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• W2068744384 abstract "Ions with like-charges repel each other with a magnitude given by the Coulomb law. The repulsion is also known to persist in aqueous solutions albeit factored by the medium's dielectric constant. In this paper, we report results from molecular dynamics simulations of alkali halides salt solutions indicating an effective attraction between some of the like-charged monovalent ions. The attraction is observed between anions, as well as between cations, leading to the formation of dimers with lifetimes on the order of few picoseconds. Two mechanisms have been identified to drive this counterintuitive attraction. The first is exhibited by high-charge density ions, such as fluoride, at low salt concentrations, yielding effective attractions with magnitude up to the order of 1-2 kT. In this case, the stronger local electric field generated when the two ions are in contact augments the alignment of neighboring waters toward the ions. This results in a gain of substantial favorable ion-water interaction energy. For fluorides, this interaction constitutes the major change among the different energy components compensating for the anion-anion repulsion, and therefore, rendering like-charge association possible. The second mechanism involves mediation by counterions, the attractions increase with salt concentration and are characterized by small magnitudes. In particular, clusters of ion triplets, in which a counterion is either bridging the two like-charged ions or is paired to only one of them, are formed. Although these two mechanisms may not yield net attractions in many cases, they might still be operational and significant, explaining effective repulsions between like-charged ions with magnitudes much smaller than expected based on continuum electrostatics." @default.
• W2068744384 created "2016-06-24" @default.
• W2068744384 creator A5016053493 @default.
• W2068744384 date "2012-05-08" @default.
• W2068744384 modified "2023-09-27" @default.
• W2068744384 title "Attraction between like-charged monovalent ions" @default.
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• W2068744384 doi "https://doi.org/10.1063/1.4705692" @default.
• W2068744384 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22583294" @default.
• W2068744384 hasPublicationYear "2012" @default.
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