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Article Dans Une Revue Nature Année : 2019

Molecular streaming and its voltage control in ångström-scale channels

Résumé

The field of nanofluidics has shown considerable progress over the past decade thanks to key instrumental advances, leading to the discovery of a number of exotic transport phenomena for fluids and ions under extreme confinement. Recently, van der Waals assembly of 2D materials 1 allowed fabrication of artificial channels with ångström-scale precision 2. This ultimate confinement to the true molecular scale revealed unforeseen behaviour for both mass 2 and ionic 3 transport. In this work, we explore pressure-driven streaming in such molecular-size slits and report a new electro-hydrodynamic effect under coupled pressure and electric force. It takes the form of a transistor-like response of the pressure induced ionic streaming: an applied bias of a fraction of a volt results in an enhancement of the streaming mobility by up to 20 times. The gating effect is observed with both graphite and boron nitride channels but exhibits marked material-dependent features. Our observations are rationalized by a theoretical framework for the flow dynamics, including the frictional interaction of water, ions and the confining surfaces as a key ingredient. The material dependence of the voltage modulation can be traced back to a contrasting molecular friction on graphene and boron nitride. The highly nonlinear transport under molecular-scale confinement offers new routes to actively control molecular and ion transport and design elementary building blocks for artificial ionic machinery, such as ion pumps. Furthermore, it provides a versatile platform to explore electro-mechanical couplings potentially at play in recently discovered mechanosensitive ionic channels 4 .
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Dates et versions

hal-02125601 , version 1 (29-02-2020)

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Timothée Mouterde, A. Keerthi, Anthony Poggioli, S. Dar, A. Siria, et al.. Molecular streaming and its voltage control in ångström-scale channels. Nature, 2019, 567 (7746), pp.87-90. ⟨10.1038/s41586-019-0961-5⟩. ⟨hal-02125601⟩
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