Abstract
The behavior of ion transport through the sub-nm nanopores on the film is is different from the behavior of bulk behavior. Many intriguing phenomena in ionic transport are the key to the design and fabrication of solid-state nanofluidic devices. However, ion transport through the sub-nm nanopores is not yet clearly understood. We investigate ionic transport of sub-nm nanopore from the perspective of conductance by the method of MD. The results show that the ion concentration polarization phenomenon is heavily dependent on the external electric field and the size constraints of nanopores. At the same time, ion concentration polarization also has a profound effect on ion conductance. These conclusions indicate that ion concentration polarization has an important influence on ion transport, and help a new understanding of the design of nanofluidic devices.
Highlights
Due to many intriguing phenomena in ionic transport,for example,ion selectivity[1,2], ionic field-effect[3], and ionic current rectification[4], design and fabrication of solid-state nanofluidic devices have elicited increasing attention to both the scientific and engineering communities[5,6,7]
Probing the influence of ion concentration polarization on ion conductance is beneficial for a clear understanding of ion transport in subnanopores
Ion concentration polarization layer is investigated with molecular dynamic (MD) simulation
Summary
Due to many intriguing phenomena in ionic transport,for example,ion selectivity[1,2], ionic field-effect[3], and ionic current rectification[4], design and fabrication of solid-state nanofluidic devices have elicited increasing attention to both the scientific and engineering communities[5,6,7]. Many studies have shown that ionic transport in nanoconfinement is mainly controlled by the following factors: (1) geometry, (2) surface charge, (3) chemical composition, (4) wettability, (5) environmental pH, (6) electrolyte concentration gradient, (7) ion mobility, and (8) electric field strength[11]. Factors 1-4 are determined by design and fabrication of nanopore, while factors 5-8 can be tuned in the electrolyte solutions. How to exploit these factors in subtle ways is key to design nanofluidic devices. Ion transport through graphene nanopore is a common and important theme in various applications. Many researchers have studied ion transport through nanopores, using molecular dynamics. Probing the influence of ion concentration polarization on ion conductance is beneficial for a clear understanding of ion transport in subnanopores
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