TY - JOUR
T1 - Dense silica coating of titania nanoparticles by seeded polymerization technique
AU - El-Toni, Ahmed Mohamed
AU - Yin, Shu
AU - Sato, Tsugio
N1 - Funding Information:
This research was carried out as a one of the projects in MSTEC Research Center at IMRAM, Tohoku University and partially supported by the Ministry of Education, Culture, Sports, Science and Technology, a Grant-in-Aid for the Scientific Research of Priority Areas (Panoscopic Assembling and High Ordered Functions for Rare Earth Materials).
PY - 2006/2/15
Y1 - 2006/2/15
N2 - Titania is of potential interest as an ultraviolet (UV) radiation blocking material in personal care products because of its excellent UV light absorption property. Its high photocatalytic activity, however, facilitates the generation of reactive oxygen species, which can oxidize and degrade other ingredients during its formulation, raising safety concerns. Coating of titania nanoparticles with a silica layer could help in depression of their photocatalytic activity by disturbing the formation of radicals produced by the reaction of oxygen and/or water with the electron-hole pair. Titania nanoparticles were coated with amorphous silica using a seeded polymerization technique. The silica shell was confirmed by TEM, electron probe microanalysis (EPMA), and FT-IR. The photocatalytic activity was evaluated for the coated powder to investigate the efficiency of silica coating as well.
AB - Titania is of potential interest as an ultraviolet (UV) radiation blocking material in personal care products because of its excellent UV light absorption property. Its high photocatalytic activity, however, facilitates the generation of reactive oxygen species, which can oxidize and degrade other ingredients during its formulation, raising safety concerns. Coating of titania nanoparticles with a silica layer could help in depression of their photocatalytic activity by disturbing the formation of radicals produced by the reaction of oxygen and/or water with the electron-hole pair. Titania nanoparticles were coated with amorphous silica using a seeded polymerization technique. The silica shell was confirmed by TEM, electron probe microanalysis (EPMA), and FT-IR. The photocatalytic activity was evaluated for the coated powder to investigate the efficiency of silica coating as well.
KW - Photocatalytic activity
KW - Seeded polymerization
KW - Silica coating
KW - Titania nanoparticles
UR - http://www.scopus.com/inward/record.url?scp=31144437855&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=31144437855&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2005.10.012
DO - 10.1016/j.colsurfa.2005.10.012
M3 - Article
AN - SCOPUS:31144437855
VL - 274
SP - 229
EP - 233
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
IS - 1-3
ER -