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      Charge Inversion of Divalent Ionic Solutions in Silica Channels

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          Abstract

          Recent experiments (F.H.J. Van Der Heyden et al., PRL 96, 224502 (2006)) of streaming currents in silica nanochannels with divalent ions report charge inversion, i.e. interfacial charges attracting counterions in excess of their own nominal charge, in conflict with existing theoretical and simulation results. We reveal the mechanism of charge inversion by using all-atomic molecular dynamics simulations. Our results show excellent agreement with experiments, both qualitatively and quantitatively. We further discuss the implications of our study for the general problem of ionic correlations in solutions as well as in regards of the properties of silica-water interfaces.

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          Author and article information

          Journal
          24 June 2007
          Article
          10.1103/PhysRevE.75.061202
          0706.3514
          40f648a8-770c-46e3-8332-d9b9ae221d91
          History
          Custom metadata
          Phys. Rev. E 75, 061202 (2007)
          5 pages, 5 figures
          cond-mat.mtrl-sci

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