With human beings, there are wars against viruses and bacteria. Although every time we end up with human victory, we have paid a heavy price.
At present, the common PM2.5 masks on the market can only filter the particles with a diameter of 2.5 microns in the air, while the N95 mask can block 95% of the particles with a diameter of 2.5 microns in the air. At present, it is from Sars, influenza, Ebola, Mers Viruses can be suspended in the air, and the diameter is usually 60-140 nanometers, and the smallest diameter can reach 70-90 nanometers. By comparison, you will know that PM2.5 masks cannot withstand the invasion of viruses. If there is one The new type of protective equipment can resist the invasion of nano-level viruses, which will greatly reduce the infection rate of humans.

Add nano zinc oxide to the surface of the fiber, and a protective layer of nano-zinc oxide is formed on the surface to make a fabric, so that the fabric can resist nano-level viruses, which will greatly reduce virus invasion.

Antibacterial properties and mechanism of nanometer zinc oxide
1.1 Dissociation of zinc ions
Zinc ions play an important role in regulating protein metabolism in organisms, such as participating in the formation of coenzymes, enzymes, DNA-binding proteins, etc. However, high concentrations of zinc ions can destroy the internal environment of the bacteria and then destroy the bacterial structure. Electrolysis of zinc oxide in aqueous medium can release zinc ions, and free zinc ions are adsorbed on the surface of bacterial cell walls, which damages the bacterial cell wall and destroys the inherent morphology of the cell; in addition, nano-zinc oxide particles can also directly interact with the phospholipid bimolecular of the cell membrane. The layer contact causes cell death, destroys the integrity of the cell membrane, increases the possibility of nanoparticle entry, and finally leads to cell death to achieve antibacterial effect. In addition, the antibacterial feature of zinc oxide is that after the bacteria are killed, zinc ions can be removed from the cells. Free out and repeat the above process continuously.
1.2 The interaction force between nano-zinc oxide particles and bacteria
When the particle reaches the nanometer level, the physical properties of the particle change, with high surface activity and larger specific surface area. The force on the surface of the bacteria is increased, and it is easy to interact with the surface of the bacteria. The smaller the diameter of the nanoparticle, the mutual The stronger the effect, the antibacterial properties of nano zinc oxide may also be attributed to the interaction between nano-zinc oxide particles and the surface of the bacteria. Some scholars have observed that zinc oxide nanoparticles with small crystallite size have stronger antibacterial activity against Escherichia coli and Staphylococcus aureus than large crystallite size zinc oxide particles, and the release of small crystallite size zinc oxide nanoparticles has also been observed. The amount of zinc ions is much higher than that of large crystallite size zinc oxide particles, so zinc oxide nanoparticles have stronger bactericidal ability. In addition, since metal oxides are positively charged in water and can be combined with negatively charged groups on the surface of bacteria, electrostatic action strengthens the interaction between metal oxides and bacteria.

1.3 Active oxygen produced by nano-zinc oxide
Another antibacterial mechanism of nano-zinc oxide may be related to active oxygen, which can destroy the integrity of bacterial cells, thereby inhibiting the growth of bacteria. Zinc oxide is a wide-gap semiconductor oxide. When the photon energy of the irradiated light is equal to or greater than the energy of the zinc oxide's forbidden band width, electrons in the valence band will be excited to transition to the conduction band, which can lead to the formation of positive electricity prices. A band of free electrons with (holes) and negatively charged. On the surface of zinc oxide nanoparticles, holes react with hydroxyl groups and absorb water to generate hydroxyl radicals; in the presence of oxygen, lone electrons in the conduction band generate superoxide ions and hydroxyl radicals, and these superoxide ions and hydroxyl radicals Free radicals are active oxygen. Active oxygen and its derivatives can destroy bacterial cells, produce bacteriolysis or promote the aggregation of nanoparticles in the bacteria body and ultimately lead to the death of bacteria.

SAT NANO can supply ZnO 10-20nm, 30-50nm, 1um particle size, if you have any enquiry, please feel free to contact us at admin@satnano.com