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Immersion Phase Separation 3-Dimensional Printing for Strain-Stiffening Hydrogel Scaffolds
Muyuan Chai1,2,3, Haolin Bu2,3, Rui Zheng2,3
1Dongguan Key Laboratory of Smart Biomaterials and Regenerative Medicine, The Tenth Affiliated Hospital, Southern Medical University, Dongguan 523059, P. R. China.
Research (Washington, D.C.)
|June 18, 2025
Summary
Immersion phase separation (IPS) 3D printing creates advanced strain-stiffening hydrogels with complex structures and tunable properties. This technique enables biomimetic scaffolds for regenerative medicine and soft robotics.
Area of Science:
- Biomaterials Science
- 3D Printing Technologies
- Tissue Engineering
Background:
- Strain-stiffening hydrogels mimic biological tissues but face challenges in fabricating complex, mechanoresponsive structures.
- Traditional methods struggle to balance structural intricacy with inherent material behavior.
Purpose of the Study:
- Introduce immersion phase separation (IPS) 3D printing for fabricating strain-stiffening hydrogel scaffolds.
- Enable one-step fabrication of intricate, hierarchical architectures with controlled mechanoresponsive properties.
Main Methods:
- Utilize dynamic hydrophobic interactions and solvent exchange kinetics for controlled fabrication.
- Achieve multiscale control over pore architectures (5-200 μm) and anisotropic microchannels.
- Leverage physically cross-linked networks for recyclability and functional filler integration.
Main Results:
- Preserved J-shaped stress-strain curves characteristic of strain-stiffening behavior.
- Demonstrated multiscale pore architecture control and anisotropic microchannels.
- Achieved high material recyclability (>95%) and enhanced properties (e.g., electrical conductivity) with functional fillers.
Conclusions:
- IPS 3D printing resolves the trade-off between structural complexity and biomimicry in hydrogels.
- This platform facilitates patient-specific implants and adaptive biohybrid devices.
- Establishes a new paradigm for replicating dynamic biological tissue behavior for biomedical applications.
