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首页> 外文期刊>RSC Advances >Size-controlled synthesis of water-dispersible superparamagnetic Fe3O4 nanoclusters and their magnetic responsiveness
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Size-controlled synthesis of water-dispersible superparamagnetic Fe3O4 nanoclusters and their magnetic responsiveness

机译：水分散性超顺磁性Fe3O4纳米团簇的尺寸控制合成及其磁响应性

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Highly water dispersible and size-controllable superparamagnetic Fe3O4 nanoclusters were synthesized by a simple solvothermal route with sodium citrate as a surface modifier in a mixed-solvent system with diethylene glycol (DEG) and ethylene glycol (EG). The Fe3O4 nanoclusters are small-molecule grafted and the size of the Fe3O4 nanoclusters can be effectively controlled by varying the volume ratio of DEG/EG from tens to hundreds of nanometers. Sodium citrate did not only act as a functional ligand anchor on the particle surface to enhance the dispersibility of the magnetite nanoclusters but also controlled the size of the clusters in the reaction. Magnetic measurements revealed the superparamagnetic nature of the magnetic nanoclusters with no coercivity and remanence but with a magnetization saturation of up to 68.0 emu g(-1) at room temperature. These monodisperse Fe3O4 nanoclusters can be used for color display and hyperthermia in biomedical applications because of strong magnetic responsiveness. The diffraction color in the visible light can be modulated under the induction of varied external magnetic fields. Furthermore, the temperature of 20 mg mL(-1) Fe3O4 (168 nm) water dispersions can be increased by 46.7 degrees C within 242 s under an alternating current magnetic field.
机译：在二甘醇（DEG）和乙二醇（EG）的混合溶剂体系中，以柠檬酸钠为表面改性剂，通过简单的溶剂热途径合成了高度水分散性和尺寸可控的超顺磁性Fe3O4纳米团簇。 Fe3O4纳米团簇是小分子接枝的，并且可以通过将DEG / EG的体积比从数十纳米更改为数百纳米来有效地控制Fe3O4纳米团簇的大小。柠檬酸钠不仅充当颗粒表面上的功能性配体锚，以增强磁铁矿纳米团簇的分散性，而且还控制了反应中簇的大小。磁性测量揭示了磁性纳米团簇的超顺磁性，没有矫顽力和剩磁，但在室温下的磁化饱和度高达68.0 emu g（-1）。这些单分散的Fe3O4纳米团簇具有强大的磁响应性，可用于生物医学应用中的彩色显示和热疗。可见光中的衍射色可以在变化的外部磁场的感应下进行调制。此外，在交流磁场下，可以在242 s内将20 mg mL（-1）Fe3O4（168 nm）水分散体的温度提高46.7摄氏度。

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