Size effect in ion transport through angstrom-scale slits

Science
A EsfandiarK Gopinadhan

Abstract

In the field of nanofluidics, it has been an ultimate but seemingly distant goal to controllably fabricate capillaries with dimensions approaching the size of small ions and water molecules. We report ion transport through ultimately narrow slits that are fabricated by effectively removing a single atomic plane from a bulk crystal. The atomically flat angstrom-scale slits exhibit little surface charge, allowing elucidation of the role of steric effects. We find that ions with hydrated diameters larger than the slit size can still permeate through, albeit with reduced mobility. The confinement also leads to a notable asymmetry between anions and cations of the same diameter. Our results provide a platform for studying the effects of angstrom-scale confinement, which is important for the development of nanofluidics, molecular separation, and other nanoscale technologies.

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Citations

Jan 4, 2019·Nanoscale·Wenwen FeiWanlin Guo
Apr 2, 2019·Physical Chemistry Chemical Physics : PCCP·Belisa R H de AquinoF M Peeters
May 23, 2019·Chemical Society Reviews·Sophie Marbach, Lydéric Bocquet
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Jun 4, 2020·Nature Communications·Bedanga SapkotaMeni Wanunu
Jul 15, 2020·Nature Materials·Alice MarcotteLydéric Bocquet
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