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Hollow mesoporous silica nanospheres with large pores have been synthesized by a newly developed green approach, and the highly dispersed hydrophobic magnetite nanoparticles were then loaded into hollow nanospheres through the large pores with a vacuum impregnation technique. The obtained Fe3O4-hollow mesoporous silica composites exhibit superparamagnetic property and ultra-fast immobilization speed...
In this paper, we prepared the magnetite nanoparticles coated with polyethlenimine, (CH2-CH2-NH)n with the coprecipitation method. X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) methods were used to analyze their phase and size; The groups adhered on the surface were observed by Fourier transform infrared spectroscopy(FTIR); adsorption rate of the PEI was got by thermogravimetric...
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