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Solvent-mediated forces between ellipsoidal nanoparticles adsorbed at liquid-vapor interfaces.
File(s)
la0c02243_si_002.pdf (2.7 MB)
Supporting information
acs.langmuir.0c02243.pdf (3.12 MB)
Published version
Author(s)
Galteland, Olav
Bresme, Fernando
Hafskjold, Bjørn
Type
Journal Article
Abstract
Classical capillary theory predicts that a non-neutrally wetting ellipsoidal particle adsorbed at a liquid-vapor interface will deform the interface. The deformation gives rise to anisotropic capillary forces of a quadrupolar nature that induce strong directionality in the particle interactions. Here, we investigate the interactions between nanoparticles with characteristic lengths of 1-5 nm. We show that the near-field interactions are dominated by solvent-mediated forces, which arise from the fluid packing between the nanoparticles and direct nanoparticle-nanoparticle interactions. The solvent-mediated forces are two orders of magnitude larger than the estimated capillary force. We find that interacting ellipsoidal nanoparticles adsorbed at the liquid-vapor interface have a larger repulsion in the depletion region than the nanoparticles submerged in a dense bulk phase and argue that this is because of a negative line tension associated with the three-phase line.
Date Issued
2020-12-08
Date Acceptance
2020-11-20
Citation
Langmuir: the ACS journal of surfaces and colloids, 2020, 36 (48), pp.14530-14538
URI
URL
DOI
ISSN
0743-7463
Publisher
American Chemical Society
Start Page
14530
End Page
14538
Journal / Book Title
Langmuir: the ACS journal of surfaces and colloids
Volume
36
Issue
48
Copyright Statement
© 2020 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY)
License, which permits unrestricted use, distribution and reproduction in any medium,
provided the author and source are cited http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html.
License URL
Sponsor
The Leverhulme Trust
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/33236631
Grant Number
RPG-2018-384
Subjects
Chemical Physics
Publication Status
Published
Coverage Spatial
United States
Date Publish Online
2020-11-25