The Property And Application Of Nanoparticles
Nanopowder can also be called nanoparticles. These are ultra-fine particles of size 1 to 100 nm. Ultrafine particles are sometimes used to describe it. They are smaller than normal particles, but larger than clusters of atoms. You can choose from spherical to rod shapes, such as horns, plates, rods, or rods. You can find metals and oxides in nanoparticles.
The properties of nanoparticles
1. Temperature characteristics
These nanoparticles' melting and sintering temperatures are lower than those of traditional powders. It is because of surface and interface effects.
Bulk Pb has a melting point 600k. However, 288k lowers 20nm-spherical Pb's melting points. The melting point at nano-Ag particles is below 373k. While conventional Ag melts much faster than that of Nano-Ag, it is still well above 1173k. Additionally, nano-TiO2 will densify when heated at 773k. To achieve the same result with large-grain samples, it must be heated up until 873k. The sintering temperature is also a significant factor.
2. Optic properties
It becomes nearly black when the particle size drops to nanoparticles. The reflectance of visible light also falls sharply.
A few nanoparticles, such as silicon nitride and SiC, can absorb infrared energy at a wide range of frequencies. ZnO, titanium dioxide, and ferric oxide nanoparticles also have broad energetic absorption spectrums for ultraviolet light.
Red and blue shift
When nanoparticles are smaller than bulk materials, they have an absorption band that has a blue shift. That is, it moves towards the short wavelength direction. However, under some conditions, this absorption band can shift to the long wave direction.
3. Chemische properties
Because of its surface effect it is possible to use as a catalyst for increasing the reaction activity.
Nanoparticles are used in:
1. Nano coating
Nano-coating uses surface technology to apply part or all of the nano-powder-containing material to the substrate. New features can be added to the nano-powder-containing material because of its unique surface characteristics.
You can make nanoparticles into coatings that change the optical properties of the surface. These include optical nonlinearity (light absorption), light reflection and light transmission. There are many uses for nanoparticles in the lightbulb industry. The high-pressure sodium lamp uses 69% of electricity. This is infrared energy. Lamp life will be reduced if the lamp is heated.
Numerous people have studied nano-infrared coatings. The nano-powder is composed of iron oxide, silicon dioxide and aluminum oxide. It absorbs infrared light well and can be made to military uniforms. It is able to reduce 30% weight and avoid detection by enemy hot bands.
2. Use in the protection of the environment
Both the problem of environmental pollution and the shortages in mineral energy have long bothered humanity. A thriving industry has emerged from the use of nanomaterials for environmental protection and environmental governance. The nanoparticles are antibacterial and anticorrosive. They also have the ability to deodorize, clean the air, improve the environment, facilitate decay, and purify it. Nanoparticles can be used to absorb heavy metal ions and purify water. They also have the ability to adsorb bacteria and viruses as well.
3. Photocatalysis nanoparticles
You can use photocatalysis to protect the environment, reduce pesticides and organic matter. The nanoparticles have a small diameter and occupy a large area. They also exhibit high photocatalytic efficacy. Besides, the majority of electrons generated by photocatalysis will not combine with the surface. Therefore, the chemical reaction activities are high and the hole count is low.
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Mis-asia, Misasia advanced material Tech Co., Ltd., a company that manufactures new nano material, has over 12 years of experience in chemical product research and development. We are available to help you find high-quality, new nano material.