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Embedded 3D Printing for Microchannel Fabrication in Epoxy-Based Microfluidic Devices.

Cheng Zhang1, Wenyu Ning1, Ding Nan1

  • 1State Key Laboratory of High-Performance Precision Manufacturing, School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China.

Polymers
|December 17, 2024
PubMed
Summary

Researchers developed a novel fumed silica-epoxy suspension for embedded 3D printing (e-3DP) of microfluidic devices. This material overcomes epoxy

Keywords:
embedded 3D printingepoxyfumed silicamicrofluidic devicesyield-stress fluid

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Biotechnology

Background:

  • Microfluidic devices are crucial for automating biological and chemical processes.
  • Epoxy resins offer desirable properties but suffer from poor 3D printability.
  • Existing fabrication methods for epoxy microfluidics face limitations.

Purpose of the Study:

  • To develop a 3D printable epoxy-based material for microfluidic device fabrication.
  • To enhance the printability of epoxy resin using fumed silica for embedded 3D printing (e-3DP).
  • To characterize the mechanical and rheological properties of the fumed silica-epoxy suspension.

Main Methods:

  • Formulation of epoxy resin suspensions with varying concentrations of fumed silica (3.0%–9.0% w/v).
  • Characterization of rheological properties, including yield stress and thixotropic time.
  • Evaluation of mechanical properties such as compressive modulus and fracture strength.
  • Fabrication of microfluidic devices using the optimized suspension via e-3DP.

Main Results:

  • Increasing fumed silica concentration improved yield stress, compressive modulus, and fracture strength.
  • Higher fumed silica content reduced thixotropic time but decreased transparency.
  • A 6.0% (w/v) fumed silica-epoxy suspension offered a balance of properties for high-fidelity printing.
  • Successful fabrication of two representative microfluidic devices was demonstrated.

Conclusions:

  • Fumed silica effectively transforms epoxy resin into a yield-stress fluid suitable for e-3DP.
  • The developed suspension enables customizable fabrication of epoxy-based microfluidic devices.
  • This approach presents a viable method for producing complex microfluidic structures with enhanced epoxy materials.