Magnetic and hyperthermia properties of CoxFe3-xO4 nanoparticles synthesized via cation exchange

Bacterially synthesized ferrite nanoparticles for magnetic hyperthermia applications.

Magnetic hyperthermia uses AC stimulation of magnetic nanoparticles to generate heat for cancer cell destruction. Whilst nanoparticles produced inside magnetotactic bacteria have shown amongst the highest reported heating to date, these particles are magnetically blocked so that strong heating occurs only for mobile particles, unless magnetic field parameters are far outside clinical limits. He...

Physically synthesized Ni-Cu nanoparticles for magnetic hyperthermia

BACKGROUND: In this paper, a physical method to prepare copper-nickel alloy particles in the sub-micron range for possible self controlled magnetic hyperthermia treatment of cancer is described. It is reported that an increase in tumor temperature decreases the tumor resistance to chemo- and radiation therapies. Self controlled heating at the tumor site to avoid spot heating is managed by contr...

Mössbauer characterisations and magnetic properties of iron cobaltites CoxFe3–xO4 (1 x 2.46) before and after spinodal decomposition

Iron cobaltite powders CoxFe3ÿxO4 (1rxr2.46) were synthesized with compositions in between the cobalt ferrite CoFe2O4 and Co2.46Fe0.54O4. The cationic distribution of pure spinel phases was determined by Mössbauer spectroscopy: as Co content increases in the spinel oxide, Co cations replace Fe cations in the octahedral sites and Co cations migrate from octahedral to tetrahedral sites. Saturatio...

Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3-xO4 nanoparticles

We report a systematic study on the structural and magnetic properties of CoxFe3-xO4 magnetic nanoparticles with sizes between 5 to 25 nm, prepared by thermal decomposition of Fe(acac)3 and Co(acac)2. The large magneto-crystalline anisotropy of the synthesized particles resulted in high blocking temperatures (42K< TB< 345K for 5 < d < 13 nm) and large coercive fields (HC ≈ 1600 kA/m for T = 5 K...

Effect of deviation from stoichiometric composition on structural and magnetic properties of cobalt ferrite, CoxFe3−xO4 (x = 0.2 to 1.0)