3D micro/nano hydrogel structures fabricated by two-photon polymerization for biomedical applications.

Area of Science:

• Biomaterials Science
• Photochemistry
• Biomedical Engineering

Background:

• Hydrogels mimic natural extracellular matrix, making them valuable in biomedicine.
• Photochemistry offers an interesting polymerization strategy for hydrogel fabrication.
• Gelatin-methacryloyl (GelMA) is a key biomaterial precursor due to its biological activity.

Purpose of the Study:

• To develop a novel GelMA-based photoresist formulation.
• To fabricate high-resolution 3D porous structures using two-photon polymerization.
• To investigate the impact of process parameters on 3D structure manufacturing.

Main Methods:

• Utilized two-photon polymerization (TPP) for fabricating 3D structures from a new GelMA photoresist.
• Optimized TPP process parameters including scanning speed, laser power, and layer spacing.
• Conducted in vitro biological tests to assess cytocompatibility.

Main Results:

• Achieved a maximum resolution of less than 120 nm for the fabricated 3D structures.
• Demonstrated successful manufacturing of various 3D structures by adjusting TPP parameters.
• Confirmed the biocompatibility of the 3D hydrogel for MC3T3-E1 cell proliferation.

Conclusions:

• The new GelMA photoresist enables high-resolution 3D fabrication via TPP.
• Optimized process parameters are crucial for precise manufacturing of complex structures.
• The resulting 3D hydrogels are biocompatible and promising for biomedical applications.