrochemical impedance spectroscopy using an ultramicroelectrode in direct contact with bubbles pinned onto these solid surfaces. We show that this gateway is naturally present at open circuit potentials, and that negative electric potentials applied through the solid enhance ion transport. In contrast, positive potentials or contact with an insulator (polytetrafluoroethylene) attenuates transport. We propose that this gateway is generated by overlapping electric double layers of bubbles and surfaces of contrasting (electro)chemical potentials. Knowledge of this ion transfer phenomenon is essential for understanding electric shielding and reaction overpotential caused by bubbles on catalysts. This has especially important ramifications for predicting processes including mineral flotation, microfluidics, pore water geochemistry, and fuel cell technology.
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spelling pubmed-98148912023-01-10 A gateway for ion transport on gas bubbles pinned onto solids Haziri, Veton Nha, Tu Pham Tran Berisha, Avni Boily, Jean-François Commun Chem Article Gas bubbles grown on solids are more than simple vehicles for gas transport. They are charged particles with surfaces populated with exchangeable ions. We here unveil a gateway for alkali metal ion transport between oxygen bubbles and semi-conducting (iron oxide) and conducting (gold) surfaces. This gateway was identified by electrochemical impedance spectroscopy using an ultramicroelectrode in direct contact with bubbles pinned onto these solid surfaces. We show that this gateway is naturally present at open circuit potentials, and that negative electric potentials applied through the solid enhance ion transport. In contrast, positive potentials or contact with an insulator (polytetrafluoroethylene) attenuates transport. We propose that this gateway is generated by overlapping electric double layers of bubbles and surfaces of contrasting (electro)chemical potentials. Knowledge of this ion transfer phenomenon is essential for understanding electric shielding and reaction overpotential caused by bubbles on catalysts. This has especially important ramifications for predicting processes including mineral flotation, microfluidics, pore water geochemistry, and fuel cell technology. Nature Publishing Group UK 2021-03-25 /pmc/articles/PMC9814891/ /pubmed/36697541 http://dx.doi.org/10.1038/s42004-021-00481-7 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Haziri, Veton
Nha, Tu Pham Tran
Berisha, Avni
Boily, Jean-François
A gateway for ion transport on gas bubbles pinned onto solids
title A gateway for ion transport on gas bubbles pinned onto solids
title_full A gateway for ion transport on gas bubbles pinned onto solids
title_fullStr A gateway for ion transport on gas bubbles pinned onto solids
title_full_unstemmed A gateway for ion transport on gas bubbles pinned onto solids
title_short A gateway for ion transport on gas bubbles pinned onto solids
title_sort gateway for ion transport on gas bubbles pinned onto solids
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9814891/
https://www.ncbi.nlm.nih.gov/pubmed/36697541
http://dx.doi.org/10.1038/s42004-021-00481-7
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