| 초록 |
Ferrites are important magnetic materials, which are widely used in many electronic and magnetic applications, such as in transformers, choke coils, high frequency application, data storage, noise filters, and recording heads, due to their high magnetic permeabilities and low magnetic losses. Recently, the magnetic carrier technology (MCT) was developed by using magnetic bead coated with bio-active materials for the selective extraction of biological components or delivery of medicine to intended body parts. The small sizes and single domain natures of the nanosized ferrite powders give them super paramagnetic properties. Nanosized NiFe2O4 powders were prepared in ethylene glycol solution under mild temperature and pressure conditions by precipitation from metal nitrates. The average size and distribution of the synthesized NiFe2O4 powders was about 15 ㎚ and narrow, respectively. The magnetic property of the synthesized NiFe2O4 powder was about 60 (emu/g) with superparamagnetic character at room temperature. |
