Cysteine-modified Fe3O4 nanoparticles (Cys-Fe 3O4 NPs) were synthesized by the one-pot biofunctionalization of allyl-functionalized Fe3O4 NPs (allyl-Fe3O4) with cysteine using the in situ hydrolysis-condensation of iron(III) allylacetylacetonate and the thiol-ene click reaction. The particle size of Fe3O4 in Cys-Fe 3O4 NPs measured by transmission electron microscopy and X-ray diffraction analysis was ∼8 nm. Cys-Fe3O4 NPs were soluble in water and had a hydrodynamic diameter of 22 nm and prolonged stability in water. They were superparamagnetic, which was confirmed by fitting the Langevin equation to the magnetization data, generated heat in an alternating current (AC) magnetic field, and had a specific absorption rate (SAR) of 156 W g-1 at 230 kHz and 100 Oe. In addition, they exhibited a T2-weighted magnetic resonance imaging (MRI) contrast-enhancing effect.
|Number of pages||5|
|Journal||Chemistry of Materials|
|Publication status||Published - Jun 22 2010|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Chemistry