| Issue |
EPL
Volume 78, Number 3, May 2007
|
|
|---|---|---|
| Article Number | 38002 | |
| Number of page(s) | 5 | |
| Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
| DOI | https://doi.org/10.1209/0295-5075/78/38002 | |
| Published online | 17 April 2007 | |
Interaction between charged colloids in a low dielectric constant solvent
1
Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf - D-40225 Düsseldorf, Germany
2
Institute for High Temperatures, Russian Academy of Sciences - Izhorskaya 13/19, 117419 Moscow, Russia
3
Dipartimento di Fisica and CNR-INFM-SOFT, Università di Roma La Sapienza - P.le A. Moro 2, I-00185 Roma, Italy
4
Dipartimento di Fisica and CNR-INFM-SMC, Università di Roma La Sapienza - P.le A. Moro 2, I-00185 Roma, Italy
Received:
9
December
2006
Accepted:
21
March
2007
Based on computer simulations of the primitive model of electrolytes, we show that the effective interaction between low-charge colloids in solvents of low or moderate dielectric constant depends crucially on the salt concentration. While in the absence of salt the interaction is repulsive in agreement with Derjaguin-Landau-Verwey-Overbeek theory, depletion of salt Bjerrum pairs around the colloids leads to an attraction between like-charge colloids even at small salt concentrations.
PACS: 82.70.Dd – Colloids / 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc. / 87.15.Aa – Theory and modeling; computer simulation
© Europhysics Letters Association, 2007
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