Magnetic materials

Because of its special superparamagnetism, magnetic iron oxide particles have broad application prospects in giant magnetic resistance, magnetic liquid and magnetic recording, soft magnetic, permanent magnetic, magnetic cooling, giant magnetic impedance materials, magneto-optical devices, magnetic detectors and so on. Video tape commonly uses acicular iron or iron oxide magnetic ultramicron particles, and nano iron oxide is a new magnetic recording material. Soft ferrite has been widely used in radio communication, radio and television, automatic control, space navigation, radar navigation, measuring instruments, computers, printing, household appliances and biomedical fields.

Field of paint

Iron oxide as a pigment is widely used in high-grade automotive coatings, architectural coatings, anticorrosive coatings, powder coatings, is a better environmental protection coating, the world's iron oxide pigment annual dosage of more than 1 million t, second only to titanium dioxide, inorganic pigments in the second place. With iron oxide as pigment, maintained general inorganic pigment good heat resistance, weather resistance and absorption of ultraviolet and other advantages, and can be well dispersed in the oily carrier, with its modulation of the paint or ink has satisfactory transparency. The use of semiconducting iron oxide coating, due to its high conductive characteristics, can play a role in electrostatic shielding.

Iron oxide is a commonly used colorant in glass production. Glass colored by iron oxide can absorb both ultraviolet and infrared rays, so it is widely used in the manufacture of heat-absorbing glass, sunglasses glass, industrial protective glasses glass and military anti-infrared coatings. At the same time, it has the function of low price, absorption hotline and ultraviolet light.

In addition, a large number of foreign use iron oxide pigment for wood coating colorant and protective agent. Use TRANSPARENT IRON OXIDE PIGMENT TO REPLACE TRADITIONAL PIGMENT TO BE ABLE TO RETAIN THE WOOD GRAIN WITH CLEAR WOOD, AND ITSELF VERY HIGH light resistance SEX MAKES FURNITURE color TO LAST for a long time. Ultraviolet light in sunlight can decompose wood lignin and destroy cell structure, leading to wood aging. Nano-sized iron oxide pigment, due to its small and uniform distribution, will not scatter light and absorb ultraviolet radiation, so it can play a role in protecting wood [5].

catalysis

α-Fe2O3 powder particles have a large specific surface, surface effect is significant, is a good catalyst. Because the iron oxide particles are small, the surface occupies a large volume percentage, the bond and electronic states on the surface are different from the inside of the particles, and the surface atom coordination is different, which leads to the increase of active sites on the surface. The activity and selectivity of the catalyst made of nano α-Fe2O3 particles are higher than those of ordinary catalysts, and the life of the catalyst is long and easy to operate. Nano α-Fe2O3 has been directly used as a catalyst for the oxidation, reduction and synthesis of polymer, when it is used for petroleum refining can make the cracking rate increased 1~5 times, with its solid combustion agent catalyst can make the combustion rate of ordinary combustion agent combustion rate increased 1~10 times, which is very beneficial to the manufacture of high performance rockets and missiles.

Biomedicine and other fields

Nano-sized iron oxide plays an important role in pharmaceutical capsules, drug synthesis, biomedical technology and other fields. α-Fe2O3 is not only used in magnetic materials, pigments, catalysis and biomedical fields, but also has a wide range of application prospects in other fields. For example, nano-sized iron oxide has a good adsorption effect on Cr(Ⅵ), high adsorption efficiency, short adsorption time, and can be recovered and reused, for the treatment of Cr(Ⅵ) in environmental sewage, has certain application value; The gas sensitive material made of nano-α-Fe2O3 has the characteristics of fast response speed, strong selectivity, high sensitivity, good stability and so on. In the preparation of transparent iron oxide, if the arsenic and heavy metal content is strictly controlled, it can be used in food, cosmetics and other industries; Because the transparent iron oxide has transparent coloring, acid and alkali resistance and non-toxic characteristics, can also be used as the coating of the inner wall of the can lid, has a large number of applications in the United States.