Aqueous-based magnetite magnetic fluids stabilized by surface small micelles of oleolysarcosine

doi:10.1016/S0169-4332(03)00959-0

GIEC OpenIR > 中国科学院广州能源研究所

	Aqueous-based magnetite magnetic fluids stabilized by surface small micelles of oleolysarcosine
	Xu, XQ ; Shen, H ; Xu, JR ; Li, XJ
	2004-01-15
发表期刊	APPLIED SURFACE SCIENCE
卷号	221 期号:1-4 页码:430-436
摘要	The adsorption of N-oleoylsarcosine onto in water dispersed magnetite nanoparticles were investigated at different concentrations and pH values. The coated nanoparticles surface became hydrophobic at a molar ratio of N-oleoylsarcosine:Fe3O4 below 0.22:1 within a pH range of 5-9.5. Aqueous-based magnetic fluids could not be obtained. A hydrophilic surface was observed at a molar ratio of N-oleoylsarcosine: Fe3O4 above 0.37:1 and at pH levels ranging from 6 to 8.5. Stable aqueous-based magnetic fluids could be prepared. The magnetite particles flocculate at pH levels below 5.5 or above 8.5. The hydrophobic behavior was explained assuming a monolayer adsorption mode. On the other hand, the hydrophilic properties were caused by a bilayer adsorption structure. This hypothesis was in overestimation with results of infrared (IR) spectroscopy and photon correlation spectroscopy of the prepared magnetic fluids. The influences of pH levels on the formation of N-olcoylsarcosine micelles were also discussed to explain the pH-dependant formation of bilayer adsorption structure, i.e. surface small micelle structure. It was indicated that it became difficult for N-oleoylsarcosine adsorb at the water-air interface, or adsorb at the nanoparticles surfaces in the form of surface small micelles at pH levels above 8.5. Besides, the aqueous-based magnetic fluids were also characterized by magnetization curve determinations. (C) 2003 Elsevier B.V. All rights reserved.
文章类型	Article
关键词	N-oleoylsarcosine Nanoparticles Bilayer Adsorption Aqueous-based Magnetic Fluids Stabilization Mechanism
WOS标题词	Science & Technology ; Physical Sciences ; Technology
DOI	10.1016/S0169-4332(03)00959-0
研究领域[WOS]	Chemistry ; Materials Science ; Physics
关键词[WOS]	NANOPARTICLES ; ADSORPTION
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:000187721700055
引用统计	被引频次：26[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/344007/10208
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, Lab Solar Energy, Guangzhou 510070, Peoples R China 2.Zhongshan Univ, Inst Mat, Guangzhou 510275, Peoples R China 3.Zhongshan Univ, Ctr Nanotechnol, Guangzhou 510275, Peoples R China
推荐引用方式 GB/T 7714	Xu, XQ,Shen, H,Xu, JR,et al. Aqueous-based magnetite magnetic fluids stabilized by surface small micelles of oleolysarcosine[J]. APPLIED SURFACE SCIENCE,2004,221(1-4):430-436.
APA	Xu, XQ,Shen, H,Xu, JR,&Li, XJ.(2004).Aqueous-based magnetite magnetic fluids stabilized by surface small micelles of oleolysarcosine.APPLIED SURFACE SCIENCE,221(1-4),430-436.
MLA	Xu, XQ,et al."Aqueous-based magnetite magnetic fluids stabilized by surface small micelles of oleolysarcosine".APPLIED SURFACE SCIENCE 221.1-4(2004):430-436.