Composite Magnetic Filaments: From Fabrication to Magnetic Hyperthermia Application

Area of Science:

• Biomaterials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Additive manufacturing of magnetic composites is promising for bone tissue engineering and hyperthermia treatments.
• Developing biocompatible magnetic filaments with tunable properties is crucial for advanced biomedical applications.

Purpose of the Study:

• To synthesize nanocomposite ferromagnetic filaments using polylactic acid (PLA) and magnetite nanoparticles (Fe3O4).
• To fabricate and evaluate bone tissue scaffolds for mechanical properties and magnetic hyperthermia performance.
• To determine the optimal material composition for balancing mechanical integrity and thermal efficiency in magnetic scaffolds.

Main Methods:

• Three PLA types (EasyFil, Tough, Premium) were combined with 10 wt% and 20 wt% Fe3O4 nanoparticles.
• Filaments underwent microstructural analysis.
• Printed dog-bone specimens were tested for tensile strength and elongation at break.
• Cylindrical scaffolds were assessed for magnetic hyperthermia performance via specific absorption rate (SAR).

Main Results:

• Tensile strength decreased with increasing Fe3O4 content, notably in EasyFil PLA (-38%).
• Elongation at break also reduced across all composites.
• Scaffolds with 20 wt% Fe3O4 achieved SAR values of 2-7.5 W/g, varying by polymer type.
• Tough PLA composites showed promising heating performance without significant strength compromise.

Conclusions:

• Material selection is key to balancing mechanical properties and thermal efficiency in magnetic scaffolds.
• Tough PLA-based magnetic composites demonstrate significant potential for bone tissue engineering and magnetic hyperthermia therapies.
• These findings provide insights for designing optimized magnetic scaffolds for regenerative medicine and thermal therapies.