title: Preparation of TiO₂ nanocrystallite powders coated with 9 mol% ZnO for cosmetic applications in sunscreens.
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(2)O 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(2)Ti(3)O(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.
authors.affiliation: Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan.
authors.forename: Horng-Huey
authors.initials: HH
authors.lastname: Ko
authors.affiliation: Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan.
authors.forename: Hui-Ting
authors.initials: HT
authors.lastname: Chen
authors.affiliation: Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan.
authors.forename: Feng-Ling
authors.initials: FL
authors.lastname: Yen
authors.affiliation: Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan.
authors.forename: Wan-Chen
authors.initials: WC
authors.lastname: Lu
authors.affiliation: Department of Resources Engineering, National Chen Kung University, 1 Ta-Hsueh Road, Tainan 70101, Taiwan.
authors.forename: Chih-Wei
authors.initials: CW
authors.lastname: Kuo
authors.affiliation: Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan.
authors.forename: Moo-Chin
authors.initials: MC
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis / Q000737:chemistry; D003358:Cosmetics; D006801:Humans; D053758:Nanoparticles / Q000737:chemistry*; D011208:Powders; D013473:Sunscreening Agents / Q000138:chemical synthesis* / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; D003358:Cosmetics; D011208:Powders; D013473:Sunscreening Agents; C009495:titanium dioxide; D014025:Titanium; D015034:Zinc Oxide