Fabrication of silica hollow spheres using a sacrificial template method assisted with spray drying process

Abstract

Core-shell composites of silica-coated MF microspheres were prepared by the hard template of MF microspheres whose surface were clad with silica colloid in a spray drying induced in-situ coating process.Furthermore, silica hollow spheres were obtained by removal of MF cores at calcinations in air.The influence of the concentration of the SiO 2 colloid and the ratio of MF microspheres to the core/shell composites and the hollow spheres on the composition, the morphology and size were studied with fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) .