Raman spectroscopy in oleoylsarcosine-coated magnetic fluids: a surface grafting investigation

Author

Morais, P.C. ; da Silva, S.W. ; Soler, M.A.G. ; Buske, N.

Author_Institution

Inst. de Fisica, Brasilia Univ., Brazil

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

3712

Lastpage

3714

Abstract

Raman spectroscopy is used to investigate magnetite nanoparticles pre-coated with oleoylsarcosine and dispersed as stable water-based (WE) and hydrocarbon-based (HE) magnetic fluids (MF´s). The Raman spectra obtained from the MF samples and from liquid water were compared and the data discussed in terms of the suppression of the symmetrical hydroxyl (OH) vibrational modes. The effective grafting coefficient of the oleoylsarcosine in the WB-MF, with respect to the HB-MF, was estimated through the OH-stretching Raman modes of the OH-group chemisorbed at the nanoparticle surface. It was found that the OH-grafting coefficient in the HB-MF sample is about 3 times lower than the grafting coefficient in the WB-MF sample

Keywords

Raman spectra; iron compounds; magnetic fluids; magnetic particles; nanostructured materials; surface chemistry; vibrational modes; Fe₃O₄; OH-stretching Raman modes; Raman spectroscopy; effective grafting coefficient; magnetite nanoparticles; oleoylsarcosine-coated magnetic fluids; surface grafting; vibrational modes; Biological materials; Coatings; Magnetic liquids; Magnetic materials; Molecular biophysics; Nanoparticles; Raman scattering; Spectroscopy; Stability; Surface treatment;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908949

Filename

908949