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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Electroosmotic flow in single PDMS nanochannels.

Ran Peng1, Dongqing Li1

  • 1Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario, CanadaN2L 3G1. dongqing@uwaterloo.ca.

Nanoscale
|June 4, 2016
PubMed
Summary
This summary is machine-generated.

Electroosmotic flow (EOF) in PDMS nanochannels shows size-dependent behavior. Smaller nanochannels with overlapped electric double layers (EDL) exhibit reduced EOF velocity compared to microchannels.

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Area of Science:

  • Nanofluidics
  • Surface Science
  • Electrokinetics

Background:

  • Electroosmotic flow (EOF) is crucial in micro/nanofluidic devices.
  • Understanding EOF in nanochannels is essential for device design.
  • Previous studies often focused on microchannels or larger nanochannels.

Purpose of the Study:

  • To systematically investigate electroosmotic flow (EOF) velocity in polydimethylsiloxane (PDMS) nanochannels.
  • To explore the impact of channel size, ionic concentration, and electric field on EOF.
  • To develop a novel fabrication method for single nanochannels in PDMS.

Main Methods:

  • Fabrication of single nanochannels in PDMS.
  • Systematic investigation using the current slope method.
  • Experimental analysis of EOF velocity under varying conditions.

Main Results:

  • EOF velocity in nanochannels (<20 nm) with overlapped electric double layers (EDL) is proportional to the electric field but lower than in microchannels.
  • EOF velocity in larger nanochannels without EDL overlap is independent of channel size and matches microchannel behavior.
  • In smaller nanochannels with EDL overlap, EOF velocity is influenced by ionic concentration and channel size.

Conclusions:

  • Nanochannel dimensions significantly alter EOF behavior due to EDL overlap.
  • The findings provide valuable data for electrokinetic nanofluidics.
  • The developed fabrication method enables precise nanochannel construction for research.