Nano-particles have important scientific research value. They build a bridge between big substances and atoms and molecules. The physical properties of bulk materials are usually independent of size, but they are usually not the case at nanometer scale.
At present, some special physical properties have been observed, such as quantum confinement of semiconductor nanoparticles, surface plasmon resonance of some metal nanoparticles, superparamagnetism of magnetic materials and so on. Solid and soft nanoparticles are also made. Liposomes are typical nanoparticles with solid-like properties.
Extended data:
Structure of nanoparticles
The morphology of nanoparticles can be latex, polymer, ceramic particles, metal particles and carbon particles. Nanoparticles are increasingly used in medicine, sunscreen cosmetics and other fields.
Nanoparticles can penetrate into membrane cells and spread along synapses, blood vessels and lymphatic vessels of nerve cells. At the same time, nanoparticles selectively accumulate in different cells and certain cell structures.
The strong permeability of nanoparticles not only provides effectiveness for the use of drugs, but also poses a potential threat to human health. But so far, there is little research on the harm of nanoparticles to human health.
Baidu encyclopedia-nanoparticles