2008 年 22 巻 p. 17-21
Plate-like hydrated cerium phosphate, Ce2(PO4)2HPO4•H2O, has attracted attention because of its unique UV-shielding ability with excellent comfort when applied on the skin. Optimization of preparation conditions of hydrated cerium phosphate is required to obtain medium size plate-like particles of 5-50 μm in diameter which provide good comfort for human skin. Plate-like hydrated cerium phosphate, ca 20 μm in diameter, was obtained by the hydrothermal reaction of Ce(SO4)2 in H3PO4 aqueous solution at 200oC for 3 h. The sample showed excellent comfort, absorption ability of light less than 450 nm of wavelength and lower oxidation catalytic activity than undoped ceria.
