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Published on: July 10, 2013
Biocompatible Self-Healing Hydrogel for VAT 3D Printing
Maria D'Aloia1,2,3, Désirée Baruffaldi1,3, Sandra Dirè4
1Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin 10129, Italy.
ACS Materials Au
|May 18, 2026
Summary
This study developed a biocompatible, self-healing hydrogel using digital light processing (DLP) printing for advanced tissue engineering scaffolds. The novel hydrogel demonstrates excellent printability, complex structure fabrication, and robust self-repair capabilities for multiple damage-repair cycles.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- Self-healing hydrogels (SHHs) mimic biological tissues and are ideal scaffolds for cell growth.
- Conventional methods like extrusion printing limit structural complexity and resolution.
- VAT photopolymerization, especially digital light processing (DLP), offers high resolution and design freedom for SHH fabrication.
Purpose of the Study:
- To develop a biocompatible and self-healing hydrogel using DLP 3D printing.
- To enhance structural complexity while maintaining self-repairing properties for tissue engineering.
- To evaluate the printability, self-healing ability, mechanical properties, and cytocompatibility of the developed SHH.
Main Methods:
- Fabrication of hydrogel using polyethylene glycol diacrylate (PEGDA), hydroxyethyl methacrylate (HEMA), dithiothreitol (DTT), and borax in PBS.
- Cross-linking via radical photopolymerization and borate-ester bond formation.
- 3D printing of complex structures using a commercial DLP printer.
- Assessment of self-healing properties, chemical structure (FTIR, NMR), rheology, mechanical performance, and cytocompatibility.
Main Results:
- Successful 3D printing of complex structures with high resolution and design freedom.
- Demonstrated self-healing properties, with samples repairing damage within 72 hours and withstanding multiple damage-repair cycles.
- Confirmed material stability and viscoelastic behavior through chemical and mechanical analyses.
- Preliminary cytocompatibility assays indicated suitability for tissue engineering applications.
Conclusions:
- DLP-based printing facilitates the fabrication of complex self-healing hydrogels with enhanced resolution.
- The developed hydrogel exhibits promising mechanical properties and biocompatibility.
- This SHH is a strong candidate for advanced tissue engineering scaffolds.
