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8221309 
Journal Article 
树枝状介孔氧化硅核/壳复合微球的合成和表征 
Zuo, C; Chen, Y; Chen, A 
2018 
Chinese Journal of Materials Research 
32 
10 
791-800 
Chinese 
Core/shell structured composite microspheres of sSiO 2 /D-mSiO 2 composed of solid silica (sSiO 2 ) as core and dendritic mesoporous silica (D-mSiO 2 ) as shell were synthesized via an oil-water biphase stratification approach with cetyltrimethylammonium bromide (CTAB) as template, tetraethylorthosilicate (TEOS) as precursor, Triethanolamine (TEA) as catalyst and n-hexane as emulsion agent. The synthesized products were characterized by means of field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), X- ray diffractometer (XRD), and nitrogen adsorption/desorption measurements. As revealed by FESEM and TEM that there existed plenty of radiate-dendritic-like open meso-channels, which were perpendicular to the sSiO 2 sphere surface. The thicknesses of D-mSiO 2 shell could be controlled by adjusting the TEOS amount. Low-angle XRD analyses suggested that the mesochannles in the shells exhibit poor degree of order, and the average pore diameter was 7~9 nm. Moreover, the D-mSiO 2 shell thicknesses (5~60 nm) increased firstly and then decreased with the increase of stirring rate (50~500 r/min). Finally, the formation mechanism for the mesoporous shells with radiate- dendritic- like open meso-channels of composite microspheres was also discussed. © All right reserved. 
Composite microspheres; Core/shell structure; Dendritic mesoporous channels; Inorganic non-metallic materials; Mesoporous silica