writer：Longyu Li, Dianbin Qin, Xinlin Yang*, Guangyu Liu
keywords：Multi-layer microspheres; Ellipsoidal particles; Distillation precitation polymerization.
source：期刊
specific source：Polym. Chem. 1 (3), 289-295 (2010). DOI: 10.1039/b9py00230h
Issue time：2010年
Ellipsoidal tri-layer hematite/poly(N,N0-methylenebisacrylamide-co-methacrylic acid)/titania (Fe2O3/P(MBA-co-MAA)/TiO2) hybrid materials were prepared by a three-stage reaction process, which included the combination of the controlled hydrolysis of inorganic salt to afford ellipsoidal hematite core and titania shell layer and distillation precipitation copolymerization of N,N0-methylenebisacrylamide (MBA) and methacrylic acid (MAA) in acetonitrile for the formation of a P(MBA-co-MAA) sandwiched mid-layer. The corresponding hollow ellipsoidal hematite-sphere-intitania-spheres were afforded by selective removal of the sandwiched P(MBA-co-MAA) mid-layer via calcination. Hollow titania ellipsoids were further obtained by selectively etching the hematite core in aqueous hydrofluoric acid (HF) solution from the ellipsoidal hematite-sphere-in-titania-sphere. The
resultant ellipsoidal tri-layer Fe2O3/P(MBA-co-MAA)/TiO2 and the corresponding hollow ellipsoidal particles were confirmed by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy, X-ray diffraction (XRD), thermogravimetric (TGA) analysis and vibrating sample magnetometery (VSM).