Three methods for the formation of nano-zinc oxide have been known to everyone, but recent research on nano-zinc oxide has entered a deeper level, which is a new combination of granule nano-zinc oxide in skin and commercial preparation. the study.
1. Indirect method: The pure metal zinc is evaporated at a high temperature of about 1000 degrees, so that steam is formed, and the steam contacts the oxygen in the air, thereby generating a chemical reaction to produce zinc oxide. After the temperature is lowered, particles are formed, and zinc oxide is obtained through the cooling container.
2, direct method: without the use of pure zinc, zinc-containing compounds for indirect method manipulation, can also get zinc oxide.
3. Chemical wet method: The zinc salt water is prepared by a chemical reaction, and the precipitate is subjected to a physical method such as filtration, washing, drying, and then fired at a high temperature to obtain zinc oxide.
The zinc oxide of the nanoparticles, the compound of zinc oxide forms a form of individual particles of diameter as small as 20 nanometers. Transparent particles, which effectively filter out ultraviolet (UVA) and ultraviolet (BB) light, are then coated with an inert silicon or aluminum oxide layer and tend to clump together in groups of 200 to 500 nanometers in diameter.
By comparison, a person’s red blood cells have an average diameter of 100 nanometers. The use of the main zinc oxide in this form includes harmful solar radiation in the zinc oxide lotion as a sealer and as an antibacterial agent and a fungicidal compound added to clear coatings such as varnishes, wood surfaces. Other uses of nanoparticulate zinc oxide include windows and spectacles coated as protective ultraviolet (UV) light on plastic films, or textile fabrics made from synthetic polymers.
Commercially prepared nanoparticles of zinc oxide can be made in such a way that no agglomeration occurs and the individual particles remain separated from one another. The surface coatings on the particles can also be hydrophobic or hydrophilic, and they can be uniformly produced at a diameter of 20, 40, or 60 nanometers depending on their specific needs.
One of the earliest and most controversial uses of nano zinc oxide is a sunscreen lotion as a UV-blocker. The unique size of the granules in the sunscreen of zinc oxide, rather than the chemical nature of the compound itself, poses a risk to human health. This is because, in such small scale, nanoparticles have a larger surface area compared to their net mass, which can make them highly reactive substances. The tiny particles of size enable them to pass through the blood-brain barrier, experimental animal studies, and they have killed the formation of neural stem cells (NSCs). These cells are responsible for regenerating human neurons in the brain and their destruction may lead to the ultimate degenerative brain disease.
Entering dangerous zinc oxide nanoparticles, which is currently used in some foods as well as many zinc oxide products for skin care research is still in its early stages. Some studies have shown that particles over 30 nanometers in size do not pose any significant risk of increased health, while other studies have found that the entire range of sizes of nano zinc oxide poses a danger. Their products, the most commonly used, such as zinc oxide gelatin or ointment, are applied to the surface of the skin.