Cited by 41Microfluidic and Capillary Electrophoresis Applications3D Printing in Biomedical ResearchMicrofluidic and Bio-sensing Technologies

Thermoplastic Elastomer (TPE)–Poly(Methyl Methacrylate) (PMMA) Hybrid Devices for Active Pumping PDMS-Free Organ-on-a-Chip Systems

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Busek, Mathias, Nøvik, Steffen, Aizenshtadt, Aleksandra, Amirola-Martinez, Mikel, Combriat, Thomas, Grünzner, Stefan, Krauss, Stefan·2021·Biosensors

Abstract

Polydimethylsiloxane (PDMS) has been used in microfluidic systems for years, as it can be easily structured and its flexibility makes it easy to integrate actuators including pneumatic pumps. In addition, the good optical properties of the material are well suited for analytical systems. In addition to its positive aspects, PDMS is well known to adsorb small molecules, which limits its usability when it comes to drug testing, e.g., in organ-on-a-chip (OoC) systems. Therefore, alternatives to PDMS are in high demand. In this study, we use thermoplastic elastomer (TPE) films thermally bonded to laser-cut poly(methyl methacrylate) (PMMA) sheets to build up multilayered microfluidic devices with integrated pneumatic micro-pumps. We present a low-cost manufacturing technology based on a conventional CO2 laser cutter for structuring, a spin-coating process for TPE film fabrication, and a thermal bonding process using a pneumatic hot-press. UV treatment with an Excimer lamp prior to bonding drastically improves the bonding process. Optimized bonding parameters were characterized by measuring the burst load upon applying pressure and via profilometer-based measurement of channel deformation. Next, flow and long-term stability of the chip layout were measured using microparticle Image Velocimetry (uPIV). Finally, human endothelial cells were seeded in the microchannels to check biocompatibility and flow-directed cell alignment. The presented device is compatible with a real-time live-cell analysis system.

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  • Thermoplastic materials (polystyrene, PMMA, polycarbonate, COC) are amenable to cheaper and more scalable fabrication and have significantly lower absorption issues, but are limited in oxygen permeability and elastic properties.

    “More recently, developers are increasingly starting to produce their chips from thermoplastic materials, already used in other biotechnological applications: polystyrene (Lee et al., 2018), poly(methyl methacrylate) (Busek et al., 2021), polycarbonate (Wagner et al., 2013), and cyclic olefin copolymer. While being amenable for cheaper and more scalable fabrication processes as well as providing”

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Authors
Busek, M., Nøvik, S., Aizenshtadt, A., Amirola-Martinez, M., Combriat, T., Grünzner, S., & Krauss, S.
Affiliations
  • University of Oslo (NO)
  • Hybrid Technology Hub, Institute of Basic Medical Science, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
  • Technische Universität Dresden (DE)
  • Oslo University Hospital (NO)
Corresponding author
Busek, Mathias
Venue
Biosensors
Publisher
MDPI AG
Published
2021-05-19
Volume
11
Issue
5
Pages
162
ISSN
2079-6374 (ISSN-L)
OpenAlex
W3162141873
Cited by
41
References
47
Citations by year
2026: 8 · 2025: 7 · 2024: 9 · 2023: 6 · 2022: 10 · 2021: 1
FWCI
1.97
Type
journal article
Language
en
Open access
Locations
  • Biosensors (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • NORA - Norwegian Open Research Archives (submittedVersion, other-oa)
Funders
  • Norges Forskningsråd (Centers of Excellence No. 262613)
  • Horizon 2020 Framework Programme (Marie Skłodowska-Curie Actions Grant agreement No 801133 (Scientia fellowship))
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Microfluidic and Capillary Electrophoresis Applications
  • Physical Sciences › Engineering › Biomedical Engineering › 3D Printing in Biomedical Research
  • Physical Sciences › Engineering › Biomedical Engineering › Microfluidic and Bio-sensing Technologies
Keywords
organ-on-a-chip, thermoplastic elastomers, poly(methyl methacrylate), thermal bonding, CO2 laser cutting, spin coating, channel deformation, hydrodynamic stability, human endothelial cells, biocompatibility, live-cell imaging
MeSH terms
Dimethylpolysiloxanes, Humans, Elastomers, Endothelial Cells, Lab-On-A-Chip Devices

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