ArticleJournal of the American Chemical Society2022
Rectified and Salt Concentration Dependent Wetting of Hydrophobic Nanopores.
Article in Journal of the American Chemical Society, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Electrostatic Gating of Ionic Conductance through Heterogeneous van der Waals Nanopores.ACS nano · 2026Article
- Substrate-Tight Graphene Transmembrane-nanofluidic Devices.Small (Weinheim an der Bergstrasse, Germany) · 2026Article
- Heterogeneous Nanopore Arrays - Selective Modification of Nanopores Embedded in a Membrane.Advanced materials (Deerfield Beach, Fla.) · 2025Article
- Effects of Size and Porosity on the Hydrophobicity of Hierarchical Nanoparticles.Nano letters · 2025Article
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6 authors.
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Abstract
Nanopores lined with hydrophobic groups function as switches for water and all dissolved species, such that transport is allowed only when applying a sufficiently high transmembrane pressure difference or voltage. Here we show a hydrophobic nanopore system whose wetting and ability to transport water and ions is rectified and can be controlled with salt concentration. The nanopore we study contains a junction between a hydrophobic zone and a positively charged hydrophilic zone. The nanopore is closed for transport at low salt concentrations and exhibits finite current only when the concentration reaches a threshold value that is dependent on the pore opening diameter, voltage polarity and magnitude, and type of electrolyte. The smallest nanopore studied here had a 4 nm diameter and did not open for transport in any concentration of KCl or KI examined. A 12 nm nanopore was closed for all KCl solutions but conducted current in KI at concentrations above 100 mM for negative voltages and opened for both voltage polarities at 500 mM KI. Nanopores with a hydrophobic/hydrophilic junction can thus function as diodes, such that one can identify a range of salt concentrations where the pores transport water and ions for only one voltage polarity. Molecular dynamics simulations together with continuum models provided a multiscale explanation of the observed phenomena and linked the salt concentration dependence of wetting with an electrowetting model. Results presented are crucial for designing next-generation chemical and ionic separation devices as well as understanding fundamental properties of hydrophobic interfaces under nanoconfinement.
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