Synthesis and characterization of functionalized silica-coated Fe3O4 superparamagnetic nanocrystals for biological applications
文献类型：期刊论文
| 作者 | He, YP ; Wang, SQ ; Li, CR ; Miao, YM ; Wu, ZY ; Zou, BS |
| 刊名 | JOURNAL OF PHYSICS D-APPLIED PHYSICS
 |
| 出版日期 | 2005 |
| 卷号 | 38期号:9页码:1342 |
| 关键词 | MAGNETITE NANOPARTICLES PARTICLE-SIZE SATURATION CARRIER FILMS LAW |
| ISSN号 | 0022-3727 |
| 通讯作者 | He, YP (reprint author), Chinese Acad Sci, Inst Phys, Nanoscale Phys & Device Lab, Beijing 100080, Peoples R China. |
| 中文摘要 | Superparamagnetic Fe3O4 nanocrystals were prepared by a chemical coprecipitation method with a thin thickness-adjustable silica layer coated on the surface by hydrolysis of tetraethyl orthosilicate. The silica-coated Fe3O4 nanocrystals were well dispersed and consisted of a 6-7 nm diameter magnetic core and a silica shell about 2 nm thick, according to transmission electron microscopy observations. Fourier transform infrared spectra revealed that amino (-NH2) groups were successfully covalently bonded to the silica-coated Fe3O4 and then carboxyl (-COOH) groups were functionalized to the surface through the reaction of -NH2 and glutaric anhydride. The synthesized nanocrystals have a cubic spinel structure as characterized by x-ray diffraction, electron diffraction and high-resolution transmission electron microscopy. Their magnetic properties were carefully investigated by a SQUID magnetometer. The results showed that the nanocrystals were superparamagnetic and the blocking temperature TB shifted from 131 K down to 92 K after they were coated with a thin nonmagnetic layer, since this layer can effectively suppress the magnetic dipolar interaction between particles; the chemically inert silica layer can limit the outside environment effect on the Fe3O4 cores quite well due to the excellent magnetic reproducibility of the coated nanocrystals after ageing for 7 months at room temperature. In addition, the dependence of their high-field specific magnetization on temperature has a T-2 relationship. These functionalized silica-coated Fe3O4 superparamagnetic nanocrystals have great potential in biomagnetic applications. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/54306]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | He, YP,Wang, SQ,Li, CR,et al. Synthesis and characterization of functionalized silica-coated Fe3O4 superparamagnetic nanocrystals for biological applications[J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS,2005,38(9):1342. |
| APA | He, YP,Wang, SQ,Li, CR,Miao, YM,Wu, ZY,&Zou, BS.(2005).Synthesis and characterization of functionalized silica-coated Fe3O4 superparamagnetic nanocrystals for biological applications.JOURNAL OF PHYSICS D-APPLIED PHYSICS,38(9),1342. |
| MLA | He, YP,et al."Synthesis and characterization of functionalized silica-coated Fe3O4 superparamagnetic nanocrystals for biological applications".JOURNAL OF PHYSICS D-APPLIED PHYSICS 38.9(2005):1342. |
入库方式： OAI收割
来源：物理研究所
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