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On absorption of UV light, photo-generated titanium dioxide particles create singlet oxygen, superoxide anions (O2-) and hydroxyl radicals (OH-) that are potent free radicals (1,2). Irradiated particles of titanium dioxide can induce oxidative damage to DNA (2) which can lead to the development of mutant cells and skin cancers (3,4,5,6) and lipid peroxidation of essential functions on the cell membrane (7).
Fig. 6. AOPP measured on samples of MSSA with: A) 0.2 mg/mL P25TiO2NPs; B) 0.02 mg/mL P25TiO2NPs; C) 0.2 mg/mL VitaminB2@P25TiO2NPs; D) 0.02 mg/mL VitaminB2@P25TiO2NPs after 3 h of irradiation (red) and 6 h (blue). SD <1 (error bars too small to be seen) and p < 0.05 between C-D and A-B.
The other form in which titanium dioxide is produced is as an ultrafine (nanomaterial) product. This form is selected when different properties, such as transparency and maximum ultraviolet light absorption, are needed, such as in cosmetic sunscreens.
tio2 concrete factory. During this stage, the TiO2-infused concrete gains strength and stability. The curing conditions, including temperature and humidity, are closely monitored to optimize the properties of the final product.