中文摘要：

以聚氧乙烯-聚氧丙烯-聚氧乙烯三嵌段共聚物（PEO—PPO—PEO）作表面活性剂，采用纳米微乳液法还原Fe（Ⅱ）-乙酰丙酮化合物（Fe^Ⅱ（acac）2），制备粒径可控、单分散、水溶性Fe3O4纳米微粒，并进行了相关的表征测试。从傅里叶变换红外光谱（FTIR）中可以看出，共聚物PEO—PPO—PEO包裹在Fe3O4纳米微粒表面；透射电镜（TEM）显示纳米颗粒分散性好，呈球形；高斯拟合表明，不同物料配比合成的Fe3O4粒子大小、粒径分布不同；振动样品磁强计（VSM）测试说明，Fe3O4纳米颗粒室温下为超顺磁性或软铁磁性。由于PEO-PPO—PEO具有亲水性，PEO—PPO—PEO包裹的Fe3O4纳米微粒不用进一步处理即可转移到水相中，在生物和医学领域具有重要的潜在应用价值。

英文摘要：

Size controllable, monodisperse, water-dispersible Fe3O4 nanoparticles were prepared by nanomicroemulsion process using PEO-PPO-PEO as surfaetant, Fe （Ⅱ） acetylacetonate as precursor. Fourier transform infrared spectroscopy （F-FIR） confirmed that the copolymer PEO-PPO-PEO was coated on the surface Fe3O4 nanoparticles. The transmission electron microscopy （TEM） showed that the nanoparticles were monodispersed with spherical shape. Gaussian fitting concluded that the size and dispersion of Fe3O4 nanopartieles could be controlled by the different ratio of materials, the magnetic hysteresis loop by vibrating sample magnetometer showed that Fe3O4 nanopartieles have magnetic effect, or superparamagnetism. The PEO-PPO-PEO was a water soluble eopolymer, could be transferred to the water phase without further surface modification, which has important application value in the field of biology and medicine.