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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
Source PublicationAPPLIED SURFACE SCIENCE
Volume252Issue:2Pages:494-500
AbstractThe 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.
SubtypeArticle
KeywordAdsorption Dextran Magnetite Magnetic Nanoparticles
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.apsusc.2005.01.027
WOS Subject ExtendedChemistry ; Materials Science ; Physics
WOS KeywordNANOPARTICLES
Indexed BySCI
Language英语
WOS SubjectChemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000232174000029
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10218
Collection中国科学院广州能源研究所
Affiliation1.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
Recommended Citation
GB/T 7714
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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