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Polycarbonate Heat Molding for Soft Lithography.

Utku M Sonmez1, Stephen Coyle1, Rebecca E Taylor1

  • 1Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|April 1, 2020
PubMed
Summary

This study introduces a new method to create multiple rigid molds from a single master mold, overcoming limitations of traditional soft lithography. This scalable microfabrication technique simplifies the production of microfluidic devices and other microsystems.

Keywords:
3D printingheat moldingmicrofabricationmicromillingsoft lithography

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Area of Science:

  • Materials Science
  • Microfabrication
  • Nanotechnology

Background:

  • Soft lithography is a common microfabrication technique using elastomer molds.
  • Traditional master molds are expensive, difficult to produce, and have a limited lifespan.
  • Existing methods face challenges in scalability and cost-effectiveness for mass production.

Purpose of the Study:

  • To develop a novel method for replicating master molds into monolithic thermoplastic sheets.
  • To enable high-throughput, cost-effective fabrication of rigid molds for soft lithography.
  • To overcome the limitations of traditional master mold production and enhance microfabrication scalability.

Main Methods:

  • Replication molding of master molds into monolithic thermoplastic sheets.
  • Utilizing master molds fabricated via photolithography, mechanical micromilling, and 3D printing.
  • Characterizing copying fidelity and functional testing of fabricated microfluidic devices.

Main Results:

  • Successfully replicated microstructures with submicron features and high aspect ratios.
  • Demonstrated high copying fidelity and functional microfluidic devices.
  • Combined up to 19 unique geometries into a single monolithic mold in one step, showcasing scalability.

Conclusions:

  • The developed technique offers a simple, scalable, and cost-effective approach for rigid monolithic mold fabrication.
  • This method can be performed outside cleanroom environments, reducing equipment needs.
  • The technique is suitable for applications in analytical chemistry, biomedical research, and microelectromechanical systems (MEMS).