Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1804166 | Journal of Magnetism and Magnetic Materials | 2007 | 6 Pages |
Abstract
Well-defined silica-magnetite core-shell nanospheres were prepared via a modified sol–gel method. Sphere-like magnetite aggregates were obtained as cores of the final nanospheres by assembling in the presence of Tween 20. Characterization by transmission electron microscopy (TEM) showed spherical morphology of the nanospheres with controlled silica shell thickness from 9 to 30 nm, depending on the amount of tetraethoxysilane (TEOS) used. The nanospheres contained up to 41.7 wt% magnetite with a saturation magnetization of 21.8 emu/g. Up to 35 μg/mg of the model biomolecule streptavidin (SA) could be bound covalently to the hydrophilic silica nanospheres.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Hong Xu, Naihu Tong, Longlan Cui, Ying Lu, Hongchen Gu,