Anisometric Iron Oxide-Based Nanoparticles and Sols Based on Them: Preparation and Properties

摘要

We have synthesized magnetic powders of the magnetite-maghemite series by the chemical reaction of the FeSO4 iron salt and the natural arabinogalactan polysaccharide. These particles with a high magnetization value (approximate to 300 Gs) represent a mixture of spherical particles and nanorods. Particles of a spherical shape (diameter of approximate to 5-6 nm) show a superparamagnetic behavior at room temperature, while rods with a diameter of approximate to 5 nm and a length of 30 nm are magnetic. We have prepared sol samples based on the nanoparticle aqueous solution of arabinogalactan. Our results on the magnetism of the circular dichroism (MCD) on sol are consistent with the of Mossbauer spectroscopy data.