Chitosan-Coated Fe₃O₄ Nanoparticles for Magnetic Hyperthermia

Area of Science:

• Materials Science
• Biophysics
• Nanotechnology

Background:

• Ferrofluids containing iron oxide nanoparticles are promising for magnetic hyperthermia cancer therapy.
• Understanding their electrical, dielectric, and magnetic properties is key to optimizing thermal energy delivery.
• Chitosan composites offer tunable properties for biomedical applications.

Purpose of the Study:

• To investigate the electrical, dielectric, and magnetic properties of Fe3O4 ferrofluids and chitosan composites.
• To correlate these properties with their performance in magnetic hyperthermia.
• To assess the impact of chitosan coating on nanoparticle characteristics and specific absorption rate (SAR).

Main Methods:

• Synthesis of Fe3O4 nanoparticles via coprecipitation.
• Characterization using impedance spectroscopy, X-ray diffraction, microscopy, Mössbauer spectroscopy, and calorimetry.
• Evaluation of ferrofluid properties (conductivity, permittivity) and SAR under varying conditions.

Main Results:

• Chitosan coating altered Fe3O4 textural properties, reducing specific surface area.
• Electrical conductivity was frequency- and temperature-dependent, showing both metallic and dielectric behavior.
• Specific absorption rate (SAR) ranged from 11.4 to 23.4 W/g, with chitosan reducing SAR by 12-40%.

Conclusions:

• Electrical and dielectric parameters significantly influence the thermal capabilities of ferrofluids for magnetic hyperthermia.
• Chitosan coating affects SAR, necessitating careful consideration for treatment optimization.
• Results are vital for refining bio-heat models in magnetic hyperthermia therapy.