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

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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-7618-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-7619-F
Genre: Journal Article

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Zorkot, M., Author
Golestanian, Ramin1, Author              
Bonthuis, D. J., Author
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1Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2570692              

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 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.

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Language(s): eng - English
 Dates: 2016-02-252016
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.nanolett.5b04372
BibTex Citekey: Zorkot2016a
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Title: Nano Letters
Source Genre: Journal
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Pages: - Volume / Issue: 16 (4) Sequence Number: - Start / End Page: 2205 - 2212 Identifier: -