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Core-shell structure and magnetic properties of magnetite magnetic fluids stabilized with dextran
Xu, XQ; Shen, H; Xu, JR; Xu, J; Li, XJ; Xiong, XM
2005-10-15
发表期刊APPLIED SURFACE SCIENCE
卷号252期号:2页码:494-500
摘要The adsorption process of different dextran molecules onto the surface of in water dispersed magnetite nanoparticles has been investigated to optimize the preparation of magnetite magnetic fluids (MMFs). An average magnetite core size of 7.1 nm was found by X-ray diffraction and that of 8 nm was found by transmission electron microscopy for the samples prepared at 90 degrees C. An average hydrodynamic diameter of 25 nm was observed by scanning electron microscopy and that of 25-300 nm was obtained by photon correlation spectroscopy. The dextran was adsorbed by physical adsorption, a molecular weight of 20 kDa gave the best stability of these MMFs. The shell layer of the particles was weakly negatively charged in buffer solutions of pH values between 5.5 and 9.5. The particles seem to be mainly stabilized by sterical repulsion. The maximum available saturation magnetization of the MMFs was 3.5 kA/m. (c) 2005 Elsevier B.V. All rights reserved.
文章类型Article
关键词Adsorption Dextran Magnetite Magnetic Nanoparticles
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1016/j.apsusc.2005.01.027
研究领域[WOS]Chemistry ; Materials Science ; Physics
关键词[WOS]NANOPARTICLES
收录类别SCI
语种英语
WOS类目Chemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
WOS记录号WOS:000232174000029
引用统计
被引频次:56[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.giec.ac.cn/handle/344007/10218
专题中国科学院广州能源研究所
作者单位1.Sun Yat Sen Univ, Sch Chem & Chem Engn, Guangzhou 510275, Peoples R China
2.Sun Yat Sen Univ, Sch Phys & Engn, Guangzhou 510275, Peoples R China
3.Guangzhou Med Coll, Guangzhou 510182, Peoples R China
4.CAS, Guangzhou Inst Energy Convers, Guangzhou 510070, Peoples R China
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Xu, XQ,Shen, H,Xu, JR,et al. Core-shell structure and magnetic properties of magnetite magnetic fluids stabilized with dextran[J]. APPLIED SURFACE SCIENCE,2005,252(2):494-500.
APA Xu, XQ,Shen, H,Xu, JR,Xu, J,Li, XJ,&Xiong, XM.(2005).Core-shell structure and magnetic properties of magnetite magnetic fluids stabilized with dextran.APPLIED SURFACE SCIENCE,252(2),494-500.
MLA Xu, XQ,et al."Core-shell structure and magnetic properties of magnetite magnetic fluids stabilized with dextran".APPLIED SURFACE SCIENCE 252.2(2005):494-500.
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