PROCESS FOR SYNTHESIZING IRON OXIDE POWDER REGULATED SHAPE AND SIZE.

摘要

PURPOSE: Provided are methods for synthesizing iron oxide powder in which the shapes and sizes of particles can be easily regulated. CONSTITUTION: Dried α-FeOOH precursor with final concentration of 0.1-0.5 mol per liter is added to reactor containing glycol solvent such as ethylene glycol, propylene glycol, or mixture of them, which regulators for shape and size of particles, while H2O, itaconic acid, or HNO3 are used as regulators; the mixture is blended by ultrasonic disperser at 150-300°C and with pressure of 3-30 kg per centimeter square for 1-48 hours; then, recrystallized particles are gained by centrifugation. The shape and size of particles are controlled by what kind and what concentration of a regulator is used. Produced iron oxide particles have spherical, octahedral, tetradecahedral, or intermediary polygonal shape and 0.05-5.0 micrometer particle size.