Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 311, Issue 1, Pages 125-130Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2006.11.173
Keywords
hydrophilic; self-assembly; silica-coated; magnetic nanospheres; high saturation magnetization; streptavidin; bioapplication
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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 mu g/mg of the model biomolecule streptavidin (SA) could be bound covalently to the hydrophilic silica nanospheres. (C) 2006 Elsevier B.V. All rights reserved.
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