② The quantum size effect and ③ small size effect are more closely related to the sound, light, electricity, and magnetism of nanoparticles. For example, the threshold of the absorption spectrum of atoms in nanomaterials undergoes a blue shift, and the Fermi level transitions from continuous to separated, resulting in optical nonlinearity. These are not discussed here, but as common knowledge, we should understand that the so-called airplane invisibility refers to the principle of changing the size of nanoparticles to create microwave absorbing nanomaterials with a certain bandwidth for electromagnetic wave shielding.

④ Macroscopic quantum tunneling effect: My understanding is that tunneling effect refers to the energy of microscopic substances such as electrons that can cross thermal barriers in physics. Compared to electrons, nanoparticles naturally belong to macroscopic substances. After discovering that they also have tunneling effects, they are called macroscopic quantum tunneling effects, which are of great significance for the miniaturization of electronic devices.

By the way, I personally feel that in China, the relationship between people and the technology field is very subtle. I don't know if the field varies from person to person or if people are named after the field. In China, electric vehicles and nanotechnology have similar similarities. It's a bit of a 'wild speculation'.

Diamond, with its ultra-high strength and hardness, has become an important grinding material. Diamond, as the hardest substance in the world, has many excellent properties and is one of the allotropes of carbon element. Its special properties are determined by its infinitely extensible tetrahedral skeleton and trans conformation hexagonal ring structure.

The two most common elemental forms of carbon are high hardness diamond and soft and smooth graphite, which have different crystal structures and bond types. Each carbon in diamond is tetrahedral and four coordinated, similar to aliphatic compounds; Each carbon in graphite is a triangular triple coordinate, which can be seen as an infinite number of benzene rings fused together. It's interesting that the carbon allotrope system has completely extreme and very different cross-sectional ranges. It can be said that diamond is an abrasive, while graphite is a very good lubricant. Nevertheless, they can all be applied in the field of lubrication.

It is the ultra-high hardness of diamond that has sparked people's imagination about its application in lubrication technology. For example, if diamond is made into nano-sized particles, then:

① Nano diamond is a material with a particle size of 3-6nm and a specific surface area of 390-450g/m? It has strong covalent bonding and strong oleophilicity and hydrophobicity. Therefore, if a stable and dispersed colloidal system can be formed in lubricating oil, solid colloidal particles of nanodiamonds as extreme pressure anti-wear agents can be uniformly distributed in the lubricating oil. Through the lubricating oil as a carrier, the nanodiamond carbon can be transported to the friction interface, forming a superhard lubricating film supported by nanodiamonds and filled with base oil. When boundary lubrication conditions occur in the equipment, it will play a unique role.

② As the uneven micro peaks on the surface of the friction pair decrease, the contact area between the friction pairs increases rapidly and significantly, and the compression force on the oil film decreases rapidly. The oil film is not easily damaged, and the spherical and quasi spherical particles of nanodiamonds are embedded in the contact micro grooves between the friction pairs, with excellent bearing capacity. The friction surface forms a ball bearing effect, exhibiting good lubricity, turning sliding friction into rolling friction, reducing frictional resistance, and avoiding the occurrence of dry friction

Does the above assumption make sense?