Chinese Journal of Applied Chemistry

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Preparation and Characterization of Rare Earth Europium Containing Bifunctional Fluorescent Magnetic Nanoparticles

LI Zheng1, ZHU Haie1, ZHOUYingjie1, YAN Kai1, YI Changfeng1,2, XU Zushun2*   

  1. (1.College of Materials Science and Engineering;2.Ministry-of-Education Key Laboratory for the
    Green Preparation and Application of Functional Materials, Hubei University,Wuhan 430062,China)
  • Received:2013-12-02 Revised:2013-12-24 Published:2014-07-10 Online:2014-07-10

Abstract: Firstly oleic acid and sodium undecylenate modified water-soluble magnetic fluid was prepared. Then in the presence of water-based magnetic fluid, fluorescent magnetic nanoparticles were successfully synthesized by soap-free and seeded emulsion polymerization of rare earth complex monomer Eu(AA)3Phen(AA=acrylic acid, phen=1,10-phenanthroline) polymerized with styrene(St) and glycidyl methacrylate(GMA) using potassium persulfate(KPS) as the initiator. The morphology and size of the products were characterized by transmission electron microscopy(TEM) and dynamic light scattering(DLS) granulometer. Experimental results show that the fluorescent magnetic nanoparticles have obvious core-shell structures. Their particle sizes are smaller than 100 nm and have narrow size distribution. The chemical and crystalline structures of the particles were analyzed by Fourier transform infrared spectroscopy(FTIR) and X-ray diffraction(XRD). The magnetic and fluorescent properties of the particles were characterized by vibrating sample magnetometer(VSM) and fluorescence spectrophotometer. These results show that the fluorescent nanoparticles exhibit the superparamagnetic property. Their fluorescence emission spectra show characteristic emission peaks of Eu3+ at 594 and 619 nm, respectively.

Key words: water-based magnetic fluid, soap-free and seeded emulsion polymerization, rare earth, europium, fluorescent magnetic nanoparticles

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