Synthesis of SmOHCO3 micro/nano particles from the coupling route of homogeneous precipitation with microemulsion

SmOHCO3 micro/nano particles were prepared in water/oil (W/O) reverse microemulsion composed of cetyltrimethyl ammonium bromide (CTAB), n-octane, n-butanol, Sm(NO3)3·6H2O and urea aqueous solution by the coupling route of homogeneous precipitation with microemulsion. The nanoparticles were characterized and analyzed by X-ray powder diffraction (XRD), thermal gravimetric and differential thermal gravimetric analysis (TG-DTG), Fourier transform infrared absorption spectra (FT-IR) and scanning electron microscope (SEM). The results showed that the phase SmOHCO3 micro/nano particles was in agreement with pure orthorhombic phase. The different morphologies of SmOHCO3 micro/nano particles with good monodispersity and size were obtained by regulating the reaction temperature and reaction time. Possible formation mechanisms of the morphological structure of SmOHCO3 were proposed and discussed.

SEM images of the SmOHCO3 microstructures (C[Sm(NO3)3]=0.25 mol/L, ω=15, and t=6 h) at different reaction temperatures (a) 90 °C, (b) 100 °C, (c) 110 °CFigure optionsDownload as PowerPoint slide