Ion specificity and anomalous electrokinetic effects in hydrophobic nanochannels

Details Ion specificity and anomalous electrokinetic effects in hydrophobic nanochannels Ion specificity and anomalous electrokinetic effects in hydrophobic nanochannels

2007-01-04

arxiv.org/abs/cond-mat/0701072v1

Physical Review Letters, vol. 98, 177801 (2007)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.98.177801

We demonstrate with computer simulations that anomalous electrokinetic effects, such as ion specificity and non-zero zeta potentials for uncharged surfaces, are generic features of electro-osmotic flow in hydrophobic channels. This behavior is due to the stronger attraction of larger ions to the ``vapour--liquid-like'' interface induced by a hydrophobic surface. An analytical model involving a modified Poisson--Boltzmann description for the ion density distributions is proposed, which allows the anomalous flow profiles to be predicted quantitatively. This description incorporates as a crucial component an ion-size-dependent hydrophobic solvation energy. These results provide an effective framework for predicting specific ion effects, with important implications for the modeling of biological problems.

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