Charge Inversion of Divalent Ionic Solutions in Silica Channels
arXiv:0706.3514 · doi:10.1103/PhysRevE.75.061202
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.
5 pages, 5 figures
References in corpus (5)
- Electrostatic correlations: from Plasma to Biology
- Screening of a macroion by multivalent ions: Correlation induced inversion of charge
- Statics and Dynamics of Strongly Charged Soft Matter
- Bjerrum pairing correlations at charged interfaces
- The many origins of charge inversion in electrolyte solutions: effects of discrete interfacial charges