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学科主题: 物理化学
题名: A facile and novel approach to magnetic Fe@SiO2 and FeSi2@SiO2 nanoparticles
作者: Li, Miao1;  Chen, Xiao1;  Guan, Jingchao1;  Wang, Xinkui1;  Wang, Junhu2;  Williams, Christopher T.3;  Liang, Changhai1
通讯作者: CLiang
刊名: JOURNAL OF MATERIALS CHEMISTRY
发表日期: 2012-01-14
DOI: 10.1039/c1jm13720d
卷: 22, 期:2, 页:609-616
收录类别: SCI
文章类型: Article
部门归属: 15
项目归属: 1501
产权排名: 2,5
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Multidisciplinary
摘要: A Facile and Novel Approach to Magnetic Fe@SiO2 and FeSi2@SiO2 Nanoparticles
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: Fe@SiO2 and FeSi2@SiO2 nanoparticles with core@shell structure have successfully been synthesized by direct silane silicification of Fe2O3 nanoparticles. The as-prepared samples were characterized by N-2 physisorption, X-ray diffraction, transmission electron microscopy, temperature programmed reduction of H-2 X-ray photoelectron spectroscopy, Mossbauer spectroscopy, and superconducting quantum interference magnetometry. It was found that the amorphous SiO2 shell was formed to protect the core against oxidation when the reduced Fe2O3 nanoparticles were silicified by silane. When the reduced Fe2O3 nanoparticles were exposed to air, a Fe2O3 layer was formed. The structure of the core changed from cubic Fe to orthorhombic FeSi2 with increasing silicification temperatures from 350 to 550 degrees C, due to the dissolution of Si atoms into the iron lattice. The magnetic characterization showed that all samples have ferromagnetic nature and the saturation magnetization values drastically decreased with increasing silicification temperature. This novel methodology can be applied to synthesis of Co@SiO2 and Ni@SiO2 with core@shell structure. The as-prepared Fe@SiO2 and FeSi2@SiO2 nanoparticles with core@shell structure can find applications in magnetically separable catalysts, biomedicines, and magnetically recording materials.
关键词[WOS]: BETA-FESI2 SINGLE-CRYSTALS ;  SEMICONDUCTING SILICIDES ;  NICKEL-CATALYSTS ;  SURFACE-AREA ;  THIN-FILMS ;  FESI2 ;  IRON ;  XPS ;  NANOCAPSULES ;  NANOWIRES
语种: 英语
WOS记录号: WOS:000299020000046
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115828
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Univ Technol, Sch Chem Engn, Lab Adv Mat & Catalyt Engn, Dalian 116024, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Mossbauer Effect Data Ctr, Dalian 116023, Peoples R China
3.Univ S Carolina, Swearingen Engn Ctr, Dept Chem Engn, Columbia, SC 29208 USA

Recommended Citation:
Li, Miao,Chen, Xiao,Guan, Jingchao,et al. A facile and novel approach to magnetic Fe@SiO2 and FeSi2@SiO2 nanoparticles[J]. JOURNAL OF MATERIALS CHEMISTRY,2012,22(2):609-616.
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