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Sequential capillarity-assisted particle assembly in a microfluidic channel.

Roberto Pioli1, Miguel Angel Fernandez-Rodriguez, Fabio Grillo

  • 1Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Stefano-Franscini-Platz 5, 8093 Zürich, Switzerland. esecchi@ethz.ch.

Lab on a Chip
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Summary

We developed a microfluidic platform for versatile colloidal patterning using sequential capillarity-assisted particle assembly (sCAPA). This accessible technology enables precise particle placement for applications in microelectronics and sensing.

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Area of Science:

  • Materials Science
  • Microfluidics
  • Nanotechnology

Background:

  • Colloidal patterning is crucial for micro- and nano-electronics, sensing, and plasmonics.
  • Directed colloidal assembly offers high yield and accuracy but requires specialized equipment.
  • Existing methods limit the widespread applicability of colloidal patterning.

Purpose of the Study:

  • To present a novel, accessible microfluidic platform for versatile colloidal patterning.
  • To demonstrate a new method based on sequential capillarity-assisted particle assembly (sCAPA).
  • To enable precise particle placement using readily available microfluidic equipment.

Main Methods:

  • Utilized a microfluidic platform with a microchannel and an array of microfabricated traps.
  • Employed sequential capillarity-assisted particle assembly (sCAPA) driven by controlled droplet evaporation.
  • Leveraged capillary forces for precise deposition of individual colloidal particles.

Main Results:

  • Successfully generated versatile colloidal patterns of single or multiple particle types.
  • Demonstrated that patterns are dictated by trap geometry and filling sequence.
  • Showcased the platform's capability for surface functionalization of trapped particles within the microchannel.

Conclusions:

  • The presented microfluidic platform offers an easy-to-build and implementable solution for colloidal patterning.
  • sCAPA within a microfluidic channel provides a controlled environment for precise particle assembly.
  • This technology expands the accessibility of colloidal patterning for various scientific and technological applications.