Monodispersed and water-soluble TbF3 nanoparticles were synthesized at a relatively low temperature in aqueous solution using citric acid as an additive,and characterized by X-ray diffraction（XRD）,field emission sca...Monodispersed and water-soluble TbF3 nanoparticles were synthesized at a relatively low temperature in aqueous solution using citric acid as an additive,and characterized by X-ray diffraction（XRD）,field emission scanning electron microscopy（FE-SEM）,Fourier transform infrared spectra（FTIR）,photoluminescence（PL） spectra and lifetime.The as-prepared TbF3 nanoparticles had orthorhombic structure and were composed of monodispersed spherical particles with an average particle size of 50 nm.The excitation spectrum of TbF3 nanoparticles obtained by monitoring the emission of Tb3＋ at 543 nm was composed of the characteristics f-f transition lines within the Tb3＋ 4f8 configuration.Under the UV light irradiation,the emission spectrum exhibited four obvious lines centered at 489,543,589,and 618 nm,which was corresponding to the 5D4→7FJ（J=6,5,4,3） transitions of the Tb3＋ ions in TbF3 nanoparticles.展开更多
Considering the development of magnetic resonance imaging （MRI） under ultrahigh magnetic field （〉3 T）, the exploration of novel contrast agents （CAs） for ultrahigh field MRI is urgently needed. Herein, we repor...Considering the development of magnetic resonance imaging （MRI） under ultrahigh magnetic field （〉3 T）, the exploration of novel contrast agents （CAs） for ultrahigh field MRI is urgently needed. Herein, we report polyethyleneimine （PEI）-coated TbF3 nanoparticles （NPs）, which were synthesized by a facile solvothermal method, as potential dual-mode CAs for ultrahigh field MRI and X-ray computed tomography （CT）. Owing to their strong paramagnetism, the TbF3 NPs showed excellent transverse relaxivity （395.77 mM-l.s-1） and negligible longitudinal relaxivity under an ultrahigh magnetic field （7 T） with a great potential as a T2-weighted MRI contrast agent. Furthermore, by comparison with the clinically used CT CAs （iohexol）, the TbF3 NPs showed superior X-ray attenuation ability. The practical application for T2-weighted MRI and CT imaging was demonstrated with an animal model. Moreover, cell cytotoxicity and in vivo toxicity assessments implied the low toxicity of TbF3 NPs. In summary the above results indicate that TbF3 NPs are promising candidates for ultrahigh field MRI and CT dual-mode imaging.展开更多
基金Project supported by the National Natural Science Foundation of China (21171179)Henan Educational Committee (2011B140025)+3 种基金University Key Teacher of Henan Province (2009GGJS-119)HASTIT (2011HASTIT030)the State Key Laboratory Program of Rare Earth Resource UtilizationStartup Fund for Doctoral Program of Zhoukou Normal University
文摘Monodispersed and water-soluble TbF3 nanoparticles were synthesized at a relatively low temperature in aqueous solution using citric acid as an additive,and characterized by X-ray diffraction（XRD）,field emission scanning electron microscopy（FE-SEM）,Fourier transform infrared spectra（FTIR）,photoluminescence（PL） spectra and lifetime.The as-prepared TbF3 nanoparticles had orthorhombic structure and were composed of monodispersed spherical particles with an average particle size of 50 nm.The excitation spectrum of TbF3 nanoparticles obtained by monitoring the emission of Tb3＋ at 543 nm was composed of the characteristics f-f transition lines within the Tb3＋ 4f8 configuration.Under the UV light irradiation,the emission spectrum exhibited four obvious lines centered at 489,543,589,and 618 nm,which was corresponding to the 5D4→7FJ（J=6,5,4,3） transitions of the Tb3＋ ions in TbF3 nanoparticles.
基金This work was supported by the National Natural Science Foundation of China （No. 21425101, 21371011, and 21321001） and the National Basic Research Program of China （No. 2014CB643800）.
文摘Considering the development of magnetic resonance imaging （MRI） under ultrahigh magnetic field （〉3 T）, the exploration of novel contrast agents （CAs） for ultrahigh field MRI is urgently needed. Herein, we report polyethyleneimine （PEI）-coated TbF3 nanoparticles （NPs）, which were synthesized by a facile solvothermal method, as potential dual-mode CAs for ultrahigh field MRI and X-ray computed tomography （CT）. Owing to their strong paramagnetism, the TbF3 NPs showed excellent transverse relaxivity （395.77 mM-l.s-1） and negligible longitudinal relaxivity under an ultrahigh magnetic field （7 T） with a great potential as a T2-weighted MRI contrast agent. Furthermore, by comparison with the clinically used CT CAs （iohexol）, the TbF3 NPs showed superior X-ray attenuation ability. The practical application for T2-weighted MRI and CT imaging was demonstrated with an animal model. Moreover, cell cytotoxicity and in vivo toxicity assessments implied the low toxicity of TbF3 NPs. In summary the above results indicate that TbF3 NPs are promising candidates for ultrahigh field MRI and CT dual-mode imaging.
