Strong Attraction between Charged Spheres due to Metastable Ionized States

Details Strong Attraction between Charged Spheres due to Metastable Ionized States Strong Attraction between Charged Spheres due to Metastable Ionized States

2000-06-30

arxiv.org/abs/cond-mat/0006493v3

Phys. Rev. Lett., VOL 85, p. 872 (24 July 2000)

Physics

Condensed Matter

Soft Condensed Matter

REVTEX-published version

Scientific paper

10.1103/PhysRevLett.85.872

We report a mechanism which can lead to long range attractions between like-charged spherical macroions, stemming from the existence of metastable ionized states. We show that the ground state of a single highly charged colloid plus a few excess counterions is overcharged. For the case of two highly charged macroions in their neutralizing divalent counterion solution we demonstrate that, in the regime of strong Coulomb coupling, the counterion clouds are very likely to be unevenly distributed, leading to one overcharged and one undercharged macroion. This long-living metastable configuration in turn leads to a long range Coulomb attraction.

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