Temperature effect on the properties of a Fe3O4–mannite–water system

We have studied oxidizability of magnetic Fe3O4 nanoparticles in the solution of the mannitol stabilizer at
temperatures below and above its melting point (166 C) and of unstabilized particles. The addition of
mannitol as stabilizer into a magnetic Fe3O4 fluid shifts the degradation temperature of the fluid upward. It
was shown that at 160 C the protective film created by mannitol prevents nanoparticles from active
oxidation. At temperatures above 240 C, Fe3O4 oxidizes to Fe2O3 and Fe21.34O32 due to melting of mannitol
and its decomposition to mannose and galactose sugars. The results of these studies are interesting and
important for synthesis of general magnetic nanoparticles with a wide range of practical applications and for
processes with heat treatment of mannitol-stabilized magnetite particles.