Application Areas Of Nanoparticles
Nanoparticles refer to particles with a particle size between 1-100nm (nanoparticles are also called ultrafine particles). It belongs to the category of colloidal particle size. They are in the transition zone between clusters of atoms and macroscopic objects, between the microscopic system and the macroscopic system. They are groups composed of a small number of atoms or molecules, so they are neither typical microscopic systems nor typical macroscopic systems.
There are many active centers on the surface of nanoparticles, which provides the necessary conditions for nanoparticles to act as catalysts. At present, the catalytic reaction with nano particles can directly use nano particles such as platinum black, silver, alumina, iron oxide, etc. as catalysts in the oxidation, reduction and synthesis of high molecular polymers, which can greatly improve the reaction efficiency and use nano nickel powder As a rocket solid fuel reaction catalyst, the combustion efficiency can be increased by 100 times.
The catalytic reaction also shows selectivity. For example, the oxidation reaction of propionaldehyde with a silicon-supported nickel catalyst shows that the selectivity changes sharply when the nickel particle size is below 5nm, the decomposition of aldehyde is controlled, and the selectivity to alcohol is sharply increased.