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Basic Introduction To Nanoparticles

wallpapers Tech 2020-12-14
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.

It is foreseeable that nanoparticles should have some novel physical and chemical properties. Nanoparticles are distinguished from macroscopic object structures in that their surface area occupies a large proportion, and surface atoms have neither long-range nor short-range amorphous layers. It can be considered that the state of the atoms on the surface of the nanoparticle is closer to the gaseous state, while the atoms inside the particle may be in an orderly arrangement. Even so, due to the small particle size and large surface curvature, high Gilibs pressure is generated inside, which can cause some deformation of the internal structure. The structural characteristics of nanoparticles make it have the following four effects.
1. Volume effect
2. Surface effect
3. Quantum size effect
4. Macroscopic quantum tunneling effect.

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