采用共沉淀法合成了粒径为6～10 nm的Fe3O4粒子.借助X射线衍射、红外光谱分析和透射电子显微镜等对其进行了表征.盐酸对纳米Fe3O4分散性的影响通过透射电镜和紫外可见吸收光谱进行表征.结果表明:盐酸对纳米Fe3O4的分散性有很大影响.这种作用机理通过Zeta电位进行验证,表明颗粒的分散性和稳定性随扩散双分子层的厚度而变化,而且,改性后的纳米Fe3O4显示了更好地超顺磁性.
In this paper,monodisperse Fe3O4 nanoparticles with the size of 6-10 nm were synthesized via co-precipitation method.As-synthesized Fe3O4 were characterized by X-ray diffraction (XRD),Fourier transform infrared (FT-IR) spectrometer and transmission electron microscope (TEM).The effect of hydrochloric acid (HC1) amount on products was investigated by TEM and UV-vis absorption spectra.The results indicated that HCl could commendably modulate dispersity of nanometer Fe3O4.A possible generated mechanism of Fe3O4 crystals was proposed in virtue of Zeta potential,it demonstrates that the particles'dispersion and stability changed with the diffusion bilayer.Besides,the magnetic properties of as-synthesized Fe3O4 are detected and the results prove that the modified magnetic nanoparticles exhibit good superparamagnetic property.
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