This article has an erratum: [erratum]
Volume 78, Number 3, May 2007
|Number of page(s)||5|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||17 April 2007|
Interaction between charged colloids in a low dielectric constant solvent
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
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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