Panoscopic assembling and UV-shielding properties of calcia-doped ceria with micaceous lepidcrocite type potassium lithium titanate via soft chemical processes

In order to attain further performance improvements concerning UV-shielding, calcia-doped ceria (Ce0.8Ca0.2O1.8) nanoparticles were coated on micaceous lepidocrocite-type potassium lithium titanate (K0.8Li0.27Ti1.73O4), 10-20 μm in diameter via soft solution processes, where the micaceous titanate was prepared by reacting K2CO3, Li2CO3 and TiO2 using K2MoO4 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 CeCl3-0.2 M CaCl2 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 H2O2 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 K0.8Li0.27Ti1.73O4 coated with white Ce0.8Ca0.2O1.8 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.