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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

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Size effect in ion transport through angstrom-scale slits.

A Esfandiar¹, B Radha^1,2, F C Wang^1,3

¹School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.

Science (New York, N.Y.)

|October 28, 2017

Summary

Researchers created angstrom-scale slits for ion transport studies. Even large ions permeated these narrow channels, revealing steric effects and size-dependent ion behavior in nanofluidics.

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Area of Science:

Nanofluidics
Materials Science
Physical Chemistry

Background:

Controllable fabrication of angstrom-scale capillaries is a significant challenge in nanofluidics.
Understanding ion transport at the atomic scale is crucial for developing advanced nanoscale technologies.

Purpose of the Study:

To investigate ion transport through angstrom-scale slits fabricated by removing a single atomic plane.
To elucidate the role of steric effects and confinement on ion permeation and mobility.

Main Methods:

Fabrication of atomically flat angstrom-scale slits by single atomic plane removal.
Experimental measurement of ion transport through these narrow slits.
Analysis of ion mobility and selectivity based on size and charge.

Main Results:

Ions with hydrated diameters larger than the slit size were observed to permeate.
Permeation was accompanied by reduced ion mobility due to steric hindrance.
A notable asymmetry in transport was observed between anions and cations of similar diameters.

Conclusions:

Atomically flat angstrom-scale slits enable the study of fundamental ion transport phenomena.
Steric effects play a significant role in ion transport through sub-nanometer confinements.
This work provides a platform for advancing nanofluidics, molecular separation, and nanoscale device development.