In pigments, nano-iron oxide is also called transparent iron oxide (iron penetration). The so-called transparency does not specifically refer to the macroscopic transparency of the particles themselves, but refers to the dispersion of pigment particles in the organic phase to make a layer of paint film (or oil film). When light is irradiated on the paint film, if it does not change the original Through the paint film, the pigment particles are said to be transparent. There are five main varieties of transparent iron oxide, namely red iron, yellow, black, green and brown. The transparent iron oxide pigment has a particle size of 0.01μm, so it has high chroma, high coloring power and high transparency, and has good grinding and dispersibility after special surface treatment. Transparent iron oxide pigments can be used for oiling and alkyd, amino alkyd, acrylic and other paints to make transparent colored paints with good decorative properties. This transparent paint can be used alone or mixed with other organic color pigment pastes. If a small amount of non-floating aluminum powder paste is added, it can be made into a metallic effect paint with a flickering feeling; it is matched with primers of different colors , Can be used in decorative occasions with high requirements, such as cars, bicycles, instruments, meters, and woodware. Iron-transparent pigments' strong absorption of ultraviolet rays makes them useful as ultraviolet shielding agents in plastics, but also in packaging plastics such as beverages and medicines. Nano iron oxide black also has broad application prospects in electrostatic shielding coatings. Fe3O2 nano coatings with good electrostatic shielding have been successfully developed. Such nanoparticles with semiconductor properties have higher conductivity than conventional oxides at room temperature, and thus can play an electrostatic shielding role.

2. The application of nano-iron oxide in ink materials
Iron yellow can be used for coating the outer wall of cans. The nano iron oxide red ink is reddish gold, especially suitable for the inner wall of cans. In addition, the iron red is resistant to high temperature of 300 ℃. It is a rare pigment treasure in the ink. In order to improve the printing quality of banknotes, nano-iron oxide pigments are often added to banknote printing inks to ensure indicators such as the chroma and chroma of banknotes.

3. Application of nano-iron oxide in colorant
As people's living standards improve, people pay more and more attention to colorants used in medicine, cosmetics, and food. Non-toxic colorants have become the focus of attention. Nano-iron oxide is a good colorant under strict control of arsenic and heavy metal content. Nano-iron oxide can be used to make powder in cosmetics. If used in combination with pearlescent pigments, they can color the pearlescent pigments and increase the charm of pearlescent powders. Pharmaceutical gelatin capsules, jellies and certain beverages also use transparent iron oxide as a coloring agent.

4. Application of nano-iron oxide in light absorbing materials
The quantum size effect of nanoparticles makes it absorb blue light shift at a certain wavelength and broaden the absorption band of light at various wavelengths. The ultraviolet absorption material of nanoparticles is made using these two characteristics . Generally, the nanoparticle UV absorbing material is made by dispersing the microparticles into the resin to make a film. The absorption capacity of this film to ultraviolet light depends on the size of the nanoparticles and the amount and composition of the nanoparticles in the resin. The Fe2O3 nanoparticle polysterol resin film has a good absorption capacity for light below 600 nm and can be used as an ultraviolet filter for semiconductor devices.

5. Application of nano-iron oxide in magnetic materials and magnetic recording materials
The size of the magnetic particles as a magnetic recording unit must meet the following requirements: the length of the particles should be less than the recording wavelength; the width of the particles (if possible length is also included) should be much smaller than the recording depth; the recording volume of one unit should be as much as possible There are more magnetic particles. Nano Fe2O3 has good magnetic properties and good hardness. Oxymagnetic materials mainly include soft magnetic iron oxide (α-Fe2O3) and magnetic recording iron oxide (γ-Fe2O3). Magnetic nanoparticles have the characteristics of single magnetic domain structure and high coercive force due to their small size. Using them to make magnetic recording materials can improve the signal-to-noise ratio and improve the image quality. At present, the magnetic ultrafine particles generally used in video tapes are needle-like particles of iron or iron oxide (such as needle-shaped γ-Fe2O3).

6. Application of nano-iron oxide in targeted medicine
Directed medicine is one of the hotspots in current pharmaceutical technology research. Under the action of an external magnetic field, through the magnetic navigation of the carrier-nanoparticles, the drug is moved to the lesion site to achieve the purpose of directional treatment. This can not only greatly improve the efficiency of the drug, but also reduce the amount of the drug on other organs of the human body, thereby effectively avoiding the drug from harming other organs of the human body while acting on the lesion. Magnetic iron oxide bio-nanoparticles have specific surface effects and magnetic effects, are easy to orientate, have no side effects on the human body, and can be used as effective carriers for drug orientation. According to reports, magnetic iron oxide encapsulated dextran biological nanoparticles can be used as gene carriers. Under acidic conditions, the nanoparticles exhibit DNA binding and resistance to DNASE-I digestion. The surface of Fe3O4 magnetic particles from 10 nm to 50 nm is coated with methacrylic acid and the size is 200 nm. This sub-micron particle carries proteins, antibodies and drugs that can be used for cancer diagnosis and treatment. This kind of local treatment has good effects and few side effects, and it is likely to be the direction of cancer treatment.

7. Application of nano-iron oxide in catalyst
Nano-iron oxide has a huge specific surface and significant surface effect, and is a good catalyst. Due to the small size of nanoparticles, the volume percentage of the surface is large, the bond state and electronic state of the surface are different from the inside of the particle, and the incomplete coordination of the surface atoms leads to the increase of the active sites on the surface. The activity and selectivity of catalysts made with nanoparticles are higher than those of ordinary catalysts, and they have a long life and are easy to operate. Hollow spheres made of nano-α-Fe2O3 are floated on the surface of wastewater containing organic matter. Using sunlight to degrade organic matter can accelerate the wastewater treatment process. This method is used by the United States, Japan, etc. to deal with pollution caused by offshore oil spills. Nano-α-Fe2O3 has been directly used as a catalyst for oxidation, reduction and synthesis of high molecular polymers. The nano-α-Fe2O3 catalyst can increase the cracking rate of petroleum by 1 to 5 times, and the burning speed of solid propellants made with it as a combustion catalyst can be increased by 1 to 10 times compared to the burning speed of ordinary propellants. Rockets and missiles are very beneficial.

8. Application of nano-iron oxide in ceramic materials
Iron oxide system ceramics were first widely used as mesomorphic ferrite with special magnetic properties. At present, the ultrafine powders used in ceramics of the iron oxide unit system are mostly prepared by the coprecipitation method. The average particle size of the iron oxide powder prepared by this method is generally 40 nm to 60 nm, and the specific surface area is 30 m2/g to 60 m2/ g, The gas-sensitive ceramics prepared with it have good sensitivity. However, due to the different precipitation rates of the reactants in the co-precipitation method, it is often difficult to obtain atomic-scale mixing. The ceramics sintered by this method may have uneven microstructure, so the co-precipitation method cannot be used to develop oxidation Study on the ultrafine powder of iron multiple system ceramics.

9. Nano iron oxide other applications
Nano-iron oxide is also used in other aspects, such as magnetic iron oxide embedded in macromolecule dextran can be used as a magnetic resonance imaging enhancer for liver and spleen, using nano-scale iron oxide and NT to form a mixed explosive to increase the explosive heat of the explosive Wait.

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