Nanopowder may also be known as nanoparticles. It refers to extremely fine particles with an average size of 1-100nm. Others call them ultrafine particle. Their size is greater than that of atom clusters but less than ordinary particles. It can take a variety of shapes such as rod, rod, sponge or plate. There are many different compounds that can make up nanoparticles.
Properties and Nanoparticles
1. It is important to understand the thermal characteristics
They have lower melting points and temperatures that are sinterable than standard powders. Because of interface and surface effects, this is possible.
For instance, bulk Pb melts at 600k. 288k drops the melting temperature of 20nm diameter spherical pieces of Pb. Meanwhile, nano-Ag particles start to melt below 373k. Traditional Ag has a much lower melting point than 1173k. Furthermore, the nanoTiO2 becomes densified when heated above 773k. For large-grain samples to reach the same level of densification, heat up to 873k.
2. Optical Characteristics
Broadband, strong absorption
By reducing the size to nanoparticles it is almost impossible to see and its reflectance drops sharply.
Certain nanoparticles can be compared to silicon dioxide, SiC and Alumina. They have a broad energetic absorption spectrum in the infrared. ZnO (ferric oxide), and titanium dioxide nanoparticles all have a wide energetic absorption spectrum in ultraviolet light.
Both blue and red shift
Nanoparticles, when compared to bulk materials have a greater blue shift in their absorption bands, which means the absorption reaches the shorter wavelength direction. Sometimes, though, it shifts to a long-wave direction under certain conditions. If the particle size has been reduced to the nanometer scale, this is known as’red shift’.
3. Chemical properties
You can use it as a catalyst because of the surface effect.
Application to nanoparticles
1. Nano coating
Nano-coating uses surface technology to apply part or all of the nano-powder-containing material to the substrate. Nano powder has unique surface properties that allow for new design possibilities.
For example, nanoparticles can become surface coatings. They will alter optical properties such as light transmission, optical nonlinearity, light reflectance, and light absorption. These nanoparticles are used in many industries, including the lighting industry. A high-pressure sodium lamp converts 69% of its electricity into infrared Rays. Very little visible light remains. Also, the lamp’s life span will decrease if heated.
People have been studying the nano-infrared layer. A nano-powder made of silicon dioxide, aluminum oxide and iron oxide has been combined. This can absorb intense infrared rays and can then be used as a military garment. It will not be detected by hostile hot bands, and it can also reduce your weight by up to 30%.
2. In environmental protection
A lack of minerals and the environmental effects of pollution are two issues that have put people off. It has been an exciting time for the application of nanomaterials in pollution reduction, environmental governance, as well as environmental protection. These nanoparticles have many benefits, including being antibacterial, anticorrosive or deodorant. These nanoparticles also can absorb heavy metals to clean water.
3. Photocatalysis with nanoparticles
It can also be used to degrade pesticides, protect the environment, and make organic matter. Photocatalysis has high efficiency due to its small particles and specific surface. Furthermore, most electrons and hole generated by the nanoparticles cannot recombine at the surface. Thus, chemical reaction activity and their low diameter are high.
Cataniadagiocare Technology Co.,Ltd manufactures high-quality iron, nickel,, copper, and titan nanoparticles. These nanoparticles may be used widely in many industries, including ceramics and wear-resistant. industries.
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