Abstract
Abstract Fe3O4 nanoparticles were prepared by chemical co-precipitation, modified with dextran, and dispersed in water to form a magnetic fluid (MF) for use in biomedical areas. The analyses of stability and magnetic property demonstrate that the prepared functional MF possesses outstanding stability (stability index within 60 days, high dilution stability, and autoclaved stability) and high magnetization (the values χ and M s of MF are 5.87 × 10−4 and 20.57 emu/g, respectively). Due to the coating of dextran, the toxicity of MF is minimal (in vitro survival rate of MCF-7 cells, blood compatibility, and in vivo toxicity). In addition, although the outer layer is coated with dextran, the M s intensity remains high, so the Fe3O4 MF owns a fast magnetic temperature response (when the MF concentration is 55 mg/mL, it can rapidly rise to 55°C within 800 s), which plays an extremely vital role in MF hyperthermia. So, the MF can effectively cause necrosis of human lung A549 cells, which shows a certain application potential.
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