Electrostatic interactions in concentrated colloidal dispersions
(2017) In Physical Chemistry Chemical Physics 19(35). p.23849-23853- Abstract
An explicit expression, free from adjustable parameters, is derived for the effective pair interaction between charged colloidal spheres at high concentration in a medium containing an electrolyte. This is accomplished by first considering the electrostatic interaction between two infinite charged plates placed in a stack of identical plates. These act as a reservoir defining the chemical potentials of solvent and electrolyte ions in a way that depends on the plate separation in the stack. The results for the planar case are then applied to a suspension of identical charged spheres. Also for this case the concentration defines the properties of a reservoir quantitatively affecting the particle-particle interaction. At short range this... (More)
An explicit expression, free from adjustable parameters, is derived for the effective pair interaction between charged colloidal spheres at high concentration in a medium containing an electrolyte. This is accomplished by first considering the electrostatic interaction between two infinite charged plates placed in a stack of identical plates. These act as a reservoir defining the chemical potentials of solvent and electrolyte ions in a way that depends on the plate separation in the stack. The results for the planar case are then applied to a suspension of identical charged spheres. Also for this case the concentration defines the properties of a reservoir quantitatively affecting the particle-particle interaction. At short range this interaction can be determined using the Derjaguin approximation relating the interaction for the planar system to the inter-particle force. In the opposite limit the effective potential around the most probable separation is derived assuming pair-wise additive interactions from nearest neighbors. For very concentrated systems the Derjaguin approximation can be used. For a more dilute system an effective local potential is derived based on solutions of the Poisson-Boltzmann equation in the cell model.
(Less)
- author
- Wennerström, Håkan LU
- organization
- publishing date
- 2017
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Chemistry Chemical Physics
- volume
- 19
- issue
- 35
- pages
- 5 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- pmid:28722744
- scopus:85029438865
- ISSN
- 1463-9076
- DOI
- 10.1039/c7cp02594g
- language
- English
- LU publication?
- yes
- id
- 201fc3a2-c4f4-4033-9f10-ac5471790524
- date added to LUP
- 2017-10-04 09:54:05
- date last changed
- 2024-10-14 14:10:30
@article{201fc3a2-c4f4-4033-9f10-ac5471790524,
abstract = {{<p>An explicit expression, free from adjustable parameters, is derived for the effective pair interaction between charged colloidal spheres at high concentration in a medium containing an electrolyte. This is accomplished by first considering the electrostatic interaction between two infinite charged plates placed in a stack of identical plates. These act as a reservoir defining the chemical potentials of solvent and electrolyte ions in a way that depends on the plate separation in the stack. The results for the planar case are then applied to a suspension of identical charged spheres. Also for this case the concentration defines the properties of a reservoir quantitatively affecting the particle-particle interaction. At short range this interaction can be determined using the Derjaguin approximation relating the interaction for the planar system to the inter-particle force. In the opposite limit the effective potential around the most probable separation is derived assuming pair-wise additive interactions from nearest neighbors. For very concentrated systems the Derjaguin approximation can be used. For a more dilute system an effective local potential is derived based on solutions of the Poisson-Boltzmann equation in the cell model.</p>}},
author = {{Wennerström, Håkan}},
issn = {{1463-9076}},
language = {{eng}},
number = {{35}},
pages = {{23849--23853}},
publisher = {{Royal Society of Chemistry}},
series = {{Physical Chemistry Chemical Physics}},
title = {{Electrostatic interactions in concentrated colloidal dispersions}},
url = {{http://dx.doi.org/10.1039/c7cp02594g}},
doi = {{10.1039/c7cp02594g}},
volume = {{19}},
year = {{2017}},
}