Highly-Ordered Hollow Nanochanneled-Silica Nanospheres Prepared Using Sacrificial Copolymer Nanospheres

초록

Monodisperse hollow mesoporous silica nanospheres were synthesized based on the cationic colloidal polymeric nanospheres. The nanospheres were prepared by the surfactant-free emulsion copolymerization of styrene and butyl acrylate in the presence of a cationic monomer, methacryloxyethyl trimethyl ammonium chloride using azobis(isobutylamidine hydrochloride) as an initiator. The charged polystyrene nanospheres were dispersed in water and mixed with cetyltrimethylammonium bromide and ammonium hydroxide in ethanol. Tetraethylorthosilicate as a negatively charged silica precursor was then added dropwise to achieve rapid hydrolysis onto the cationic surfaces of colloidal particles and allow mesoscopic ordering of the co-self-assembly of tetraethylorthosilicate and cetyltrimethylammonium bromide on the shell phase. The samples were then heated to 600°C to remove the colloidal template, resulting in monodisperse hollow mesoporous nanospheres. These nanospheres were characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction.