| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1643997 | Materials Letters | 2014 | 4 Pages |
•Heating characteristics and DC magnetization measurements were carried out for two different Fe3O4 nanoparticle arrangements.•Hysteresis heating was found to be responsible for dominant heating mechanism in AC field at 13.56 MHz.•The PAA coated single nanoparticle system was found to be more efficient heat source than the polystyrene (PS)/Fe3O4 based composites.•Dipole–dipole interaction was found responsible for the reduced magnetic hyperthermia effect.
A correlation between the DC magnetization and hyperthermia heating rate in high frequency magnetic fields was established for two distinctively different magnetic nanoparticle (MNP) systems: (1) polystyrene (PS)/Fe3O4 based composites, consisting of 10 nm diameter Fe3O4 nanoparticles embedded in the matrix of polystyrene (PS) spheres (~100 nm), and (2) similar Fe3O4 nanoparticles coated with polyacrylic acid (PAA) and dispersed in water. Due to physical confinement of Fe3O4 nanoparticles in the former, the PS/Fe3O4 composite exhibited much lower magnetic hyperthermia heating compared to the latter. The reduced magnetic hyperthermia heating in the polystyrene (PS)/Fe3O4 based composites was found to be associated with strong dipolar interactions.
