Attraction between like-charged monovalent ions

The Journal of Chemical Physics
Ronen Zangi

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 involv...Continue Reading

References

Jul 23, 2004·The Journal of Chemical Physics·Ronen Zangi, Alan E Mark
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Mar 24, 2007·Journal of the American Chemical Society·Ronen ZangiB J Berne
Feb 12, 2009·The Journal of Physical Chemistry. B·Christopher J FennellKen A Dill
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Dec 10, 2009·The Journal of Physical Chemistry. B·Ronen Zangi
Feb 22, 2011·The Journal of Physical Chemistry. B·Ronen Zangi
Mar 1, 2008·Journal of Chemical Theory and Computation·Berk HessErik Lindahl

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Citations

Sep 6, 2012·The Journal of Physical Chemistry. a·Berhane TemelsoGeorge C Shields
Sep 10, 2013·The Journal of Physical Chemistry. a·Alireza ShokriSteven R Kass
Mar 15, 2013·Physical Chemistry Chemical Physics : PCCP·Dongseon LeeChaok Seok
Jun 4, 2014·Proceedings of the National Academy of Sciences of the United States of America·Vasudevan VenkateshwaranShekhar Garde
Mar 15, 2014·The Journal of Physical Chemistry. B·Miha LukšičKen A Dill
Jun 10, 2015·Physical Chemistry Chemical Physics : PCCP·Manik Kumer GhoshCheol Ho Choi
Jul 13, 2013·The Journal of Physical Chemistry. B·Cheol Ho ChoiYuji Sugita
Jan 1, 2018·The Journal of Chemical Physics·Alexandros Chremos, Jack F Douglas
Sep 12, 2019·Physical Chemistry Chemical Physics : PCCP·Sibananda G Dash, Tejender S Thakur
Mar 16, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Rafał WysokińskiSteve Scheiner
Jun 23, 2021·Physical Chemistry Chemical Physics : PCCP·Rafał WysokińskiSteve Scheiner
Apr 23, 2019·The Journal of Physical Chemistry. B·Myong In OhDonald F Weaver
May 26, 2018·Accounts of Chemical Research·Mario VazdarPavel Jungwirth
Oct 2, 2021·The Journal of Physical Chemistry. B·Sergey E Kruchinin, Marina V Fedotova

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Methods Mentioned

BETA
x-ray diffractions

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