Surface passivation and characterization of cobalt脙脙脙脙脙脙ferrite nanoparticles
- 作者：Soler ; M.A.G. ; da Silva ; S.W. ; Garg ; V.K. ; Oliveira ; A.C. ; Azevedo ; R.B. ; Pimenta ; A.C.M. ; Lima ; E.C.D. ; et. al.
- 关键词：Cobalt脙脙脙脙脙脙ferrite ; Surface passivation ; Nanoparticle ; M脙脙脙脙ssbauer spectroscopy
- 刊名：Surface Science
- 出版年：2005
- 期刊代码：104_00396028
- 类别：ch
- 出版时间：January 20, 2005
- 卷：575
- 期：1-2
- 页码：12-16
- 文件大小：187 K
摘要
In the present study we report on the chemical synthesis, the surface passivation process, the peptization in low pH aqueous medium, and the characterization of cobalt芒芒芒ferrite nanoparticles. The as produced, passivated and peptized cobalt芒芒芒ferrite nanoparticles were investigated by atomic absorption measurements, transmission electron microscopy, and M芒芒ssbauer spectroscopy. The liquid Helium M芒芒ssbauer spectra consist of three well-defined sextets in all the studied samples. The data are discussed in terms of the characteristics of the nanoparticle surface layer and the effects produced by the passivation and peptization/aging processes.