PROCESS FOR PRODUCING MAGNETIC NANOCOMPOSITES BASED ON IRON OXIDE

Example with one sample : cubic particles and presence of nanotubes (the second phase)

 

There are a multitude of methods for producing magnetic nanoparticles with a given magnetic behavior (paramagnetic, ferromagnetic, etc.) and a given magnetic category (soft, semi-hard, hard). But for the same composition of precursors and a given process, there is still no simple and effective way to modulate the magnetic category. Based on coprecipitation of precursors and a hydrothermal and/or solvothermal synthesis, this innovative production process allows to easily choose the magnetic category (soft, semi-hard, hard) of the nanocomposites while using the same composition of precursors.

 

Applications

  • Ferrofluids, magneto-rhéological fluids
  • Electromagnetic shielding
  • Water/soil traitement
  • Catalysis
  • Energy storage
  • Therapeutics and diagnosis
  • Antibacterial activity

 

Competitive advantages

  • Possible to obtain different magnetic materials (soft, semi-hard, and hard) while using the same composition
  • The coercive field is adjustable according to the synthesis conditions.
  • High purity (only presence of Co, Fe, Pr, and O based on an EDX analysis by MET)
  • Large range of particle size possible : from 1nm to 500nm or more
  • High Specific Surface Area (250-750 m²/g with 5nm nanospheres, depending on the particles shape)
  • Low bulk density (< 5 g/cm3)
  • No theoretical limit for the injection of these NPs into another material (just below a certain temperature to avoid loss of the secondary phases)

 

Intellectual property

Patented technology

 

Keywords

Nanoparticles - Ferrites - Solvothermal - Hydrothermal - Magnetic

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