Abstract
In order to attain further performance improvements concerning UV-shielding, calcia-doped ceria (Ce
0.8
Ca
0.2
O
1.8
) nanoparticles were coated on micaceous lepidocrocite-type potassium lithium titanate (K
0.8
Li
0.27
Ti
1.73
O
4
), 10-20 μm in diameter via soft solution processes, where the micaceous titanate was prepared by reacting K
2
CO
3
, Li
2
CO
3
and TiO
2
using K
2
MoO
4
flux at 950°C. After putting micaceous potassium lithium titanate particles in deionized water at 40°C, appropriate quantities of 3 M NaOH aqueous solution and 0.8 M CeCl
3
-0.2 M CaCl
2
mixed aqueous solution were simultaneously dropped, where the solution was stirred and pH was kept at 12 through the reaction. Then, the desired amount of 2 M H
2
O
2
solution was added and pH was also kept at 12. The slurry was filtrated and washed with water and methanol. The precipitate was fired at 700°C for 1 h to obtain micaceous K
0.8
Li
0.27
Ti
1.73
O
4
coated with white Ce
0.8
Ca
0.2
O
1.8
nanoparticles. Such panoscopic assembling successfully improved the comfort of the product when wearing it on the skin without compromising the UV-shielding ability, meanwhile greatly reducing the oxidation catalytic activity.