Fabrication of microfluidic devices: Improvement of surface quality of CO2 laser machined poly(methylmethacrylate) polymer

Mazher I. Mohammed, Muhd Nazrul Hisham Zainal Alam, Abbas Kouzani, Ian Gibson

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)

Abstract

Laser engraving has considerable potential for the rapid and cost effective manufacturing of polymeric microfluidic devices. However, fabricated devices are hindered by relatively large surface roughness in the engraved areas, which can perturb smooth fluidic flow and can damage sensitive biological components. This effect is exacerbated when engraving at depths beyond the laser focal range, limiting the production of large aspect ratio devices such as microbioreactors. This work aims to overcome such manufacturing limitations and to realise more reproducible and defect free microfluidic channels and structures. We present a strategy of multiple engraving passes alongside solvent polymer reflow for shallow depth (<500 μm) and a layer cutting with laminate bonding for larger depth (>500 μm) features. To examine the proposed methodologies, capillary action and bioreactor microfluidic devices were fabricated and evaluated. Results indicate that the multiple engraving technique could reproduce engraved microfluidic channels to depths between 50-470 μm, both rapidly (6-8 min) and with low average surface roughness (1.5-2.5 μm). The layer cutting approach was effective at manufacturing microfluidic devices with depths <500 μm, rapidly (<1 min) and with low surface roughness. Ultimately, the proposed methodology is highly beneficial for the rapid development of polymer-based microfluidic devices.

Original languageEnglish
Article number015021
JournalJournal of micromechanics and microengineering
Volume27
Issue number1
DOIs
Publication statusPublished - Jan 2017
Externally publishedYes

Keywords

  • laser engraving
  • microfluidics
  • PMMA
  • rapid prototyping

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