On the stability of aqueous dispersions containing conducting colloidal particles.
(2015) In Soft Matter 11(20). p.4011-4021- Abstract
- We use a combination of simulations and a simple theoretical approach to investigate interactions between neutral conducting surfaces, immersed in an electrolyte solution. The study is conducted at the primitive model level, which necessitates the use of multiple image reflections. Our approximate theory is based on a classical density functional formulation of Poisson-Boltzmann theory. The same approach can in principle also be imported to more advanced treatments, where ion correlations are accounted for. An important limiting result that guides our treatment of the image forces, is that the repulsive salt-induced interactions cancel the attractive zero frequency van der Waals attraction at long range. That is, at vanishing frequency,... (More)
- We use a combination of simulations and a simple theoretical approach to investigate interactions between neutral conducting surfaces, immersed in an electrolyte solution. The study is conducted at the primitive model level, which necessitates the use of multiple image reflections. Our approximate theory is based on a classical density functional formulation of Poisson-Boltzmann theory. The same approach can in principle also be imported to more advanced treatments, where ion correlations are accounted for. An important limiting result that guides our treatment of the image forces, is that the repulsive salt-induced interactions cancel the attractive zero frequency van der Waals attraction at long range. That is, at vanishing frequency, the van der Waals interaction between the conducting surfaces is, at large separations, perfectly screened by the intervening salt solution. The simulations are computationally intensive, due to a strong dependence upon the number of image reflections used, with especially poor convergence when an odd number of images is used. We demonstrate that our approximate density functional approach is remarkably accurate, even in the presence of a 2 : 1 salt, or when the surfaces preferentially adsorb one ion species. The former observation was rather unexpected, given the lack of ion correlations within our mean-field treatment, and is most likely due to a cancellation between two opposing effects, both of which are generated by ion correlations. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/5341020
- author
- Szparaga, Ryan LU ; Woodward, Clifford E and Forsman, Jan LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Soft Matter
- volume
- 11
- issue
- 20
- pages
- 4011 - 4021
- publisher
- Royal Society of Chemistry
- external identifiers
-
- pmid:25899056
- wos:000354449100008
- scopus:84929377507
- pmid:25899056
- ISSN
- 1744-6848
- DOI
- 10.1039/c5sm00161g
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Theoretical Chemistry (S) (011001039)
- id
- 2b4ed179-1a89-4627-9019-614845e28efc (old id 5341020)
- date added to LUP
- 2016-04-01 10:00:53
- date last changed
- 2023-01-02 00:20:10
@article{2b4ed179-1a89-4627-9019-614845e28efc,
abstract = {{We use a combination of simulations and a simple theoretical approach to investigate interactions between neutral conducting surfaces, immersed in an electrolyte solution. The study is conducted at the primitive model level, which necessitates the use of multiple image reflections. Our approximate theory is based on a classical density functional formulation of Poisson-Boltzmann theory. The same approach can in principle also be imported to more advanced treatments, where ion correlations are accounted for. An important limiting result that guides our treatment of the image forces, is that the repulsive salt-induced interactions cancel the attractive zero frequency van der Waals attraction at long range. That is, at vanishing frequency, the van der Waals interaction between the conducting surfaces is, at large separations, perfectly screened by the intervening salt solution. The simulations are computationally intensive, due to a strong dependence upon the number of image reflections used, with especially poor convergence when an odd number of images is used. We demonstrate that our approximate density functional approach is remarkably accurate, even in the presence of a 2 : 1 salt, or when the surfaces preferentially adsorb one ion species. The former observation was rather unexpected, given the lack of ion correlations within our mean-field treatment, and is most likely due to a cancellation between two opposing effects, both of which are generated by ion correlations.}},
author = {{Szparaga, Ryan and Woodward, Clifford E and Forsman, Jan}},
issn = {{1744-6848}},
language = {{eng}},
number = {{20}},
pages = {{4011--4021}},
publisher = {{Royal Society of Chemistry}},
series = {{Soft Matter}},
title = {{On the stability of aqueous dispersions containing conducting colloidal particles.}},
url = {{https://lup.lub.lu.se/search/files/27853153/manuscript_revised.pdf}},
doi = {{10.1039/c5sm00161g}},
volume = {{11}},
year = {{2015}},
}