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Multi stimuli-responsive hydrogel microfibers containing magnetite nanoparticles prepared using microcapillary

Daeun Lim1, Eunsu Lee, Haneul Kim

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Summary

Researchers created novel stimuli-responsive hydrogel microfibers for tissue engineering. These poly(N-isopropylacrylamide) (PNIPAm) microfibers change shape with temperature and light, offering new possibilities for artificial tissues.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Chemistry

Background:

  • Hydrogel microfibers are crucial for tissue engineering due to their role in vascular structure, nutrient transport, and metabolic/mechanical functions.
  • Stimuli-responsive properties can significantly enhance hydrogel microfiber applications in artificial tissues, but previous research has overlooked this aspect.

Purpose of the Study:

  • To develop novel temperature- and light-responsive hydrogel microfibers for advanced tissue engineering applications.
  • To control the shape and size of poly(N-isopropylacrylamide) (PNIPAm) microfibers using microfluidic techniques.
  • To integrate photothermal nanoparticles for light-induced responsiveness.

Main Methods:

  • Fabrication of poly(N-isopropylacrylamide) (PNIPAm) microfibers via in situ photo-polymerization within calcium alginate templates.
  • Utilized microcapillary devices to control microfiber dimensions (shape and size) by adjusting solution injection and capillary diameter.
  • Incorporated photothermal magnetite nanoparticles (MNPs) into PNIPAm hydrogel microfibers.

Main Results:

  • Successfully prepared PNIPAm hydrogel microfibers with controllable shapes and sizes.
  • Demonstrated that incorporated MNPs generate heat upon visible light absorption, leading to microfiber volume changes.
  • Achieved dual responsiveness: volume changes triggered by both temperature and visible light irradiation.

Conclusions:

  • Developed a method for fabricating stimuli-responsive hydrogel microfibers with tunable properties.
  • The integration of MNPs enables light-triggered responses, expanding the potential of these microfibers in dynamic tissue engineering scaffolds.
  • These findings pave the way for advanced biomaterials with controllable functionalities for regenerative medicine.