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Type: Journal article
Title: Ion-specific anomalous electrokinetic effects in hydrophobic nanochannels
Author: Huang, D.
Cottin-Bizonne, C.
Ybert, C.
Bocquet, L.
Citation: Physical Review Letters, 2007; 98(17):1-4
Publisher: American Physical Soc
Issue Date: 2007
ISSN: 0031-9007
Statement of
David M. Huang, Cécile Cottin-Bizonne, Christophe Ybert, and Lydéric Bocquet
Abstract: We show with computer simulations that anomalous electrokinetic effects, such as ion specificity and nonzero 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 “vapor-liquidlike” interface induced by a hydrophobic surface. We propose an analytical model involving a modified Poisson-Boltzmann description for the ion density distributions that quantitatively predicts the anomalous flow profiles. This description includes as a crucial component an ion-size-dependent hydrophobic solvation energy. These results provide an effective framework for predicting ion-specific effects, with potentially important implications for biological modeling.
Keywords: Sodium Chloride; Ions; Sodium Iodide; Electric Conductivity; Models, Biological; Nanostructures; Computer Simulation; Hydrophobic and Hydrophilic Interactions
Rights: ©2007 American Physical Society
RMID: 0020107482
DOI: 10.1103/PhysRevLett.98.177801
Appears in Collections:Chemistry publications

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