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Polyelectrolyte adsorption in single small nanochannel by layer-by-layer method.

Jun Li1, Dongqing Li1

  • 1Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.

Journal of Colloid and Interface Science
|December 9, 2019
PubMed
Summary

Controlling nanochannel size with layer-by-layer polyelectrolyte deposition is possible. Layer thickness and saturation depend on salt concentration, affecting electroosmotic flow in nanochannels.

Keywords:
Layer-by-layerNanochannelNanoscale controlPolyelectrolyte adsorption

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • Controlling nanochannel dimensions is crucial for microfluidic devices.
  • Layer-by-layer (LBL) deposition is a common technique for surface modification.
  • Understanding LBL behavior within confined nanochannels is essential.

Purpose of the Study:

  • To experimentally investigate nanochannel size control using LBL polyelectrolyte deposition.
  • To analyze the impact of deposition layers and salt concentration on nanochannel dimensions.
  • To study the resulting changes in electroosmotic flow (EOF) velocity.

Main Methods:

  • Utilizing single hard Polydimethylsiloxane (PDMS) nanochannels.
  • Employing layer-by-layer (LBL) deposition of polyelectrolytes.
  • Measuring electroosmotic flow (EOF) velocity via the current-slope method.

Main Results:

  • Nanochannel size decreases with increasing LBL layers, reaching a saturation point.
  • Layer growth in nanochannels differs significantly from flat substrates.
  • Salt concentration critically influences layer thickness, saturation value, and EOF reversal.
  • EOF velocity decreases with increasing deposition cycles.

Conclusions:

  • LBL deposition offers a method for nanochannel size modulation.
  • Salt concentration plays a dual role in LBL deposition within nanochannels.
  • The study provides insights into nanoscale confinement effects on thin film growth and fluid dynamics.