Synthesis And Characterization Of Nd₂（CO₃）₃·8H₂O,Gd₂O₃and Eu₂O₃Micro-nano Particles

Based on the liquid-phase method, we reported the synthesis of the Nd2(CO3)3·8H2O micro-nano particles with different morphologies by using the solvothermal method. We also reported the synthesis of Gd2O3and Eu2O3micro-nano particles with various morphologies by using CTAB-assisted hydrothermal method. Possible formation mechanisms of the morphological structure of micro-nano particles are proposed and discussed. The major contents can be summarized as follow:1. Different structures of Nd2(CO3)3·8H2O micro-nano particles with the morphologies of polyhedral, fishtail-like and needle-like were prepared in W/O reverse microemulsion composed of cetyltrimethylammonium bromide (CTAB), n-butanol,n-octane, Nd(NO3)3aqueous solution(sodium carbonate aqueous solution). The crystal shape, morphologies and size of Nd2(CO3)3·8H2O micro-nano particles were characterized by X-ray powder diffraction (XRD), thermal analysis (DSC-TGA), environmental scanning electron microscope (SEM), transmission electron microscope (TEM). The effects of the molar ratio of water to the CTAB and solution concentration of Nd(NO3)3on the morphologies and size of Nd2(CO3)3·8H2O were studied. Possible formation mechanisms of the morphological structure of micro-nano particles are proposed and discussed.2. Varies morphology and different size of Gd2O3micro-nano particles were synthesized by CTAB-assisted hydrothermal method. The structures, morphologies and size of the Gd2O3and their precursors were characterized by XRD, TG, SEM, TEM and fluorescence spectrophotometer, respectively. The effects of the reaction temperature on the morphologies and size of Gd2O3were studied. The experimental results showed that the dispersive different morphologies of Gd2O3were obtained by the CTAB-assisted hydrothermal method. The changes of Gd2O3on the morphologies were the results of self-assembly under the combined action of temperature, pressure and the surfactant. 3. Varies morphology and different size of Eu2O3micro-nano particles were synthesized by CTAB-assisted hydrothermal method. The structures, morphologies and size of the Eu2O3and their precursors were characterized by XRD, TG and SEM, respectively. The effects of the amount of CTAB, reaction time and pH on the morphologies and size of Eu2O3were studied. The experimental results showed that the dispersive different morphologies of Eu2O3were obtained by the CTAB-assisted hydrothermal method. The Eu2O3particles with good dispersion were regular and uniform with existence of CTAB. The changes of Gd2O3on the morphologies were the results of self-assembly under the increasing of reaction time and the enhance of alkalinity.