Cited by 39Electrostatics and Colloid InteractionsChemical and Physical StudiesSpectroscopy and Quantum Chemical Studies

Breakdown of hydration repulsion between charged surfaces in aqueous Cs+ solutions

Goldberg, Ronit, Chai, Liraz, Perkin, Susan, Kampf, Nir, Klein, Jacob·2008·Physical Chemistry Chemical Physics

Abstract

Using a surface force balance, we have measured the normal and shear forces between mica surfaces across aqueous caesium salt solutions (CsNO(3) and CsCl) up to 100 mM concentrations. In contrast to all other alkali metal ions at these concentrations, we find no evidence of hydration repulsion between the mica surfaces on close approach: the surfaces appear to be largely neutralized by condensation of the Cs ions onto the charged lattice sites, and are attracted on approach into adhesive contact. The contact separation at adhesion indicates that the condensed Cs ions protrude by 0.3 +/- 0.2 nm from each surface, an observation supported both by the relatively weak adhesion energies between the surfaces, and the relatively weak frictional yield stress when they are made to slide past each other. These observations show directly that the hydration shells about the Cs(+) ions are removed as the ions condense into the charged surface lattice. This effect is attributed to the low energies-resulting from their large ionic radius-required for dehydration of these ions.

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Crossref · 10.1039/b807459n

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  • Cs+ does not succeed as a lubricant at all.

    “for this reason it does not succeed as a lubricant at all [129]”

    From Hydration lubrication (2013) · cites this paper as [129]

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Authors
Goldberg, R., Chai, L., Perkin, S., Kampf, N., & Klein, J.
Affiliations
  • Weizmann Institute of Science (IL)
  • University of Oxford (GB)
Corresponding author
Klein, Jacob
Venue
Physical Chemistry Chemical Physics
Published
2008
Volume
10
Issue
32
Pages
4939
ISSN
  • 1463-9076 (ISSN-L)
  • 1463-9084
OpenAlex
W2153574144
Cited by
39
References
43
Citations by year
2026: 2 · 2025: 1 · 2023: 2 · 2022: 3 · 2020: 1 · 2019: 4 · 2018: 5 · 2017: 4 · 2016: 2 · 2015: 2 · 2014: 2 · 2013: 1 · 2012: 5
FWCI
1.02
Type
journal article
Language
en
Open access
closed
Locations
  • Physical Chemistry Chemical Physics (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • Minerva Foundation
  • Israel Science Foundation
Topics
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Electrostatics and Colloid Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Chemical and Physical Studies
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Spectroscopy and Quantum Chemical Studies
Keywords
hydration repulsion, charged surfaces, cesium ions, mica surface, ion condensation, surface adhesion, friction, alkali metal ions, surface force balance, ionic radius, aqueous electrolyte solutions

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