<div class="csl-bib-body">
<div class="csl-entry">Ramach, U., Lee, J., Altmann, F., Schussek, M., Olgiati, M., Dziadkowiec, J., Mears, L., Celebi, A. T., Lee, D. W., & Valtiner, M. (2023). Real-time visualisation of ion exchange in molecularly confined spaces where electric double layers overlap. <i>Faraday Discussions</i>, <i>246</i>, 487–507. https://doi.org/10.1039/D3FD00038A</div>
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dc.identifier.issn
1359-6640
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/190074
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dc.description.abstract
Ion interactions with interfaces and transport in confined spaces, where electric double layers overlap, are essential in many areas, ranging from crevice corrosion to understanding and creating nano-fluidic devices at the sub 10 nm scale. Tracking the spatial and temporal evolution of ion exchange, as well as local surface potentials, in such extreme confinement situations is both experimentally and theoretically challenging. Here, we track in real-time the transport processes of ionic species (LiClO4) confined between a negatively charged mica surface and an electrochemically modulated gold surface using a high-speed in situ sensing Surface Forces Apparatus. With millisecond temporal and sub-micrometer spatial resolution we capture the force and distance equilibration of ions in the confinement of D z 2–3 nm in an overlapping electric double layer (EDL) during ion exchange. Our data indicate that an equilibrated ion concentration front progresses with a velocity of 100–200 mm s−1 into a confined nano-slit. This is in the same order of magnitude and in agreement with continuum estimates from diffusive mass transport calculations. We also compare the ion structuring using high resolution imaging, molecular dynamics simulations, and calculations based on a continuum model for the EDL. With this data we can predict the amount of ion exchange, as well as the force between the two surfaces due to overlapping EDLs, and critically discuss experimental and theoretical limitations and possibilities.
en
dc.description.sponsorship
Europäischer Forschungsrat (ERC)
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dc.language.iso
en
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dc.publisher
ROYAL SOC CHEMISTRY
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dc.relation.ispartof
Faraday Discussions
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dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
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dc.subject
Ion exchange
en
dc.subject
Surface force apparatus
en
dc.subject
Molecular dynamics
en
dc.subject
Atomic force microscopy
en
dc.title
Real-time visualisation of ion exchange in molecularly confined spaces where electric double layers overlap
en
dc.type
Article
en
dc.type
Artikel
de
dc.rights.license
Creative Commons Attribution 3.0 Unported
en
dc.rights.license
Creative Commons Namensnennung 3.0 Unported
de
dc.contributor.affiliation
Ulsan National Institute of Science and Technology, Korea (the Republic of)
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dc.contributor.affiliation
University of Oslo, Norway
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dc.contributor.affiliation
Ulsan National Institute of Science and Technology, Korea (the Republic of)