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Discontinuous Transition in Electrolyte Flow through Charge-Patterned Nanochannels.

Tine Curk1, Sergi G Leyva2,3, Ignacio Pagonabarraga2,3

  • 1Department of Materials Science and Engineering, <a href="https://ror.org/00za53h95">Johns Hopkins University</a>, Baltimore, Maryland 21218, USA.

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PubMed
Summary
This summary is machine-generated.

We discovered two distinct electrolyte flow regimes in patterned nanochannels. A digital on-off flux response emerges, crucial for nanofluidics and ionotronics.

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Area of Science:

  • Nanofluidics
  • Electrokinetics
  • Computational Physics

Background:

  • Understanding electrolyte flow in nanochannels is key for developing advanced devices.
  • Surface charge patterns significantly influence fluid behavior at the nanoscale.

Purpose of the Study:

  • To investigate electrohydrodynamic coupling in patterned nanochannels.
  • To identify conditions for distinct flow regimes and flux control.

Main Methods:

  • Lattice Boltzmann method
  • Dissipative Particle Dynamics (DPD)
  • Analytical theory

Main Results:

  • Identified two distinct flow regimes: slow ionic and fast Poiseuille flow.
  • Observed a discontinuous transition between flow regimes.
  • Transition is sensitive to ion concentration, channel width, and electrostatic coupling.

Conclusions:

  • Electrohydrodynamic coupling enables tunable flow control in nanochannels.
  • Findings suggest routes for designing nanochannels with digital on-off flux responses.
  • Potential applications in nanofluidics and ionotronics.