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Updated: Mar 21, 2026

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Monolithic 3D-printed split-and-recombine micromixer integrated into a microfluidic concentration gradient generator.

Francisco Navarro Molina1, Jitendra Paliwal2, Elham Salimi1

  • 1Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, Manitoba, Canada. elham.salimi@umanitoba.ca.

Lab on a Chip
|March 20, 2026
PubMed
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This study introduces a novel, single-step 3D printed micromixer using stereolithography digital light processing (SLA-DLP). This advanced fabrication method achieves high mixing efficiency for lab-on-a-chip devices, simplifying production.

Area of Science:

  • Microfluidics
  • Additive Manufacturing
  • Biotechnology

Background:

  • Efficient micromixing is crucial for lab-on-a-chip (LOC) devices.
  • Traditional fabrication methods like soft-lithography are complex and limit design flexibility.

Purpose of the Study:

  • To develop a novel, high-performance micromixer using a simplified fabrication process.
  • To demonstrate the integration of this micromixer into a functional microfluidic device.

Main Methods:

  • Fabrication of a monolithic split-and-recombine (SAR) micromixer using stereolithography digital light processing (SLA-DLP) in a single step.
  • Computational fluid dynamics (CFD) simulations and experimental validation to assess mixing performance.
  • Integration of the micromixer into a microfluidic concentration gradient generator.

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Last Updated: Mar 21, 2026

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Main Results:

  • Achieved high mixing efficiencies (>0.90) across a wide range of Reynolds numbers (0.1–100).
  • Demonstrated stable and reproducible concentration profiles using the integrated gradient generator.
  • Fabrication time was under 1.5 hours using a desktop SLA-DLP system, eliminating molds, bonding, and cleanroom processing.

Conclusions:

  • Additive manufacturing, specifically SLA-DLP, offers a rapid, accessible, and digital fabrication route for advanced microfluidic systems.
  • The developed SAR micromixer provides a robust and efficient solution for LOC applications.
  • This approach significantly reduces complexity and production time for microfluidic devices.