REVIEW There are three types of titanium dioxide, namely anatase, rutile and plate titanium type. The first two crystal types belong to the tetragonal crystal system, while the latter belongs to the orthorhombic crystal system. Compared with anatase type titanium dioxide, rutile type titanium dioxide has more stable physicochemical properties, higher hardness, density, dielectric constant and refractive index, so it has important application value in sunscreen, cosmetics, plastics, masterbatch, pipe, rubber and leather industry. Moreover, rutile titanium dioxide can better absorb light waves less than 410nm, and the absorption range is greater than anatase type (350nm). The band width of rutile titanium dioxide is about 3.2 eV, and the band width of anatase titanium dioxide is 3.0 eV, which makes the photocatalytic activity of rutile titanium dioxide lower than that of anatase titanium dioxide, but the weather resistance is better. Therefore, rutile titanium dioxide has unique advantages in UV shielding and is one of the most widely used UV shielding agents.
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