含稀土铕双功能荧光磁性纳米粒子的制备及性能表征

doi:10.3724/SP.J.1095.2014.30607

摘要/Abstract

摘要： 首先制备了油酸和十一烯酸钠改性的水基磁流体，然后在其存在的情况下，将可聚合的稀土铕配合物单体Eu(AA)3Phen(AA=丙烯酸,phen=邻菲罗啉)与苯乙烯和甲基丙烯酸缩水甘油酯在过硫酸钾的引发下，进行无皂种子乳液聚合来制备荧光磁性高分子微球。利用透射电子显微镜和动态光散射粒度仪表征了粒子的形貌及粒径，发现荧光磁性微球具有明显的核-壳结构及较窄的粒径分布；通过红外光谱和X射线衍射分析表征了粒子的化学及晶体结构；通过振动样品磁强计和荧光分光光度计表征粒子的磁性及荧光性能，发现荧光磁性微球具有超顺磁性，其荧光发射光谱在594和619 nm处出现Eu3+的特征荧光发射峰。

关键词: 水基磁流体, 无皂乳液聚合, 稀土, 铕, 荧光磁性微球

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

中图分类号:

O631

李峥, 朱海娥, 周英杰, 闫凯, 易昌凤, 徐祖顺. 含稀土铕双功能荧光磁性纳米粒子的制备及性能表征[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.30607.

LI Zheng1, ZHU Haie1, ZHOUYingjie1, YAN Kai1, YI Changfeng1,2, XU Zushun2*. Preparation and Characterization of Rare Earth Europium Containing Bifunctional Fluorescent Magnetic Nanoparticles[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30607.

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