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The colloidal stability and core-shell structure of magnetite nanoparticles coated with alginate
Xu, X. Q.; Shen, H.; Xu, J. R.; Xie, M. Q.; Li, X. J.
2006-12-15
发表期刊APPLIED SURFACE SCIENCE
卷号253期号:4页码:2158-2164
摘要The adsorption of alginate (Alg) onto the surface of in water dispersed Fe3O4 nanoparticles and zeta potential of alginate-coated Fe3O4 nanoparticles have been investigated to optimize the colloidal stability of Alg-coated Fe3O4 nanoparticles. The adsorption amount of Alg increased with the decrease of adsorption pH. The zeta potential of Fe3O4 nanoparticles shifted to a lower value after adsorption of Alg. The lower adsorption pH was the lower zeta potential of Fe3O4 nanoparticles became. The Alg-coated Fe3O4 nanoparticles were found to be stabilized by steric and electrostatic repulsions. Those prepared at pH 6 were not stable around pH 5, and those prepared at pH 4 became unstable at pH below 3.5. Alg of M-w 45 kDa was a little bit more adsorbed onto nanoparticles surface than that of Mw 24 kDa. An average Fe3O4 core size of 9.3 +/- 1.7 nm was found by transmission electronic microscopy. An average hydrodynamic diameter of 30-150 nm was measured by photon correlation spectroscopy. However, an average core size of 10 rim and an average hydrodynamic diameter of 38 nm were estimated from the magnetization curve of the concentrated magnetic fluids (MFs). The maximum available saturation magnetization of MFs was about 3.5 kA/m. (c) 2006 Elsevier B.V. All rights reserved.
文章类型Article
关键词Magnetite Nanoparticles Alginate Adsorption Zeta Potential Stability Structure
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1016/j.apsusc.2006.04.015
研究领域[WOS]Chemistry ; Materials Science ; Physics
关键词[WOS]SURFACE ; POLYMER
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:000243244200080
引用统计
被引频次:80[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/344007/10261
专题中国科学院广州能源研究所
作者单位1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
2.Sun Yat Sen Univ, Sch Phys & Engn, Guangzhou 510275, Peoples R China
3.Sun Yat Sen Univ, Sch Chem & Chem Engn, Guangzhou 510275, Peoples R China
4.Sun Yat Sen Univ, Affiliated Hosp 3, Guangzhou 510630, Peoples R China
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Xu, X. Q.,Shen, H.,Xu, J. R.,et al. The colloidal stability and core-shell structure of magnetite nanoparticles coated with alginate[J]. APPLIED SURFACE SCIENCE,2006,253(4):2158-2164.
APA Xu, X. Q.,Shen, H.,Xu, J. R.,Xie, M. Q.,&Li, X. J..(2006).The colloidal stability and core-shell structure of magnetite nanoparticles coated with alginate.APPLIED SURFACE SCIENCE,253(4),2158-2164.
MLA Xu, X. Q.,et al."The colloidal stability and core-shell structure of magnetite nanoparticles coated with alginate".APPLIED SURFACE SCIENCE 253.4(2006):2158-2164.
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