Journal
SCIENCE ADVANCES
Volume 8, Issue 2, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abj2510
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Funding
- National Natural Science Foundation of China [21974123]
- National Key R&D Program of China [2020YFA0211200]
- Natural Science Foundation of Zhejiang Province [LR20B050002]
- Fundamental Research Funds for the Central Universities [2019XZZX003-01]
- Hundreds Program of Zhejiang University
- U.S. National Science Foundation (NSF) [1545907, 1708852, 1720633, 1921578]
- NSF [OCI-1053575, OCI-0725070, ACI-1238993]
- state of Illinois
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1708852] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1921578] Funding Source: National Science Foundation
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This study reports on pressure-modulated ion conduction in graphene nanopores featuring nonlinear electrohydrodynamic coupling. Experimental observations show an increase in ion conduction induced by pressure, which was not predicted by the classical linear coupling model. Computational and theoretical studies reveal that this pressure sensitivity arises from the transport of capacitively accumulated ions near the graphene surface.
Mechanosensitivity is one of the essential functionalities of biological ion channels. Synthesizing an artificial nanofluidic system to mimic such sensations will not only improve our understanding of these fluidic systems but also inspire applications. In contrast to the electrohydrodynamic ion transport in long nanoslits and nanotubes, coupling hydrodynamical and ion transport at the single-atom thickness remains challenging. Here, we report the pressure-modulated ion conduction in graphene nanopores featuring nonlinear electrohydrodynamic coupling. Increase of ionic conductance, ranging from a few percent to 204.5% induced by the pressure-an effect that was not predicted by the classical linear coupling of molecular streaming to voltage-driven ion transport-was observed experimentally. Computational and theoretical studies reveal that the pressure sensitivity of graphene nanopores arises from the transport of capacitively accumulated ions near the graphene surface. Our findings may help understand the electrohydrodynamic ion transport in nanopores and offer a new ion transport controlling methodology.
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