The La2Ti2O7:Pr3+-coated fluorescent pearlescent pigment (FPP) was prepared as follows: preparation of TiO2-mica pearlescent pigment; subsequently coated with lanthanum hydroxide and praseodymium hydroxide; finally treated with high-temperature annealing to form La2Ti2O7:Pr3+. The obtained samples were characterized by means of scanning electron microscopy (SEM), pan-automatic chromatis-meter, laser particle size analyzer, photoluminescence excitation (PLE) and emission (PL). It is shown that the surfaces of FPP are homogeneous, dense and smooth when pH = 8.0. Moreover, the color shifts to a green-yellow hue for FPP compare with TiO2-mica pearlescent pigment. Besides, strong blue emission at 504 nm and red emission at 605 nm are observed on FPP.

This paper reports an increment of conformal metal oxides or nonmetal oxides films with good crystallinity coating on natural mica synthesized by liquid phase deposition. PEG1000 and KH550 were used to increase the adsorption of oxalic acid on the mica surface. Hence, the metal ions can react with the oxalic acid, resulting in uniform and compact thick films. The potasrmanganate titration and infrared ssium pepectroscopy were adopted to obtain the optimum dosage of PEG1000 and KH550. It is shown that the condition with the usage of PEG1000 of 0.4 g/L, KH550 of 9.76 g/L, temperature of 30 °C and mixing of 4 hours is appropriate.

The SiO2-coated α-Al2O3 pearlescent pigment was prepared by liquid phase deposition (LPD). The effects of concentration of sodium silicate solution, reaction temperature and pH value of the aluminum oxide suspending liquid were systemically studied in this paper. The obtained samples were characterized by scanning electron microscopy (SEM). The results showed that when the process parameters are the concentration of sodium silicate solution of 0.1 mol/L, the reaction temperature of 80 °C and the pH value of 9.0, the high quality of SiO2-coated α-Al2O3 pearlescent pigment could be obtained.