Dynamics of two-dimensional water flow in angstrom-scale mono and hybrid channels

CZ Sun and QY Wang and M Neek-Amal and RF Zhou and BF Bai, PHYSICAL REVIEW FLUIDS, 9, 124201 (2024).

DOI: 10.1103/PhysRevFluids.9.124201

We investigate the dynamics of two-dimensional (2D) water flow within angstrom- scale channels (ASCs), a domain scarcely explored in nanofluidics. Our study focuses on the transformation of monolayer water through hybrid channels made of graphene and MoS2, as well as channels where both walls are made of either graphene or MoS2, with sizes ranging from 6 to 8 & Aring;. We find that the transport of monolayer water through ASCs is significantly hindered under low-pressure conditions at nanoscale timescales. To comprehensively explore the flow dynamics, we introduce a refined extension of the Hagen-Poiseuille equation that accounts for frictional slippage dynamics. Our results indicate that hybrid channels exhibit lower flux compared to monochannels. These findings provide valuable insights into the 2D flow mechanisms of monolayer water molecules, highlighting their distinctive interactions with channel walls and unique structural properties.

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