titanium dioxide
| Price | $10 |
| Package | 1KG |
| Min. Order: | 10KG |
| Supply Ability: | 10000 kilograms/month |
| Update Time: | 2024-04-28 |
Product Details
| Product Name: titanium dioxide | CAS No.: 13463-67-7 |
| EC-No.: 201-070-7 | Min. Order: 10KG |
| Purity: 99 | Supply Ability: 10000 kilograms/month |
| Release date: 2024/04/28 |
Titanium dioxide is an inorganic substance with a chemical formula of TiO2. It is a white solid or powdered amphoteric oxide with a molecular weight of 79.9. It has non-toxic, best opacity, best whiteness and brightness, and is considered the best performance in the world today.
The strong UV resistance of titanium dioxide is due to its high refractive index and high photoactivity. Its anti-ultraviolet ability and its mechanism are related to its particle size: when the particle size is large, the UV blocking is mainly based on reflection and scattering, and it is effective for both mid-wave and long-wave ultraviolet. The sunscreen mechanism is simple covering, which is a general physical sunscreen, and the sunscreen ability is weak; as the particle size decreases, the light can pass through the particle surface of titanium dioxide, and the reflection and scattering of ultraviolet rays in the long-wave area are not obvious, but the centering The absorption of ultraviolet rays in the wave zone is obviously enhanced. Its sun protection mechanism is to absorb ultraviolet rays, mainly absorbing ultraviolet rays in the mid-wave region. It can be seen that the sunscreen mechanism of titanium dioxide for different wavelengths of ultraviolet rays is different. The blocking of ultraviolet rays in the long wave region is mainly based on scattering, and the blocking of ultraviolet rays in the medium wave region is mainly based on absorption.
The absorption mechanism of titanium dioxide for ultraviolet light may be: the electronic structure of nanometer titanium dioxide is composed of a conduction band formed by a valence electron band and an empty orbit. When it is irradiated by ultraviolet light, it has a larger energy than its band gap (about 3.2eV). The light is absorbed and the electrons in the valence band are excited to the conduction band. As a result, the valence band lacks electrons and holes are generated, forming electron-hole pairs that are easy to move and have strong activity. On the one hand, such electron-hole pairs can recombine with each other during various redox reactions, releasing energy in the form of heat or generating fluorescence, on the other hand, they can be dissociated into the crystal lattice and migrate freely to the surface of the crystal lattice. Or the free holes and free electrons in other reaction sites are immediately captured by the surface groups. Under normal circumstances, titanium dioxide will activate surface water to generate surface hydroxyl groups to capture free holes and form hydroxyl radicals. Free free electrons will quickly combine with absorbed oxygen to generate superoxide radicals, which will also kill surrounding bacteria and viruses. die. It can be seen that ultraviolet radiation, surface water activation degree and oxygen absorption rate are the three basic conditions for the photoactivity of titanium dioxide. It is precisely because nano-titanium dioxide will generate free radicals after absorbing ultraviolet rays, which will accelerate the aging of the skin and cause harm to the skin. Therefore, when using nano-titanium dioxide as a sunscreen, the three basic conditions should be reduced or eliminated to reduce or eliminate its photoactivity and reduce its harmfulness.
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Hebei Yime New Material Technology Co., Ltd.was established in 2010,is a professional manufacturer specialized in research and production of plant extract,cosmetic raw material and Health care.Our products are exported to more than forty countries and regions, such as Europe, North America, South America, the Middle East, Southeast Asia, etc. The whole production process conforms to international standards so as to ensure product quality effectively, and we provide better service for global customers. Customer satisfaction is our long-term desire. We will make full use of our own advantages, being aggressive and innovative.
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