Interactions between conducting surfaces in salt solutions
(2022) In Soft Matter 18(8). p.1636-1643- Abstract
In this work, we simulate interactions between two perfectly conducting surfaces, immersed in a salt solution. We demonstrate that these forces are quantitatively different from those between (equally charged) non-conducting surfaces. There is, for instance, a significant repulsion between net neutral surfaces. On the other hand, there are also qualitative similarities, with behaviours found with non-conducting surfaces. For instance, there is a non-monotonic dependence of the free energy barrier height, on the salt concentration, and the minimum essentially coincides with a flat profile of the apparent surface charge density (i.e. the effective net surface charge density, some distance away from the surface, when accounting for ion... (More)
In this work, we simulate interactions between two perfectly conducting surfaces, immersed in a salt solution. We demonstrate that these forces are quantitatively different from those between (equally charged) non-conducting surfaces. There is, for instance, a significant repulsion between net neutral surfaces. On the other hand, there are also qualitative similarities, with behaviours found with non-conducting surfaces. For instance, there is a non-monotonic dependence of the free energy barrier height, on the salt concentration, and the minimum essentially coincides with a flat profile of the apparent surface charge density (i.e. the effective net surface charge density, some distance away from the surface, when accounting for ion neutralization), outside the so-called Stern layer. These conditions can be described as "perfect surface charge neutralization". Despite observed quantitative differences, we demonstrate that it might be possible to mimic a dispersion containing charged colloidal metal particles by a simpler model system with charged non-conducting particles, using modified particle-ion interactions. This journal is
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- author
- Stenberg, Samuel LU ; Woodward, Clifford E. and Forsman, Jan LU
- organization
- publishing date
- 2022-02-28
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Soft Matter
- volume
- 18
- issue
- 8
- pages
- 8 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- scopus:85125020696
- pmid:35118484
- ISSN
- 1744-683X
- DOI
- 10.1039/d1sm01520f
- language
- English
- LU publication?
- yes
- id
- 4e48ea59-2168-42dc-a2e4-9478db8c6f93
- date added to LUP
- 2022-06-14 13:25:21
- date last changed
- 2024-07-11 09:15:21
@article{4e48ea59-2168-42dc-a2e4-9478db8c6f93,
abstract = {{<p>In this work, we simulate interactions between two perfectly conducting surfaces, immersed in a salt solution. We demonstrate that these forces are quantitatively different from those between (equally charged) non-conducting surfaces. There is, for instance, a significant repulsion between net neutral surfaces. On the other hand, there are also qualitative similarities, with behaviours found with non-conducting surfaces. For instance, there is a non-monotonic dependence of the free energy barrier height, on the salt concentration, and the minimum essentially coincides with a flat profile of the apparent surface charge density (i.e. the effective net surface charge density, some distance away from the surface, when accounting for ion neutralization), outside the so-called Stern layer. These conditions can be described as "perfect surface charge neutralization". Despite observed quantitative differences, we demonstrate that it might be possible to mimic a dispersion containing charged colloidal metal particles by a simpler model system with charged non-conducting particles, using modified particle-ion interactions. This journal is </p>}},
author = {{Stenberg, Samuel and Woodward, Clifford E. and Forsman, Jan}},
issn = {{1744-683X}},
language = {{eng}},
month = {{02}},
number = {{8}},
pages = {{1636--1643}},
publisher = {{Royal Society of Chemistry}},
series = {{Soft Matter}},
title = {{Interactions between conducting surfaces in salt solutions}},
url = {{http://dx.doi.org/10.1039/d1sm01520f}},
doi = {{10.1039/d1sm01520f}},
volume = {{18}},
year = {{2022}},
}