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Int. J. Mol. Sci. 2012, 13(2), 1658-1669; doi:10.3390/ijms13021658
Article

Preparation of TiO2 Nanocrystallite Powders Coated with 9 mol% ZnO for Cosmetic Applications in Sunscreens

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 and
1,*
1 Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan 2 Department of Resources Engineering, National Chen Kung University, 1 Ta-Hsueh Road, Tainan 70101, Taiwan
* Author to whom correspondence should be addressed.
Received: 5 January 2012 / Revised: 18 January 2012 / Accepted: 18 January 2012 / Published: 3 February 2012
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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Abstract

The preparation of TiO2 nanocrystallite powders coated with and without 9 mol% ZnO has been studied for cosmetic applications in sunscreens by a co-precipitation process using TiCl4 and Zn(NO3)2·6H2O as starting materials. XRD results show that the phases of anatase TiO2 and rutile TiO2 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 TiO2 appears. In addition, when the TiO2 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 TiO2 and the minor phases of anatase TiO2 and Zn2Ti3O8. 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 TiO2 nanocrystallite powders coated with 9 mol% ZnO can be used as the attenuate agent in the UV-A region for cosmetic applications in sunscreens.
Keywords: anatase; rutile; surface modification with 9 mol% TiO2; sunscreens cosmetic application; co-precipitation process anatase; rutile; surface modification with 9 mol% TiO2; sunscreens cosmetic application; co-precipitation process
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ko, H.-H.; Chen, H.-T.; Yen, F.-L.; Lu, W.-C.; Kuo, C.-W.; Wang, M.-C. Preparation of TiO2 Nanocrystallite Powders Coated with 9 mol% ZnO for Cosmetic Applications in Sunscreens. Int. J. Mol. Sci. 2012, 13, 1658-1669.

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