Abstract
The preparation of TiO 2 nanocrystallite powders coated with and without 9 mol% ZnO has been studied for cosmetic applications in sunscreens by a co-precipitation process using TiCl 4 and Zn(NO 3) 2·6H 2O as starting materials. XRD results show that the phases of anatase TiO 2 and rutile TiO 2 coexist for precursor powders without added ZnO (T-0Z) and calcined at 523 to 973 K for 2 h. When the T-0Z precursor powders are calcined at 1273 K for 2 h, only the rutile TiO 2 appears. In addition, when the TiO 2 precursor powders contain 9 mol% ZnO (T-9Z) are calcined at 873 to 973 K for 2 h, the crystallized samples are composed of the major phase of rutile TiO 2 and the minor phases of anatase TiO 2 and Zn 2Ti 3O 8. The analyses of UV/VIS/NIR spectra reveal that the absorption of the T-9Z precursor powders after being calcined has a red-shift effect in the UV range with increasing calcination temperature. Therefore, the TiO 2 nanocrystallite powders coated with 9 mol% ZnO can be used as the attenuate agent in the UV-A region for cosmetic applications in sunscreens.
Original language | English |
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Pages (from-to) | 1658-1669 |
Number of pages | 12 |
Journal | International Journal Of Molecular Sciences |
Volume | 13 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2012 |
Keywords
- Anatase
- Co-precipitation process
- Rutile
- Sunscreens cosmetic application
- Surface modification with 9 mol% TiO