Grains size distribution and thermal stability of surfactant stabilized Fe3O4-based magnetic fluid

P. Urban, B. Idzikowski, S. Kostyrya, B. Andrzejewski, Z. Vértesy

Research output: Contribution to journalArticle

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Abstract

The magnetic characterization and determination of the grains size distributions of magnetic particles used for magnetic fluids (MF) preparation were performed. The characterization was done by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), differential scanning calorimetry (DSC) and by magnetic measurements. The investigated MF exhibits higher blocking temperature Tb but lower magnetization value then the pure powder of nanoparticles used for MF preparation without surfactant coating. The mean diameter of Fe3O4 nanoparticles was calculated from Tb (Dm=11.5 nm) and from XRD (Dm=10.1 nm) and compared with particles after their stabilization with lauric acid (D m=12.2 nm). Morphology and grains size distribution were examined by FESEM (mean diameter of the grains D0=16.0 nm). DSC curves show three endothermic peaks at 51°C, 130°C and 222°C: the first one corresponds to melting temperature and the third one to the boiling temperature of the lauric acid. Peak at temperature 130°C is a proof of the existence of surfactant double layers.

Original languageEnglish
JournalCzechoslovak Journal of Physics
Volume54
Issue numberSUPPL. 4
DOIs
Publication statusPublished - Dec 2004

Fingerprint

thermal stability
grain size
surfactants
fluids
field emission
heat measurement
nanoparticles
preparation
acids
scanning electron microscopy
scanning
temperature
diffraction
boiling
magnetic measurement
x rays
stabilization
melting
coatings
magnetization

Keywords

  • Magnetic fluids
  • Small magnetic particles
  • Thermal stability of structure

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Grains size distribution and thermal stability of surfactant stabilized Fe3O4-based magnetic fluid. / Urban, P.; Idzikowski, B.; Kostyrya, S.; Andrzejewski, B.; Vértesy, Z.

In: Czechoslovak Journal of Physics, Vol. 54, No. SUPPL. 4, 12.2004.

Research output: Contribution to journalArticle

Urban, P. ; Idzikowski, B. ; Kostyrya, S. ; Andrzejewski, B. ; Vértesy, Z. / Grains size distribution and thermal stability of surfactant stabilized Fe3O4-based magnetic fluid. In: Czechoslovak Journal of Physics. 2004 ; Vol. 54, No. SUPPL. 4.
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