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Tunable Nanofluidic Ionic Transport via Surface Wetting Engineering at Hydrophilic Material-Bubble Interfaces
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DOI：10.1021/acs.jpcc.6c00243.png)
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Abstract
En 中文
Controllable ion transport in nanoconfined systems remains challenging when both geometric confinement and interfacial properties need to be tuned. Here we develop a microfluidic solid-liquid-gas triphase nanofluidic platform in which a stationary microbubble defines an interfacial aqueous nanolayer between the bubble and a solid substrate. Ion transport in this nanolayer evolves from bulk-like conduction to surface-charge-mediated behavior as confinement is strengthened. By varying substrate wettability, electrolyte concentration, and cation valence, we regulate ionic conductance and ion selectivity. Nanolayer thinning drives the emergence of cation-selective transport, whereas graphene oxide interfacial modification further enhances the interfacial effect and approximately doubles the selectivity relative to the hydrophilic glass system. Replacing monovalent-cation electrolytes with divalent-cation electrolytes induces interfacial charge inversion and reverses the preferred transport polarity. These results provide a route to tunable nanofluidic ion transport through the coupled control of confinement and interfacial chemistry.
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SELECTIVITY
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3.2
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5.6W
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