The Role of Noise in Determining Selective Ionic Conduction Through Nano-Pores

Gibby, William Alexander Thomas and Barabash, Miraslau and Guardiani, Carlo and Luchinsky, Dmitry and McClintock, Peter Vaughan Elsmere (2019) The Role of Noise in Determining Selective Ionic Conduction Through Nano-Pores. In: 2018 IEEE 13th Nanotechnology Materials and Devices Conference (NMDC). IEEE. ISBN 9781538610176

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The problem of predicting selective transport of ions through nano-pores from their structure in the biological and nano-technological systems is addressed. We use a molecular dynamics simulation to provide insight into the key physical parameters of nano-pores and develop a self-consistent analytic theory describing ionic conduction and selectivity through these devices. We analyse the ion's dehydration and excess chemical potential, derive an expression for the conductivity of the nano-pore, and emphasize the role of fluctuations in its performance. The theory is verified by comparison of the predicted current-voltage characteristics with the molecular dynamics results and experimental data obtained for a graphene nano-pore and the KcsA biological channel.

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25 Jan 2019 16:30
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22 Sep 2023 01:06