Nano-copper has superplastic ductility and is a pure substance. Articles made of nano-materials have many peculiar properties. For example, nano-copper has superplastic ductility and can be stretched more than 50 times at room temperature without cracking.
Researchers at the French National Research Center found that the mechanical properties of copper nanocrystals with an average volume of only 80 nanometers are amazing. The strength is not only three times higher than that of ordinary copper, but also the deformation is very uniform, and there is no obvious regional narrowing phenomenon. This is the first time that scientists have observed such a perfect elastic-plastic behavior of matter. This mechanical property of copper nanocrystals opens up a bright prospect for making elastic materials at room temperature.
Extended data:
Nano-copper reacts with oxygen more easily than ordinary copper.
The copper atoms in nano-copper are the same as those in ordinary copper, but the nano-copper particles are very small.
The chemical properties of nano-copper are more active than ordinary copper, even changing its inherent properties, but nano-materials do not change the state of matter.
Sterilization mechanism of copper: Copper reacts with water under aerobic conditions to produce hydroxyl radical (-OH) and reactive oxygen ion (O2-), which has a strong redox effect and can destroy the proliferation ability of microbial cells, thus inhibiting and killing microorganisms. With the increase of specific surface area, nano-copper is more prone to chemical reaction.
Copper is a heavy metal, and it is also recognized that heavy metals have bactericidal effect (such as silver). Heavy metals are toxic, and reaching a certain dose in human body will affect health and even cause poisoning (silver also has certain neurotoxicity and genotoxicity). Copper is one of the essential trace elements in human body, which can be metabolized and absorbed by human body, while silver is difficult to metabolize in human body and will be enriched in human body. Therefore, the use of nano-silver as antibacterial agent has been banned in Europe and America, and some of it has been replaced by nano-copper.
Baidu encyclopedia-nano copper