Abstract
Hollow mesoporous silica spheres with magnetite cores (HMSMC) have been fabricated by Vacuum Nano-casting Route. The amount of magnetite cores and saturation magnetization value can be easily adjusted by changing the concentration of iron nitrate solution used in the synthesis procedure. Furthermore, the as-prepared HMSMCs still maintain narrow mesopore distribution, high surface area and large pore volume after the hollow cores of hollow mesoporous silica spheres were filled with magnetite particles. Specially, when the saturation magnetization value of as-prepared HMSMCs reaches 22.0 emu/g, the surface area and pore volume of corresponding HMSMCs are 149 m2/g and 0.19 cm3/g, respectively, and the pore size is 2.30 nm. The corresponding samples are characterized by X-ray diffraction, N2 sorption isotherms, transmission electron microscopy and vibrating-sample magnetometer.
Highlights
A number of literatures have described the formation of hollow mesoporous spheres in the past few years [1,2,3,4,5,6,7,8], and it is generally accepted that hollow spheres with mesoporous shells will exhibit more advantages in mass diffusion and transportation compared with conventional hollow spheres of solid shells [4,8]
We use a new route to fabricate hollow mesoporous silica with magnetite cores (HMSMC) and the amount of magnetite cores can be adjusted by changing the concentration of iron nitrate solution used in the synthesis procedure
The powder was calcined at 773 K for 2 h to yield the hollow mesoporous silica spheres with hematite cores (HMSHC)
Summary
A number of literatures have described the formation of hollow mesoporous spheres in the past few years [1,2,3,4,5,6,7,8], and it is generally accepted that hollow spheres with mesoporous shells will exhibit more advantages in mass diffusion and transportation compared with conventional hollow spheres of solid shells [4,8]. Magnetic core/mesoporous silica shell structures were synthesized by sol-gel reaction on hematite particles followed by H2 reduction [16,17]. Hematite particles and magnetic nanocrystals were firstly synthesized, and were coated with mesoporous silica shell.
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