Measurements of the size and correlations between ions using an electrolytic point contact



The size of an ion affects everything from the structure of water to life itself. In this report, to gauge their size, ions dissolved in water are forced electrically through a sub-nanometer- diameter pore spanning a thin membrane and the current is measured. The measurements reveal an ion-selective conductance that vanishes in pores <0.24 nm in diameter—the size of a water molecule—indicating that permeating ions have a grossly distorted hydration shell. Analysis of the current noise power spectral density exposes a threshold, below which the noise is independent of current, and beyond which it increases quadratically. This depen- dence proves that the spectral density, which is uncorrelated below threshold, becomes correlated above it. The onset of correlations for Li+, Mg2+, Na+ and K+-ions extrapolates to pore diameters of 0.13 ± 0.11nm, 0.16 ± 0.11nm, 0.22 ± 0.11nm and 0.25 ± 0.11nm, respectively—consonant with diameters at which the conductance vanishes and consistent with ions moving through the sub-nanopore with distorted hydration shells in a correlated way.


Attribute NameValues
  • Eveline Rigo

  • Zhuzin Dong

  • Jae Hyun Park

  • Eamonn Kennedy

  • Mohammad Hokmabadi

  • Lisa Almonte-Garcia

  • Li Ding

  • Narayana Aluru

  • Gregory Timp

Journal or Work Title
  • Nature Communications

  • 10

  • 1

First Page
  • 2382

  • 2041-1723

  • 4146701910265

  • Titan TEM

  • Nature

Date Created
  • 2019-08-20

  • English

Departments and Units
Record Visibility Public
Content License
  • All rights reserved

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