The power spectrum of ionic nanopore currents: The role of ion correlations

Zorkot, M.; Golestanian, Ramin; Bonthuis, D. J.

doi:10.1021/acs.nanolett.5b04372

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The power spectrum of ionic nanopore currents: The role of ion correlations

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Golestanian, Ramin
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Zorkot, M., Golestanian, R., & Bonthuis, D. J. (2016). The power spectrum of ionic nanopore currents: The role of ion correlations. Nano Letters, 16(4), 2205-2212. doi:10.1021/acs.nanolett.5b04372.

Cite as: https://hdl.handle.net/21.11116/0000-0001-7618-0

Abstract

We calculate the power spectrum of electric-field-driven ion transport through nanometer-scale membrane pores using both linearized mean-field theory and Langevin dynamics simulations. Remarkably, the linearized mean-field theory predicts a plateau in the power spectral density at low frequency ω, which is confirmed by the simulations at low ion concentration. At high ion concentration, however, the power spectral density follows a power law that is reminiscent of the 1/ωα dependence found experimentally at low frequency. On the basis of simulations with and without ion-ion interactions, we attribute the low-frequency power-law dependence to ion-ion correlations. We show that neither a static surface charge density, nor an increased pore length, nor an increased ion valency have a significant effect on the shape of the power spectral density at low frequency. © 2016 American Chemical Society.