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Highly Strong and Transparent Hydrogel Elastomers Microfabricated for 3D Microphysiological Systems.

Wenxiu Li1,2, Lianxin Li3, Huimin He1,2

  • 1Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China.

ACS Applied Materials & Interfaces
|July 10, 2025
PubMed
Summary

Researchers developed strong, transparent 3D microarchitected hydrogels using temperature-controlled physical cross-linking. These advanced hydrogels enable microphysiological systems for improved preclinical studies and biodevice engineering.

Keywords:
mechanical robustnessmicrofabricationmicrophysiological systemspoly(vinyl alcohol) hydrogeltransparency

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Area of Science:

  • Biomaterials Engineering
  • Tissue Engineering
  • Polymer Science

Background:

  • 3D microarchitected hydrogels are crucial for microphysiological systems in preclinical research.
  • Existing hydrogels face limitations in mechanical strength and manufacturability for biodevice engineering, unlike polydimethylsiloxane elastomers.
  • There is a need for advanced hydrogel materials with superior mechanical and fabrication properties.

Purpose of the Study:

  • To develop strong, elastic, and transparent 3D microarchitected hydrogels for biodevice engineering.
  • To overcome the limitations of current hydrogels in mechanical properties and microfabrication.
  • To create novel platforms for advanced microphysiological systems.

Main Methods:

  • Utilized temperature-controlled physical cross-linking of poly(vinyl alcohol) in a dimethyl sulfoxide/water solvent mixture.
  • Incorporated dimethyl sulfoxide to promote extensive physical cross-links via nanosized polymeric crystallites through a single freeze-thaw cycle.
  • Employed simple processing technologies for microfabrication, achieving high resolution patterning (20 μm).

Main Results:

  • Generated highly strong, elastic, and transparent hydrogels with approximately 80% water content.
  • Achieved mechanical properties and optical transparency comparable to or exceeding polydimethylsiloxane.
  • Demonstrated successful microfabrication into complex constructs, including hydrogel microwell arrays for tumor spheroid generation and microchannels lined with endothelial cells.

Conclusions:

  • The developed hydrogels offer superior mechanical and optical properties for biodevice engineering.
  • The facile microfabrication process allows for customization of in vitro models and microphysiological systems.
  • This approach provides innovative avenues for disease modeling, organ-on-a-chip technologies, and personalized medicine.