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A Systematic Approach for Developing 3D High-Quality PDMS Microfluidic Chips Based on Micromilling Technology.

Amin Javidanbardan1,2, Ana M Azevedo1,2, Virginia Chu3

  • 1IBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.

Micromachines
|January 21, 2022
PubMed
Summary
This summary is machine-generated.

Micro-and mesoscale milling offers a cost-effective, cleanroom-free method for fabricating high-quality microfluidic systems. This study presents strategies to minimize surface roughness and enable robust 3D microsystem development using poly(methyl methacrylate) and polydimethylsiloxane.

Keywords:
3D microfluidic structurePDMSPMMAdouble castingmicro/mesoscale millingmicromachining strategiesmicrosystem integrationoptimizationsensor integrationsurface quality

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Microfabrication Technologies

Background:

  • Microfluidic systems are increasingly important but require cost-effective, flexible fabrication.
  • Micro-and mesoscale milling offer potential for rapid, cleanroom-free microfabrication.
  • Limited studies fully establish the benefits of milling for high-quality microsystems.

Purpose of the Study:

  • To define a systematic strategy for high-quality poly(methyl methacrylate) (PMMA) micromilled structures.
  • To demonstrate surface roughness minimization in PMMA microstructures.
  • To introduce strategies for 3D microsystem development via double-casting.

Main Methods:

  • Systematic milling optimization and postprocessing for PMMA structures.
  • Case study on minimizing average surface roughness (Ra) of cuboid columns.
  • Development of a negative PMMA master mold for polydimethylsiloxane (PDMS) double-casting.

Main Results:

  • Achieved significant reduction in average surface roughness (Ra) from 1.68 μm to 0.223 μm.
  • Demonstrated a robust method for creating high-quality PMMA microstructures.
  • Successfully developed 3D microsystems using PDMS double-casting with a PMMA master mold.

Conclusions:

  • The proposed milling and double-casting strategies enable efficient fabrication of high-quality microfluidic structures.
  • The approach offers simple integrability and rapid prototyping for microsystems.
  • This method provides a viable, cost-effective alternative for microfluidic device development.