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Embedded Ink Writing (EIW) of Polysiloxane Inks.

Rahul Karyappa1, Terry Ching2, Michinao Hashimoto1,2

  • 1Digital Manufacturing and Design Centre, Singapore University of Technology and Design, 8, Somapah Road, Singapore 487372.

ACS Applied Materials & Interfaces
|April 23, 2020
PubMed
Summary

Researchers developed embedded ink writing (EIW) to pattern liquid polysiloxane resins for microfluidic devices. This method uses an immiscible liquid to support structures during printing and curing, enabling precise microstructure fabrication.

Keywords:
2D patterningcontact angledirect ink writing (DIW)embedding mediapolysiloxane

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Area of Science:

  • Materials Science
  • Microfabrication
  • Polymer Chemistry

Background:

  • Polysiloxane is crucial for microfluidics, lab-on-a-chip, and MEMS.
  • Direct patterning of liquid polysiloxane requires specific rheological and chemical properties.
  • Existing methods may alter inherent resin properties.

Purpose of the Study:

  • To develop a simple method for fabricating polysiloxane microstructures without altering resin properties.
  • To enable direct patterning of liquid polysiloxane resins for advanced applications.
  • To investigate the parameters influencing microstructure fidelity.

Main Methods:

  • Utilized a direct ink writing (DIW) printer to dispense liquid polysiloxane resins.
  • Employed an immiscible liquid (methanol, ethanol, isopropanol) to support printed structures.
  • Investigated the effects of curing time and nozzle speed on filament width.
  • Termed the novel technique 'embedded ink writing' (EIW).

Main Results:

  • Achieved increased contact angles (20° to 100°) of polysiloxane in immiscible liquids, stabilizing structures.
  • Successfully fabricated planar microstructures from unmodified liquid polysiloxane resins.
  • Determined the minimum printed filament width of 65 μm.
  • Demonstrated efficient removal of the embedding liquid via evaporation.

Conclusions:

  • Embedded ink writing (EIW) is a viable method for direct patterning of polysiloxane microstructures.
  • EIW preserves the intrinsic properties of liquid polysiloxane resins.
  • The technique holds promise for fabricating microfluidic devices, flexible wearables, and soft actuators.