A facile and novel approach to magnetic Fe@SiO2 and FeSi2@SiO2 nanoparticles

	A facile and novel approach to magnetic Fe@SiO2 and FeSi2@SiO2 nanoparticles
	Li, Miao 1; Chen, Xiao 1; Guan, Jingchao 1; Wang, Xinkui 1; Wang, Junhu 2; Williams, Christopher T.3; Liang, Changhai 1
刊名	journal of materials chemistry
	2012-01-14
卷号	22 期号:2 页码:609-616
ISSN号	待补充
通讯作者	cliang
产权排序	2,5
中文摘要	a facile and novel approach to magnetic fe@sio2 and fesi2@sio2 nanoparticles
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.
学科主题	物理化学
WOS标题词	science & technology ; physical sciences ; technology
类目[WOS]	chemistry, physical ; materials science, multidisciplinary
研究领域[WOS]	chemistry ; materials science
关键词[WOS]	beta-fesi2 single-crystals ; semiconducting silicides ; nickel-catalysts ; surface-area ; thin-films ; fesi2 ; iron ; xps ; nanocapsules ; nanowires
收录类别	SCI
语种	英语
WOS记录号	WOS:000299020000046
公开日期	2012-07-09
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/115828]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
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
推荐引用方式 GB/T 7714	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.
APA	Li, Miao.,Chen, Xiao.,Guan, Jingchao.,Wang, Xinkui.,Wang, Junhu.,...&Liang, Changhai.(2012).A facile and novel approach to magnetic Fe@SiO2 and FeSi2@SiO2 nanoparticles.journal of materials chemistry,22(2),609-616.
MLA	Li, Miao,et al."A facile and novel approach to magnetic Fe@SiO2 and FeSi2@SiO2 nanoparticles".journal of materials chemistry 22.2(2012):609-616.