Since Gleiter et al. took the lead in preparing nanomaterials in 1991, nanomaterials have made great progress after 10 years of development. Nowadays, there are many types of nano materials, which are divided into metal materials, nano ceramic materials, nano semiconductor materials, nano composite materials, nano polymer materials, etc. according to their materials. Nanomaterials are super-microparticle materials, called "new materials in the 21st century", and have many specific properties.
For example, the strength and hardness of the material sintered with nano-scale metal powder is much higher than the original metal, and the nano-metal turns from a conductor into an insulator. General ceramics have low strength and are very brittle. However, ceramics sintered from nano-sized powders not only have high strength but also good toughness. The melting point of nanomaterials will decrease as the diameter of the ultrafine powder decreases. For example, the melting point of gold is 1064°C, but the melting point of 10nm gold powder is reduced to 940°C, and the melting point of snm gold powder is reduced to 830°C, so the sintering temperature can be greatly reduced. The sintering temperature of nano-ceramics is much lower than the original ceramics. Nano-sized catalysts are added to gasoline. Can improve the efficiency of the internal combustion engine.
Adding solid fuel can speed up the rocket. The medicine is made into nanometer powder. It can be injected into the blood vessel and enter the capillaries smoothly.