Plate-like titanate/cobalt blue pigment composite was successfully synthesized by mixing cobalt blue (CoAl2O4) pigment nanoparticles with plate-like lepidocrocite-type potassium lithium titanate (K0.8Li0.27Ti1.73O4, PLT) microparticles in water in order to improve the comfort and covering ability when applied on skin as cosmetics. PLT was synthesized by KCl flux method at 1000°C for 5 h using K2CO3, Li2CO 3 and TiO2 as starting materials, while CoAl 2O4 nanoparticle was synthesized by mixing Co(NO 3)2 · 6H2O and Al(NO3) 3 · 9H2O with the molar ratio of Co:Al 1:6 at pH 9 followed by calcination at 1000°C for 1 h. The morphology of the PLT/CoAl2O4 composite strongly depended on the solution pH. Since in a low pH solution, the surface of PLT was negatively charged, while that of cobalt blue was positively charged, CoAl2O4 nanoparticles were homogenously coated on the surface of PLT by electrostatic attraction force. PLT/CoAl2O4 composites obtained showed nice feeling, high flickering pearlescent, excellent UV-shielding characteristic and novel blue color.
ASJC Scopus subject areas
- Materials Science(all)