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Aqueous-based magnetite magnetic fluids stabilized by surface small micelles of oleolysarcosine
Xu, XQ; Shen, H; Xu, JR; Li, XJ
AbstractThe 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.
KeywordN-oleoylsarcosine Nanoparticles Bilayer Adsorption Aqueous-based Magnetic Fluids Stabilization Mechanism
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS Subject ExtendedChemistry ; Materials Science ; Physics
Indexed BySCI
WOS SubjectChemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000187721700055
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Document Type期刊论文
Affiliation1.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
Recommended Citation
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.
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