Optimization of synthesis conditions to prepare desired shell thickness of superparamagnetic MgFe2O4@SiO2 core-shell nanosphere for biomedical applications
10th Annual TechConnect World Innovation Conference and Expo, Held Jointly with the 19th Annual Nanotech Conference and Expo, and the 2016 National SBIR/STTR Conference
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英文:
Washington
アブストラクト
We have described here a simple way for the fabrication of superparamagnetic MgFe2O4@SiO2 core-shell spherical nanoparticles with controlled shell thickness. First, core MgFe2O4 dense nanospheres were directly synthesized by ultrasonic spray pyrolysis (USP) technique from the aqueous metal nitrate precursor solution. Afterward, silica was coated on the obtained nanosphere for various desired shell thickness (10, 20 and 30 nm) by using theoretically calculated amount of tetraethyl orthosilicate (TEOS, as SiO2 precursor) and appropriate ratio of HCl (as acidic catalyst) via modified sol-gel approach. The effect of different shell thickness on the structural and morphological properties of core-shell nanospheres were detail studied by variuos characterization techniques. These results demonstrate that core-shell structure have only a single core MgFe2O which is homogeneously covered by dense amorphous silica layer with appropriate thickness. The measured shell thickness (∼ 10, 20 and 30 nm) by TEM image is almost same as our proposed shell thickness. TGA curves shows the better thermal stability of coated nanosphere and have shows higher monodispersibity for thin shell (∼ 10 nm) due to less agglomeration.
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