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Chemically driven fluid transport in long microchannels.

Mingren Shen1, Fangfu Ye1, Rui Liu1

  • 1Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

The Journal of Chemical Physics
|October 27, 2016
PubMed
Summary
This summary is machine-generated.

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Chemical gradients drive fluid flow in microchannels. Periodically varied walls create lateral transport, enabling long-distance fluid movement independent of channel length, useful for microfluidic pumps.

Area of Science:

  • Fluid Dynamics
  • Microfluidics
  • Surface Chemistry

Background:

  • Chemical gradients along surfaces can induce diffusio-osmosis, driving fluid flow at micro- and nano-scales.
  • Understanding fluid transport mechanisms in microchannels is crucial for various scientific and engineering applications.

Purpose of the Study:

  • To investigate fluid transport in microchannels with periodically inhomogeneous boundary walls.
  • To explore the potential of induced chemical gradients for lateral fluid transport.

Main Methods:

  • Mesoscopic simulations were employed to model fluid behavior.
  • Analysis focused on the effects of concentration drops and wall properties on flow.

Main Results:

  • A concentration drop across microchannels with periodically inhomogeneous walls induces lateral fluid transport.

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  • The induced flow is driven by a secondary local chemical gradient parallel to the channel.
  • Flow velocity is dependent on concentration drop and wall characteristics, not channel length.

    • Conclusions:

    • Periodically inhomogeneous walls can facilitate long-distance lateral fluid transport in microchannels.
    • This mechanism offers new insights into fluid transport in natural and engineered systems.
    • The findings are applicable to the design of novel micro- and nanofluidic pumps.