Journal
NANO LETTERS
Volume 23, Issue 10, Pages 4226-4233Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.3c00207
Keywords
nanofluidics; desalination; membranes; interfaces; hydrodynamics
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This research demonstrates the use of molecular dynamics simulations and linear response theory to comprehensively characterize nanofluidic transport. The study reveals the specific molecular interactions that underlie unique phenomena and advantages in nanofluidic systems, including the emergence of electrical current and salt selectivity. The results suggest that nanochannels can function as desalination membranes.
Specific molecular interactions underlie unexpected and useful phenomena in nanofluidic systems, but these require descriptions that go beyond traditional macroscopic hydrodynamics. In this letter, we demonstrate how equilibrium molecular dynamics simulations and linear response theory can be synthesized with hydrodynamics to provide a comprehensive characterization of nanofluidic transport. Specifically, we study the pressure driven flows of ionic solutions in nanochannels comprised of two-dimensional crystalline substrates made from graphite and hexagonal boron nitride. While simple hydrodynamic descriptions do not predict a streaming electrical current or salt selectivity in such simple systems, we observe that both arise due to the intrinsic molecular interactions that act to selectively adsorb ions to the interface in the absence of a net surface charge. Notably, this emergent selectivity indicates that these nanochannels can serve as desalination membranes.
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