Discontinuous transition in electrolyte flow through charge-patterned nanochannels
arxiv(2024)
摘要
We investigate the flow of an electrolyte through a rigid nanochannel
decorated with a surface charge pattern. Employing lattice Boltzmann and
dissipative particle dynamics methods, as well as analytical theory, we show
that the electro-hydrodynamic coupling leads to two distinct flow regimes. The
accompanying discontinuous transition between slow, ionic, and fast, Poiseuille
flows is observed at intermediate ion concentrations, channel widths, and
electrostatic coupling strengths. These findings indicate routes to design
nanochannels containing a typical aqueous electrolyte that exhibit a digital
on/off flux response, which could be useful for nanofluidics and ionotronic
applications.
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