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Phosphoramide Hydrogels as Biodegradable Matrices for Inkjet Printing and Their Nano-Hydroxyapatite Composites.

Mahsa Mostofizadeh1,2, Michael Kainz3, Farzaneh Alihosseini1

  • 1Department of Textile Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.

ACS Applied Materials & Interfaces
|September 19, 2024
PubMed
Summary

Researchers developed novel, biodegradable hydrogel inks for inkjet printing hydroxyapatite (HA) composites. These inks enable precise 3D bioprinting of bone tissue engineering scaffolds, overcoming previous material limitations.

Keywords:
additive manufacturinginkjet printingnano-hydroxyapatitephosphoramidetissue engineering

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Additive Manufacturing

Background:

  • Inkjet printing is a key technology for 3D biomaterial fabrication, enabling precise deposition.
  • Hydroxyapatite (HA) is crucial for bone tissue engineering, but HA-laden inks often lack printability.
  • Existing methods struggle to create suitable HA composite inks for advanced bioprinting applications.

Purpose of the Study:

  • To develop photocurable and biodegradable hydrogel inks for inkjet printing of hydroxyapatite (HA) composites.
  • To overcome the limitations of current HA-laden inks for precise 3D bioprinting.
  • To create inks suitable for piezoelectric inkjet printing of bone tissue engineering scaffolds.

Main Methods:

  • Developed phosphoramide-based hydrogels with thiol-functionalized polyethylene glycol via click chemistry.
  • Tuned ink rheological properties through chemical design for piezoelectric inkjet printing.
  • Demonstrated printability using simple geometric patterns with nanohydroxyapatite composite inks.

Main Results:

  • Successfully created photocurable and biodegradable hydrogel inks containing nanohydroxyapatite.
  • Achieved finely tuned rheological properties suitable for piezoelectric inkjet printing.
  • Demonstrated the precise printability of these composite inks for fabricating 3D structures.

Conclusions:

  • The developed hydrogel inks offer a versatile and efficient solution for precise inkjet printing of biomaterial composites.
  • These inks are suitable for creating scaffolds for bone tissue engineering applications.
  • The biodegradable nature of the hydrogels, degrading into natural bone components (phosphates), enhances their biomedical relevance.