Magnetic domain orientation in magnetite Fe 3 O 4 nanoparticles coated with natural extracts from Syzygium aromaticum , Illicium verum or Lippia graveolens

Key Points

• The aim is to investigate the magnetic properties of magnetite nanoparticles coated with polyphenol-rich extracts.
• Synthesis of Fe3O4 nanoparticles smaller than 10 nm
• Coating of nanoparticles with extracts from Syzygium aromaticum, Illicium verum, or Lippia graveolens
• Evaluation of superparamagnetic properties and phenol bonding interactions
• The coated nanoparticles demonstrated effective superparamagnetic uniaxial magnetic response
• Polyphenol bonding facilitated Fe–OH interactions on the surface