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Magnetic Characterization by Scanning Microscopy of Functionalized Iron Oxide Nanoparticles.

Frederico V Gutierrez1, Anna De Falco2, Elder Yokoyama3

  • 1Department of Physics, Pontifical Catholic University of Rio de Janeiro-PUC-Rio, Rua Marques de São Vicente, Rio de Janeiro 22451-900, RJ, Brazil.

Nanomaterials (Basel, Switzerland)
|September 28, 2021
PubMed
Summary

Magnetite nanoparticles functionalized with Pluronic F-127 surfactant exhibit superparamagnetic behavior. Scanning magnetic microscopy offers a novel method for detailed magnetic characterization of these nanoparticles.

Keywords:
Pluronic F-127co-precipitationmagnetic nanoparticlesscanning magnetic microscope

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Magnetite (Fe3O4) nanoparticles are promising for biomedical applications.
  • Functionalization with Pluronic F-127 surfactant can enhance nanoparticle properties.
  • Accurate magnetic characterization is crucial for understanding nanoparticle behavior.

Purpose of the Study:

  • To systematically investigate the magnetic properties of Fe3O4@Pluronic F-127 nanoparticles.
  • To evaluate an improved magnetic characterization method using scanning magnetic microscopy.
  • To confirm the superparamagnetic behavior and stability of the nanoparticles.

Main Methods:

  • Synthesis of Fe3O4 and Fe3O4@Pluronic F-127 nanoparticles via wet chemical reaction.
  • Generation of 3D magnetic maps using scanning magnetic microscopy for magnetization curves.
  • Raman spectroscopy and transmission electron microscopy for material confirmation and size estimation.

Main Results:

  • Fe3O4 and Fe3O4@Pluronic F-127 nanoparticles demonstrated superparamagnetic behavior.
  • Magnetization curves remained stable over months, indicating no significant oxidation.
  • Scanning magnetic microscopy estimated a magnetic core diameter of approximately 5 nm.
  • Raman spectroscopy confirmed the absence of oxidation in the nanoparticles.

Conclusions:

  • The study validates scanning magnetic microscopy as a powerful tool for nanoparticle magnetic characterization.
  • Fe3O4@Pluronic F-127 nanoparticles show stable superparamagnetic properties suitable for biomedical applications.
  • The developed method provides detailed insights into nanoparticle magnetic behavior and core size.