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

摘要

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 mu m in diameter via soft solution processes, where the micaceous titanate was prepared by reacting K2CO3, Li2CO3 and TiO2 using K2MoO4 flux at 950 degrees C. After putting micaceous potassium lithium titanate particles in deionized water at 40 degrees C, appropriate quantities of 3 M NaOH aqueous solution and 0.8M CeCl3-0.2M 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 degrees C for 1h 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.