1. Preparation of hydrophilic magnetic nanospheres with high saturation magnetization
- Author
-
Hong Xu, Naihu Tong, Hongchen Gu, Longlan Cui, and Ying Lu
- Subjects
chemistry.chemical_classification ,Streptavidin ,Materials science ,Biomolecule ,Nanoparticle ,Nanotechnology ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Magnetization ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Transmission electron microscopy ,Self-assembly ,Sol-gel ,Magnetite - 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.
- Published
- 2007