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Fluid flow through nanometer-scale channels.

J T Cheng1, N Giordano

  • 1Department of Physics, Purdue University, West Lafayette, Indiana 47907-1396, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 23, 2002
PubMed
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Fluid flow in nanoscale channels shows surprising slip for some liquids. While water behaves as predicted, hexane and oils exhibit wall slip below 100 nm, indicating deviations from classical fluid dynamics.

Area of Science:

  • Fluid dynamics
  • Nanotechnology
  • Surface science

Background:

  • Classical fluid dynamics often assumes no-slip boundary conditions at channel walls.
  • Understanding fluid behavior at the nanoscale is crucial for microfluidic devices and material science.
  • Previous studies have explored nanoscale fluid flow, with varying results depending on fluid and channel properties.

Purpose of the Study:

  • To investigate pressure-driven fluid flow in nanochannels with heights down to 40 nm.
  • To compare experimental flow rates with theoretical predictions based on no-slip boundary conditions.
  • To identify deviations from classical fluid behavior and quantify wall slip in nanoscale channels.

Main Methods:

  • Fabrication of micro/nanochannels using lithography.

Related Experiment Videos

  • Measurement of pressure-driven flow rates for various classical fluids (water, hexane, decane, hexadecane, silicone oil).
  • Comparison of experimental data with theoretical models, including slip length estimation.

    • Main Results:

    • Water flow rates closely matched theoretical predictions down to 40 nm channel height.
    • Hexane, decane, hexadecane, and silicone oil showed increased flow rates (indicating slip) below approximately 100 nm channel height.
    • Estimated slip lengths varied for different fluids, deviating significantly from the no-slip assumption.

    Conclusions:

    • Classical no-slip boundary conditions are valid for water flow in nanochannels as small as 40 nm.
    • For several organic liquids, nanoscale confinement leads to significant wall slip, challenging traditional fluid dynamics models.
    • The findings highlight the importance of considering fluid-specific slip phenomena in micro/nanofluidic applications.