Phase Behavior in Suspensions of Highly Charged Colloids.
(2009) In The Journal of Physical Chemistry Part B 113(19). p.6766-6774- Abstract
- Attractive interactions between like-charged aggregates (macromolecules, colloidal particles, or micelles) in solution due to electrostatic correlation effects are revisited. The associated phenomenon of phase separation in a colloidal solution of highly charged particles is directly observed in Monte Carlo simulations. We start with a simple, yet instructive, description of polarization effects in a "cloud" of counterions around a single charged aggregate and show how the ion-ion correlations can be mapped onto a classical analogue of the quantum-mechanical dispersion force. We then extend our treatment to the effective pair interaction between two such aggregates and provide an analysis of different interaction regimes, based on a simple... (More)
- Attractive interactions between like-charged aggregates (macromolecules, colloidal particles, or micelles) in solution due to electrostatic correlation effects are revisited. The associated phenomenon of phase separation in a colloidal solution of highly charged particles is directly observed in Monte Carlo simulations. We start with a simple, yet instructive, description of polarization effects in a "cloud" of counterions around a single charged aggregate and show how the ion-ion correlations can be mapped onto a classical analogue of the quantum-mechanical dispersion force. We then extend our treatment to the effective pair interaction between two such aggregates and provide an analysis of different interaction regimes, based on a simple coupling parameter. By computing the potential of mean force, we illustrate the physics behind the crossover between the regimes of pure repulsion and attraction with increasing counterion valency. Finally, we turn to semi grand NpT simulations of the corresponding bulk systems where mono- and multivalent ions can exchange with an external reservoir. Thus, the coagulation and phase separation phenomena, widely observed and used in real-life applications, are directly studied in these computer simulations. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1392079
- author
- Brukhno, Andrey V ; Åkesson, Torbjörn LU and Jönsson, Bo LU
- organization
- publishing date
- 2009
- type
- Contribution to journal
- publication status
- published
- subject
- in
- The Journal of Physical Chemistry Part B
- volume
- 113
- issue
- 19
- pages
- 6766 - 6774
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000265888100024
- pmid:19368363
- scopus:67650084579
- pmid:19368363
- ISSN
- 1520-5207
- DOI
- 10.1021/jp811147v
- 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
- 40508cda-6455-4e56-8c08-2ecd83a820d7 (old id 1392079)
- date added to LUP
- 2016-04-01 12:57:20
- date last changed
- 2025-04-04 14:38:46
@article{40508cda-6455-4e56-8c08-2ecd83a820d7,
abstract = {{Attractive interactions between like-charged aggregates (macromolecules, colloidal particles, or micelles) in solution due to electrostatic correlation effects are revisited. The associated phenomenon of phase separation in a colloidal solution of highly charged particles is directly observed in Monte Carlo simulations. We start with a simple, yet instructive, description of polarization effects in a "cloud" of counterions around a single charged aggregate and show how the ion-ion correlations can be mapped onto a classical analogue of the quantum-mechanical dispersion force. We then extend our treatment to the effective pair interaction between two such aggregates and provide an analysis of different interaction regimes, based on a simple coupling parameter. By computing the potential of mean force, we illustrate the physics behind the crossover between the regimes of pure repulsion and attraction with increasing counterion valency. Finally, we turn to semi grand NpT simulations of the corresponding bulk systems where mono- and multivalent ions can exchange with an external reservoir. Thus, the coagulation and phase separation phenomena, widely observed and used in real-life applications, are directly studied in these computer simulations.}},
author = {{Brukhno, Andrey V and Åkesson, Torbjörn and Jönsson, Bo}},
issn = {{1520-5207}},
language = {{eng}},
number = {{19}},
pages = {{6766--6774}},
publisher = {{The American Chemical Society (ACS)}},
series = {{The Journal of Physical Chemistry Part B}},
title = {{Phase Behavior in Suspensions of Highly Charged Colloids.}},
url = {{http://dx.doi.org/10.1021/jp811147v}},
doi = {{10.1021/jp811147v}},
volume = {{113}},
year = {{2009}},
}