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Collective modes and quantum effects in two-dimensional nanofluidic channels.

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We reveal how nanoscale fluid behavior is influenced by collective charge fluctuations in confined spaces. This work offers a new framework for understanding Coulomb interactions in nanofluidic systems.

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Area of Science:

  • Physics
  • Materials Science
  • Physical Chemistry

Background:

  • Nanoscale fluid transport is often studied using atomic-scale dynamics in molecular simulations.
  • Fourier-space analysis, focusing on collective charge fluctuations, has successfully predicted phenomena like quantum friction and near-field heat transfer.
  • Understanding these fluctuations is key to advancing nanofluidics.

Purpose of the Study:

  • To investigate charge fluctuation modes within a two-dimensional nanofluidic channel.
  • To generalize the concept of surface response functions for confined systems.
  • To explore the impact of confinement on fluid and wall dynamics.

Main Methods:

  • Utilized a Fourier-space approach to analyze charge fluctuations.
  • Introduced and applied confined response functions.
  • Modeled a two-dimensional planar nanofluidic channel with varying wall spacing.

Main Results:

  • Confined channel walls exhibit coupled plasmon modes when confinement approaches plasmon wavelengths.
  • Water fluctuations remain bulk-like until wall spacing is reduced to 7 Å.
  • Predicted the dependence of quantum friction and thermal boundary conductance on channel width.

Conclusions:

  • Developed a general framework for Coulomb interactions in nanoscale confined systems.
  • Demonstrated that wall charge fluctuations couple significantly at smaller confinement scales.
  • Highlighted the distinct confinement effects on wall versus fluid dynamics.