Ionic correlations at the nanoscale: inversion of selectivity in a bio-nanochannel

Details Ionic correlations at the nanoscale: inversion of selectivity in a bio-nanochannel Ionic correlations at the nanoscale: inversion of selectivity in a bio-nanochannel

2010-05-03

arxiv.org/abs/1005.0278v2

Soft Matter 6, 6079 (2010)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1039/C0SM00904K

Here we show, combining a simulation and theoretical study, that electrostatic correlations typical of multivalent ions can reverse the selectivity of a biological nanochannel. Our results provide a physical mechanism for a new, experimentally observed phenomenon, namely the inversion of the selectivity of a bacterial porin (the E. Coli OmpF) in presence of divalent and trivalent cations. Also, the differences and similarities between the driving force for this phenomenon and other similar nano and micro-escale electrokinetic effects (e.g. inversion of streaming current in silica nanochannels) are explored.

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