Electrostatic interactions in concentrated colloidal dispersions
(2017) In Physical Chemistry Chemical Physics 19(35). p.2384923853 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 particleparticle 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 particleparticle interaction. At short range this interaction can be determined using the Derjaguin approximation relating the interaction for the planar system to the interparticle force. In the opposite limit the effective potential around the most probable separation is derived assuming pairwise 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 PoissonBoltzmann equation in the cell model.
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 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

 scopus:85029438865
 ISSN
 14639076
 DOI
 10.1039/c7cp02594g
 language
 English
 LU publication?
 yes
 id
 201fc3a2c4f440339f10ac5471790524
 date added to LUP
 20171004 09:54:05
 date last changed
 20180107 12:20:32
@article{201fc3a2c4f440339f10ac5471790524, 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 particleparticle interaction. At short range this interaction can be determined using the Derjaguin approximation relating the interaction for the planar system to the interparticle force. In the opposite limit the effective potential around the most probable separation is derived assuming pairwise 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 PoissonBoltzmann equation in the cell model.</p>}, author = {Wennerström, Håkan}, issn = {14639076}, language = {eng}, number = {35}, pages = {2384923853}, 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}, volume = {19}, year = {2017}, }