カルシア固溶セリアナノ粒子被覆板状チタン酸リチウムカリウムの合成と紫外線遮蔽特性(<特集>希土類系物質の精密合成,形態制御および機能物性)

概要

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In order to attain further performance improvements concerning UV-shielding, the synthesis parameters of plate-like lepidocrocite related potassium lithium titanate were optimized and calcia-doped ceria (Ce_<0.8>Ca_<0.2>O_<1.8>) nanoparticles were coated on plate-like potassium lithium titanate (K_<0.8>Li_<0.27>O_4) , 10-20μm in diameter via solution processes, where the plate-like titanate was prepared by reacting K_2CO_3, Li_2CO_3 and TiO_2 using KCl flux at 950℃. After putting plate-like potassium lithium titanate particles in deionized water at 40℃, 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 throughout the reaction. Then, the desired amount of 2 M H_2O_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℃ for 1 h to obtain plate-like K_<0.8>Li_<0.27>Ti_<1.73>O_2 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.
2007-10-01